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. 2011 Jun 3;35(12):1805–1812. doi: 10.1007/s00264-011-1284-9

Hemi-Castaing ligamentoplasty for the treatment of chronic lateral ankle instability: a retrospective assessment of outcome

Tim Schepers 1,✉, Lucas M M Vogels 1, Esther M M Van Lieshout 1
PMCID: PMC3224610  PMID: 21637958

Abstract

Purpose

In the treatment of chronic ankle instability, most non-anatomical reconstructions use the peroneus brevis tendon. This, however, sacrifices the natural ankle stabilising properties of the peroneus brevis muscle. The aim of this study was to evaluate the functional outcome of patients treated with a hemi-Castaing procedure, which uses only half the peroneus brevis tendon.

Methods

We performed a retrospective cohort study of patients who underwent hemi-Castaing ligamentoplasty for chronic lateral ankle instability between 1993 and 2010, with a minimum of one year follow-up. Patients were sent a postal questionnaire comprising five validated outcome measures: Olerud-Molander Ankle Score (OMAS), Karlsson Ankle Functional Score (KAFS), Tegner Activity Level Score (pre-injury, prior to surgery, at follow-up), visual analog scale on pain (VAS) and the Short Form 36 (SF-36).

Results

Twenty patients completed the questionnaire on functional outcome. The OMAS showed good to excellent outcome in 80% and the KAFS in 65%, the Tegner Score improved from surgery but did not reach pre-injury levels, the VAS on pain was 1 of 10 and the SF-36 returned to normal compared with the average population.

Conclusions

Even though most patients were satisfied with the results, outcome at long-term follow-up was less favourable compared with the literature on anatomical reconstructions. In accordance with the literature, we therefore conclude that the initial surgical treatment of chronic lateral ankle instability should be an anatomical repair with augmentation (i.e. the Broström-Gould technique) and the non-anatomical repair should be reserved for unsuccessful cases after anatomical repair or in cases where no adequate ligament remnants are available for reconstruction.

Introduction

It has been estimated that more than 80 techniques exist for the treatment of lateral ankle instability [16, 18]. One of the earliest ideas was to prevent chronic instability from happening by early suturing of the acutely ruptured ligaments; currently, this management strategy is no longer in use [26]. Nowadays, most agree to perform surgery in the 15–40% of patients with recurrent instability who