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Orthopaedic Journal of Sports Medicine logoLink to Orthopaedic Journal of Sports Medicine
. 2021 May 7;9(5):23259671211002282. doi: 10.1177/23259671211002282

Supplementary Lateral Extra-articular Tenodesis for Residual Anterolateral Rotatory Instability in Patients Undergoing Single-Bundle Anterior Cruciate Ligament Reconstruction: A Meta-analysis of Randomized Controlled Trials

Yunhe Mao *, Kaibo Zhang *, Jian Li *, Weili Fu *,†
PMCID: PMC8113943  PMID: 33997075

Abstract

Background:

The combination of lateral extra-articular tenodesis (LET) with primary single-bundle anterior cruciate ligament (ACL) reconstruction (ACLR) remains controversial.

Purpose:

To determine whether the combination of LET with single-bundle ACLR provides greater control of anterolateral rotatory instability and improved clinical outcomes compared with ACLR alone.

Study Design:

Systematic review; Level of evidence, 2.

Methods:

PubMed, Embase, and the Cochrane Central Register of Controlled Trials databases were searched between inception and July 1, 2020. Level 1 or 2 randomized controlled trials that compared isolated single-bundle ACLR with combined LET with ACLR were included. Data were meta-analyzed for the primary outcome measure of knee stability and the secondary outcome measures of patient-reported outcome scores, return to sports, and graft failure. Dichotomous variables were presented as relative risks (RRs), and continuous variables were presented as mean differences (MDs) and standardized MDs (SMDs).

Results:

A total of 6 studies involving 1010 patients were included. Pooled data showed that the ACLR+LET group had a lower incidence of the pivot shift (RR, 0.56 [95% CI, 0.45 to 0.69]; P < .00001), a higher postoperative activity level (MD, 0.47 [95% CI, 0.15 to 0.78]; P = .004), and a lower risk of graft failure (RR, 0.35 [95% CI, 0.21 to 0.59]; P < .00001) than did the ACLR group. However, there were no statistically significant differences in primary outcomes including positive Lachman test findings (RR, 0.76 [95% CI, 0.48 to 1.21]; P = .26) or side-to-side differences (SMD, –0.43 [95% CI, –0.95 to 0.09]; P = .11) or in secondary outcomes including International Knee Documentation Committee scores (SMD, 0.25 [95% CI, –0.06 to 0.56]; P = .11) or Lysholm scores (SMD, 0.28 [95% CI, –0.06 to 0.62]; P = .11). Although the overall rate of return to sports was not significantly different between the groups (RR, 0.97 [95% CI, 0.90 to 1.03]; P = .33), the activity level was higher in the ACLR+LET group.

Conclusion:

The addition of LET to primary single-bundle ACLR produced greater knee stability, a higher activity level, and a lower incidence of graft failure than did ACLR alone. There may be a role for adding LET to ACLR for the treatment of ACL injuries.

Keywords: Knee, lateral extra-articular tenodesis, anterior cruciate ligament reconstruction, anterolateral rotatory instability, pivot shift

Intra-articular anterior cruciate ligament (ACL) reconstruction (ACLR) is considered an effective treatment for ACL injuries. Despite the rapid evolution of ACLR techniques, an increasing subset of patients has residual anterolateral rotatory instability (ALRI) postoperatively.17,35,39,44 Such instability is usually assessed using the pivot-shift test. Residual pivot shift after ACLR is negatively correlated with functional outcomes and results in a higher risk of meniscal and cartilage injuries, graft ruptures, and osteoarthritis.5,10,26,28,37

Before intra-articular ACLR became the primary treatment for an ACL-deficient knee, isolated lateral extra-articular tenodesis (LET) was used as a solution to rotational instability.6,15 This approach became popular in the 1980s and was adopted by a number of surgeons as concomitant augmentation in ACLR,9,53 but it then fell out of favor because of unsatisfactory clinical outcomes27,47 and was eventually superseded by intra-articular ACLR. However, with increasing failure rates after single-bundle ACLR and intractable cases of ALRI continuously reported in recent studies,30,31 LET has regained its favor as an additional procedure for potentially reducing the rate of reinjuries and residual instability after ACLR.

Several randomized controlled trials (RCTs) have compared the combination of LET and ACLR with isolated ACLR,1,4,8,18,19,45,46,51 but many of these trials contained relatively small cohorts and demonstrated inconsistent outcomes. For example, 1 multicenter RCT18 reported that the addition of LET to single-bundle ACLR with a hamstring tendon autograft results in a statistically significant, clinically relevant reduction in the risk of graft ruptures and persistent rotatory laxity. However, this conclusion was contradicted by several other RCTs.4,8,45 Another study8 indicated a risk of lateral compartment osteoarthritis after 19 years when LET was combined with ACLR, but 2 other European studies with follow-up periods of over 20 years did not demonstrate an increased rate of osteoarthritis development with the addition of LET.36,52

Several systematic reviews with meta-analyses have also attempted to address which treatment plan is most beneficial.12,21,43,48 These meta-analyses produced inconsistent conclusions, and the quality of the included RCTs was low and contained methodologic shortcomings, characterized by high heterogeneity and a lack of outcome indicators.

To our knowledge, no quantitative meta-analysis on overall clinical outcomes has been conducted. These gaps in the literature make it unclear whether LET during primary ACLR can reduce the risk of postoperative ALRI. Thus, we conducted a meta-analysis to evaluate whether LET combined with ACLR could improve overall knee function with regard to knee stability, patient-reported outcome scores, the incidence of graft failure, and the ability to return to sports.

Methods

Search Strategy and Inclusion Criteria

This meta-analysis was conducted according to the 2010 PRISMA (Preferred Reporting Items for Systematic Reviews and Meta-Analyses) guidelines.33 A systematic review of the literature was performed using the electronic databases of PubMed, Embase, and the Cochrane Central Register of Controlled Trials (CENTRAL) between inception and July 1, 2020. Two reviewers (Y.M. and K.Z.) independently searched each database using the following keywords: (“lateral extra-articular tenodesis” OR “lateral extra-articular procedure” OR “lateral augmentation procedures” OR “lateral extra-articular plasty” OR “lateral extra-articular sling”) AND (“knee”). The detailed search strategy is provided in the Appendix. A manual search of references from the included articles was also conducted to ensure the retrieval of articles on related topics.

Titles and abstracts were screened initially for relevance, and potentially eligible articles were read in their entirety. Disagreements on study selection were resolved through a discussion and consensus between the 2 reviewers. Only studies published in English were reviewed. The inclusion criteria were as follows: (1) level 1 or 2 prospective studies or RCTs that compared the combination of LET and ACLR with isolated ACLR; (2) single-bundle ACLR performed using autogenous grafts; (3) knee laxity measured using the pivot-shift test, Lachman test, and arthrometric side-to-side difference; (4) at least 1 postoperative patient-reported outcome score measured using either the International Knee Documentation Committee (IKDC) subjective score or Lysholm score; (5) rate of return to sports (return to preinjury levels) reported; (6) cases of graft failure or ruptures recorded; and (7) mean follow-up of at least 2 years. Studies were excluded if they involved any of the following: (1) ACLR performed using double-bundle techniques, (2) allogeneic or artificial grafts used for ACLR or LET, (3) patients with multiligament injuries, (4) concomitant surgery that affected knee function (eg, alignment knee surgery or fracture surgery), or (5) revision surgery. Biomechanical or animal studies as well as reviews were excluded.

Data Extraction

The same 2 reviewers independently extracted the following data from included studies: name of the first author, publication year, number of participants enrolled, mean age of participants, number of patients lost to follow-up, methods of randomization, methods of assessor/participant blinding, length of follow-up, ACLR technique, LET technique, and outcome measures. Disagreements on data extraction were resolved through a discussion. The primary outcome was knee stability, defined as follows: (1) positive knee ALRI (pivot-shift test grade ≥2), (2) positive anterior laxity (Lachman test grade ≥2), and (3) KT-1000/-2000 arthrometer side-to-side difference in anterior tibial translation between the injured and noninjured knees.

Secondary outcomes included patient-reported outcome scores: the IKDC subjective score, ranging from 0 (total limitation) to 100 (no limitations),24 and the Lysholm score, ranging from 0 (no function) to 100 (best function).7 The rate of return to sports was defined as the proportion of patients able to return to their preinjury sports of choice. Activity level was assessed at last follow-up using the Tegner scale, with 0 denoting disability and 10 denoting competitive sports,7 and the Marx scale, with 0 denoting exercise <1 time per month and 4 denoting exercise >4 times a week.32 Graft failure was defined as a postoperative rupture of the graft that was confirmed using either magnetic resonance imaging or an arthroscopic examination and required revision surgery.

Quality Assessment

Moreover, the 2 reviewers independently assessed the methodologic quality of the selected studies using the Cochrane Collaboration risk of bias tool,22 which comprises the following 7 items: random sequence generation (selection bias), allocation concealment (selection bias), blinding of participants and personnel (performance bias), blinding of outcome assessment (detection bias), incomplete outcome data (attrition bias), selective reporting (reporting bias), and other bias. Each of the included studies was rated as having a low, unclear, or high risk of bias. Disagreements were resolved through a discussion.

Statistical Analysis

Data analyses were performed using Review Manager Version 5.3 (Cochrane Collaboration). The relative risk (RR) and its corresponding 95% CI were calculated for dichotomous data including the pivot-shift test, Lachman test, and overall rate of return to sports. Standardized mean differences (SMDs) and 95% CIs were calculated for continuous variables of the IKDC subjective score, Lysholm score, and side-to-side difference. Activity levels were compared using mean differences (MDs) and 95% CIs. Heterogeneity across individual studies was assessed using the I 2 statistic, with I 2 >50% considered significant. If heterogeneity was significant, data were analyzed using a random-effects model; otherwise, a fixed-effects model was applied. Publication bias was not formally tested because the number of included studies was too small.

Results

Search Results

Our initial search of the online databases retrieved a total of 333 articles (Figure 1). After the screening and removal of duplicate articles, 125 remained. Titles and abstracts were reviewed, and the full text of 31 articles was examined. Ultimately, 6 RCTs4,8,18,45,46,51 were included in this review (Table 1).

Figure 1.

Figure 1.

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Flowchart of study search and selection. ACLR, anterior cruciate ligament reconstruction; RCT, randomized controlled trial.

Table 1.

Characteristics of Included Randomized Controlled Trialsa

Lead Author (Year) No. of Patients Patient Age,b y Surgical Technique Follow-up,b y Patients Lost to Follow-up, n (%)
ACLR LET
Getgood18 (2020) ACLR: 298; ACLR+LET: 291 ACLR: 18.8 (14-25); ACLR+LET: 19.1 (14-25) HA Modified Lemaire 2 29 (4.9)
Castoldi8 (2020) ACLR: 61; ACLR+LET: 60 Inclusion: 26.0 (15-40); last follow-up: 46.0 (35-59) BPTB Modified Lemaire 19.4 (19.0-20.2) 41 (33.9)
Trichine45 (2014) ACLR: 60; ACLR+LET: 60 ACLR: 27.7 (19-40); ACLR+LET: 28.6 (21-30) BPTB Modified Lemaire 1.9 (0.5-5.2) 13 (10.8)
Vadalà46 (2013) ACLR: 32; ACLR+LET: 28 ACLR: 28 (15-40); ACLR+LET: 26 (15-40) HA Modified Cocker-Arnold 3.7 (3.0-4.2) 5 (8.3)
Zaffagnini51 (2006) ACLR: 25; ACLR+LET: 25 ACLR: 31.3 (26-49); ACLR+LET: 26.7 (15-44) BPTB and HA “Over the top” 5 0 (0.0)
Anderson4 (2001) ACLR: 35; ACLR+LET: 35 ACLR: 20.1 (14-38); ACLR+LET: 22.0 (14-40) BPTB and HA Losee 2.9 (2.0-4.0) 3 (4.3)
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aACLR, anterior cruciate ligament reconstruction; BPTB, bone–patellar tendon–bone autograft; HA, hamstring tendon autograft; LET, lateral extra-articular tenodesis.

bData are shown as mean (range).

All studies reported on single-bundle ACLR using either a hamstring tendon autograft or bone–patellar tendon–bone (BPTB) autograft. Overall, 3 studies reported on LET using the modified Lemaire technique.8,18,45 The modified Cocker-Arnold technique46 and the Losee technique4 were reported by 1 study each.4,46 These 2 techniques are biomechanically similar to the modified Lemaire technique in which the lateral articular capsule is enhanced using an iliotibial band strip. One study51 incorporated the tails of hamstring tendon grafts for ACLR in an “over-the-top” technique; the graft was looped back and fixed at the end of the lateral condyle in the cortical bone of the femur, and then, the remaining part of the graft was fixed using a single staple in manual maximum tension to the Gerdy tubercle. The fixation points are similar to those used in the MacIntosh technique.3

Characteristics of Included Studies

A total of 1010 patients were included in our analysis. The inclusion criteria of patients were slightly different among studies but can be summarized as follows: (1) an isolated primary ACL rupture with no comorbidities other than meniscal injuries,4,8,18,45,46,51 (2) age younger than 40 to 50 years4,18,46,51 (very few participants [<5%] were over the age of 40-50), (3) the presence of a grade ≥2 pivot shift,18,45,46 and (4) cutting sports at a competitive or amateur level.18,46,51 There were no statistically significant differences in the proportion of participants with concomitant partial meniscectomy between the ACLR+LET and ACLR groups (RR, 0.89 [95% CI, 0.74-1.06]; P = .19) (Figure 2). A single study included only male patients,45 while another included only female patients.46 Furthermore, 2 studies compared 3 techniques: isolated ACLR with a BPTB autograft, isolated ACLR with a hamstring tendon autograft, and ACLR+LET with a hamstring tendon autograft.4,51 To minimize heterogeneity, only the data from the latter 2 groups were extracted.

Figure 2.

Figure 2.

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Forest plot comparing the rates of patients with concomitant partial meniscectomy between the ACLR and ACLR+LET groups. ACLR, anterior cruciate ligament reconstruction; LET, lateral extra-articular tenodesis; M-H, Mantel-Haenszel.  

Quality Assessment

Results from the quality assessment of included studies are summarized in Figure 3. One study8 was rated as having a high risk of selection bias because it reported unblinded block randomization for group allocation. Also, 2 studies46,51 reported that participants were allocated randomly but did not adequately describe the randomization method, thus resulting in an unclear risk of bias rating. All studies failed to clearly describe the blinding of patients regarding the surgery type. There were 3 studies8,18,46 rated as having a low risk of bias that mentioned the blinding methods used to measure outcome data: all participants wore a Tubigrip sleeve over the operative knee during functional testing to conceal the incisions, or an independent assessor completed clinical assessments. In contrast, the remaining studies were rated as having an unclear risk of bias because they provided insufficient data.

Figure 3.

Figure 3.

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Quality assessment of the included studies. (A) Graph of the risk of different types of bias. (B) Summary of bias risk. + = low risk of bias; − = high risk of bias; ? = unclear or unknown risk of bias.

One study8 lost more than 20% of enrolled patients during follow-up and was regarded as having a high risk of attribution bias. All studies reported the same outcome measures and were thus rated as having a low risk of reporting bias. Notably, a single study included only male patients,45 while another included only female patients,46 which resulted in a high risk of other bias.

Primary Outcomes

Knee Stability

Pivot-Shift Test

The pivot-shift test is purportedly the most specific measure of rotational instability of all clinical ACL tests.42 All studies4,8,18,45,46,51 in our meta-analysis reported postoperative pivot-shift test findings (Figure 4). Among the patients, 479 were treated using isolated single-bundle ACLR (with either a hamstring tendon or BPTB autograft), and 470 were treated using ACLR+LET. The pivot shift was dichotomized into positive (grades 2 or 3) or negative (grades 0 or 1) for meta-analysis. There was a 56% risk reduction for positive knee ALRI with ACLR+LET (RR, 0.56 [95% CI, 0.45-0.69]; P < .00001), and low heterogeneity was detected (I 2 = 13%; P = .33).

Figure 4.

Figure 4.

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Forest plot of the incidence of positive knee anterolateral rotatory instability in the ACLR and ACLR+LET groups. ACLR, anterior cruciate ligament reconstruction; LET, lateral extra-articular tenodesis; M-H, Mantel-Haenszel.

Lachman Test

Two-thirds of the studies reported Lachman test results.8,45,46,51 A total of 145 patients treated using ACLR+LET were compared to 147 patients treated using isolated ACLR (Figure 5). Lachman test results were dichotomized into positive (grades 2 and 3) or negative (grades 0 and 1) for meta-analysis. The results revealed no significant differences in terms of positive anterior laxity between the ACLR+LET and ACLR groups (RR, 0.76 [95% CI, 0.48-1.21]; P = .26). There was low to moderate heterogeneity among the studies (I 2 = 40%; P = .17).

Figure 5.

Figure 5.

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Forest plot of the incidence of positive anterior laxity in the ACLR and ACLR+LET groups. ACLR, anterior cruciate ligament reconstruction; LET, lateral extra-articular tenodesis; M-H, Mantel-Haenszel.

Side-to-Side Difference in Anterior Translation

Data on 818 patients, including 407 who underwent ACLR+LET and 411 who underwent ACLR, were pooled from 4 studies4,18,45,46 that reported the postoperative side-to-side difference as measured using a KT-1000/-2000 arthrometer (Figure 6). At last follow-up, this measurement was not significantly different between the 2 groups (SMD, –0.43 [95% CI, –0.95 to 0.09]; P = .11), although heterogeneity was high for this outcome (I 2 = 88%; P < .00001).

Figure 6.

Figure 6.

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Forest plot of the side-to-side difference between the ACLR and ACLR+LET groups. ACLR, anterior cruciate ligament reconstruction; IV, inverse variance; LET, lateral extra-articular tenodesis; Std, standardized.

Secondary Outcomes

Return to Sports

Overall Rate

Data on 470 patients treated using ACLR+LET and 478 treated using isolated ACLR were extracted from all 6 studies4,8,18,45,46,51 (Figure 7). The overall rates of return to sports, defined as the ability of patients to return to their primary sport of choice and their activity level before trauma, were evaluated at last follow-up. The data were dichotomized into “able to return” or “not able to return” for meta-analysis. No differences in overall rates of return to sports were found (RR, 0.97 [95% CI, 0.90-1.03]; P = .33), and no heterogeneity was detected (I 2 = 0%; P = .56).

Figure 7.

Figure 7.

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Forest plot of the overall rate of return to sports in the ACLR and ACLR+LET groups. ACLR, anterior cruciate ligament reconstruction; LET, lateral extra-articular tenodesis; M-H, Mantel-Haenszel.

Activity Level

The Tegner scale and Marx scale are validated scoring systems to measure patient-reported activity levels.7,32 Data on 761 patients were pooled from 4 studies4,18,46,51 (Figure 8). Patients treated using ACLR+LET had significantly higher postoperative activity levels compared with patients who underwent ACLR (MD, 0.47 [95% CI, 0.15-0.78]; P = .004), with moderate to high heterogeneity among the studies (I 2 = 70%; P = .02).

Figure 8.

Figure 8.

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Forest plot comparing activity levels at last follow-up between the ACLR and ACLR+LET groups. ACLR, anterior cruciate ligament reconstruction; IV, inverse variance; LET, lateral extra-articular tenodesis.

Patient-Reported Outcome Scores

IKDC Score

All 6 studies4,8,18,45,46,51 reported postoperative scores on the IKDC subjective evaluation form, but 1 study4 was excluded from the meta-analysis of IKDC scores because it used the 1994 version rather than the most recent 2000 version. While 1 study51 reported significantly higher IKDC scores for the ACLR+LET group than for the ACLR group, our meta-analysis revealed no significant differences (SMD, 0.25 [95% CI, –0.06 to 0.56]; P = .11) (Figure 9). Moderate to high heterogeneity was observed for this outcome (I 2 = 68%; P = .01).

Figure 9.

Figure 9.

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Forest plot comparing postoperative International Knee Documentation Committee scores (based on the 2000 subjective evaluation form) between the ACLR and ACLR+LET groups. ACLR, anterior cruciate ligament reconstruction; IV, inverse variance; LET, lateral extra-articular tenodesis; Std, standardized.

Lysholm Score

The Lysholm score is effective for evaluating overall knee function, but only 2 studies8,46 reported postoperative Lysholm scores. No statistically significant differences were detected between the ACLR+LET group (n = 65) and ACLR group (n = 70) (SMD, 0.28 [95% CI, –0.06 to 0.62]; P = .11), and no heterogeneity was observed for this outcome (I 2 = 0%; P = .83) (Figure 10).

Figure 10.

Figure 10.

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Forest plot comparing postoperative Lysholm scores between the ACLR and ACLR+LET groups. ACLR, anterior cruciate ligament reconstruction; IV, inverse variance; LET, lateral extra-articular tenodesis; Std, standardized.

Graft Failure

Data on 799 patients, including 392 who underwent ACLR+LET and 407 who underwent ACLR, were pooled from 4 studies.4,8,18,46 The data were dichotomized into “confirmed graft rupture” or “no graft rupture” for meta-analysis. Patients treated using ACLR+LET had a significantly lower risk of postoperative graft failure compared with patients who underwent ACLR (RR, 0.35 [95% CI, 0.21-0.59]; P < .00001) (Figure 11), and no heterogeneity was detected (I 2 = 0%; P = .90).

Figure 11.

Figure 11.

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Forest plot of graft failure between the ACLR and ACLR+LET groups. ACLR, anterior cruciate ligament reconstruction; LET, lateral extra-articular tenodesis; M-H, Mantel-Haenszel.

Sensitivity Analysis

Given the potential for heterogeneity across studies because of patient and method differences, including the use of different LET techniques (iliotibial band graft or continuous hamstring tendon graft), we repeated the meta-analyses after excluding certain studies. The results were similar to those of the original meta-analyses (data not shown). In addition, as the number of included studies was relatively small, the random-effects model may not have been reliable. Therefore, all meta-analyses initially performed using a random-effects model were repeated using the fixed-effects model. Again, the results were similar to those of the original meta-analyses (data not shown).

Discussion

To determine differences in knee stability after the treatment of injured ACLs using ACLR+LET or ACLR alone, we performed a meta-analysis including 6 RCTs involving 1010 patients who were followed up for at least 24 months after surgery. We found that adding LET to ACLR provided no additional anterior knee stability compared with using ACLR alone based on the Lachman test or arthrometer testing. However, the addition of LET did reduce the incidence of the pivot shift and postoperative graft failure. While the addition of LET did not increase the overall rate of return to preinjury sports, it was associated with higher postoperative activity levels. Patient-reported outcome scores did not differ significantly between the ACLR and ACLR+LET groups.

The findings of our meta-analysis are consistent with those from several prospective controlled cohort studies.11,41,49 For example, a controlled cohort study41 of 277 patients treated using single-bundle ACLR with or without extra-articular augmentation using an iliotibial band also reported a significantly lower pivot shift at 2-year follow-up in the group that underwent tenodesis. Another study11 observed superior correction of the pivot shift in patients who underwent single-bundle ACLR using BPTB autografts in addition to modified Lemaire extra-articular tenodesis compared with in patients who underwent ACLR alone. We conclude that combining single-bundle ACLR with LET can further reduce the risk of postoperative ALRI in the long term (>2 years).

LET is aimed at restoring stability of the injured anterolateral complex including the anterolateral ligament, lateral capsule, and lateral collateral ligament, which together act as a secondary restraint to internal rotation of the tibia.29,38,40 Therefore, we were not surprised to find that LET did not affect anterior laxity of the knee in patients undergoing ACLR, as measured using the Lachman test or in terms of the side-to-side difference. Consistent with our findings, several biomechanical studies13,16,20,25 not included in this meta-analysis have reported no significant differences in anterior tibial translation of ACL-reconstructed knees between patients who underwent LET and those who did not.

Although adding LET to ACLR did not significantly increase the rate of return to sports in our meta-analysis, it did appear to increase the activity level during sports. There were 2 included studies18,46 that reported that the addition of LET enabled a larger subset of patients to return to strenuous, high pivot-shift sports such as skiing, soccer, and football. In fact, 1 study2 reported that the addition of LET led to postoperative activity levels that were similar to preinjury levels. Regardless of whether these discrepancies from our meta-analysis are genuine, the literature supports adding LET to ACLR for athletes in demanding sports.

We and others did not detect differences in the IKDC subjective score or Lysholm score between patients who underwent ACLR and those who underwent ACLR+LET.2,11,49 Both scoring systems have been carefully validated to assess patient knee function,7,14,23 but items assessing quality of life contribute only 10% to the overall IKDC score and only 5% to the overall Lysholm score. In fact, the IKDC score fails to reflect differences in quality of life after ACLR because of, for example, differences in postoperative activity levels.50 Therefore, a more disease-specific measurement with better structural validity, such as the ACL Quality of Life Questionnaire,34 may be needed. IKDC subjective scores and Lysholm scores may not be sufficient for comprehensively assessing outcomes after the addition of LET or other ACLR modifications.

The results from our meta-analysis are strengthened by the fact that we performed a comprehensive review of level 1 evidence with strict inclusion criteria. In addition, this study included 2 new, high-quality RCTs and a larger sample than a similar previous meta-analysis included.12,21 This, together with our sensitivity analysis, supports the robustness of our conclusions.

Despite these advantages, our meta-analysis has several limitations. First, the number of included studies was yet still small. Second, the follow-up duration varied widely from 2 to 19 years, which may have contributed to heterogeneity. Third, patients across the studies varied in their baseline characteristics, including age, sex, and family history, all of which are regarded as risk factors for residual ALRI. Fourth, surgical methods differed across the studies, which can affect outcomes. Other limitations may include the following: >50% of patients in this meta-analysis came from a single study,18 we could not assess other anterolateral ligament procedures, there were no data on long-term results, and there were limited data on LET using BPTB grafts. Further RCTs with larger sample sizes and longer follow-ups (>10 years) are required to ascertain the necessity of adding LET to ACLR.

Conclusion

The addition of LET to single-bundle ACLR appeared to be associated with a statistically significant, clinically relevant reduction in postoperative ALRI in the long term (>2 years) relative to ACLR alone. The adoption of LET may also lead to higher postoperative activity levels and a lower incidence of graft failure. For these reasons, the LET procedure should be considered in combination with isolated single-bundle ACLR, particularly in patients involved in strenuous sports.

APPENDIX

Search Strategy of PubMed Databasea

Search string:

((((((Lateral Extra-articular Tenodesis) OR (Lateral Extra-articular procedure)) OR (Lateral Augmentation Procedures)) OR (Lateral Extra-articular Plasty)) OR (Lateral Extra-articular sling) AND (Knee) Sort by: Most Recent

((((((((((((((((((((((((“functional laterality”[MeSH Terms] OR (“functional”[All Fields] AND “laterality”[All Fields])) OR “functional laterality”[All Fields]) OR “laterality”[All Fields]) OR “lateral”[All Fields]) OR “lateralisation”[All Fields]) OR “lateralisations”[All Fields]) OR “lateralise”[All Fields]) OR “lateralised”[All Fields]) OR “lateralises”[All Fields]) OR “lateralising”[All Fields]) OR “lateralities”[All Fields]) OR “lateralization”[All Fields]) OR “lateralizations”[All Fields]) OR “lateralize”[All Fields]) OR “lateralized”[All Fields]) OR “lateralizes”[All Fields]) OR “lateralizing”[All Fields]) OR “laterally”[All Fields]) OR “laterals”[All Fields]) AND “Extra-articular”[All Fields] AND ((((“tenodesed”[All Fields] OR “tenodesing”[All Fields]) OR “tenodesis”[MeSH Terms]) OR “tenodesis”[All Fields]) OR “tenodeses”[All Fields])) OR ((((((((((((((((((((“functional laterality”[MeSH Terms] OR (“functional”[All Fields] AND “laterality”[All Fields])) OR “functional laterality”[All Fields]) OR “laterality”[All Fields]) OR “lateral”[All Fields]) OR “lateralisation”[All Fields]) OR “lateralisations”[All Fields]) OR “lateralise”[All Fields]) OR “lateralised”[All Fields]) OR “lateralises”[All Fields]) OR “lateralising”[All Fields]) OR “lateralities”[All Fields]) OR “lateralization”[All Fields]) OR “lateralizations”[All Fields]) OR “lateralize”[All Fields]) OR “lateralized”[All Fields]) OR “lateralizes”[All Fields]) OR “lateralizing”[All Fields]) OR “laterally”[All Fields]) OR “laterals”[All Fields]) AND “Extra-articular”[All Fields] AND (((((((“methods”[MeSH Terms] OR “methods”[All Fields]) OR “procedure”[All Fields]) OR “methods”[MeSH Subheading]) OR “procedures”[All Fields]) OR “procedural”[All Fields]) OR “procedurally”[All Fields]) OR “procedure s”[All Fields]))) OR ((((((((((((((((((((“functional laterality”[MeSH Terms] OR (“functional”[All Fields] AND “laterality”[All Fields])) OR “functional laterality”[All Fields]) OR “laterality”[All Fields]) OR “lateral”[All Fields]) OR “lateralisation”[All Fields]) OR “lateralisations”[All Fields]) OR “lateralise”[All Fields]) OR “lateralised”[All Fields]) OR “lateralises”[All Fields]) OR “lateralising”[All Fields]) OR “lateralities”[All Fields]) OR “lateralization”[All Fields]) OR “lateralizations”[All Fields]) OR “lateralize”[All Fields]) OR “lateralized”[All Fields]) OR “lateralizes”[All Fields]) OR “lateralizing”[All Fields]) OR “laterally”[All Fields]) OR “laterals”[All Fields]) AND (((((“augment”[All Fields] OR “augmentation”[All Fields]) OR “augmentations”[All Fields]) OR “augmented”[All Fields]) OR “augmenting”[All Fields]) OR “augments”[All Fields]) AND (((((((“methods”[MeSH Terms] OR “methods”[All Fields]) OR “procedure”[All Fields]) OR “methods”[MeSH Subheading]) OR “procedures”[All Fields]) OR “procedural”[All Fields]) OR “procedurally”[All Fields]) OR “procedure s”[All Fields]))) OR ((((((((((((((((((((“functional laterality”[MeSH Terms] OR (“functional”[All Fields] AND “laterality”[All Fields])) OR “functional laterality”[All Fields]) OR “laterality”[All Fields]) OR “lateral”[All Fields]) OR “lateralisation”[All Fields]) OR “lateralisations”[All Fields]) OR “lateralise”[All Fields]) OR “lateralised”[All Fields]) OR “lateralises”[All Fields]) OR “lateralising”[All Fields]) OR “lateralities”[All Fields]) OR “lateralization”[All Fields]) OR “lateralizations”[All Fields]) OR “lateralize”[All Fields]) OR “lateralized”[All Fields]) OR “lateralizes”[All Fields]) OR “lateralizing”[All Fields]) OR “laterally”[All Fields]) OR “laterals”[All Fields]) AND “Extra-articular”[All Fields] AND (“plasties”[All Fields] OR “plasty”[All Fields]))) OR ((((((((((((((((((((“functional laterality”[MeSH Terms] OR (“functional”[All Fields] AND “laterality”[All Fields])) OR “functional laterality”[All Fields]) OR “laterality”[All Fields]) OR “lateral”[All Fields]) OR “lateralisation”[All Fields]) OR “lateralisations”[All Fields]) OR “lateralise”[All Fields]) OR “lateralised”[All Fields]) OR “lateralises”[All Fields]) OR “lateralising”[All Fields]) OR “lateralities”[All Fields]) OR “lateralization”[All Fields]) OR “lateralizations”[All Fields]) OR “lateralize”[All Fields]) OR “lateralized”[All Fields]) OR “lateralizes”[All Fields]) OR “lateralizing”[All Fields]) OR “laterally”[All Fields]) OR “laterals”[All Fields]) AND “Extra-articular”[All Fields] AND (“sling”[All Fields] OR “slings”[All Fields]))) AND ((((“knee”[MeSH Terms] OR “knee”[All Fields]) OR “knee joint”[MeSH Terms]) OR (“knee”[All Fields] AND “joint”[All Fields])) OR “knee joint”[All Fields])

aMeSH, Medical Subject Headings.

Footnotes

Final revision submitted December 3, 2020; accepted January 5, 2021.

The authors declared that there are no conflicts of interest in the authorship and publication of this contribution. AOSSM checks author disclosures against the Open Payments Database (OPD). AOSSM has not conducted an independent investigation on the OPD and disclaims any liability or responsibility relating thereto.

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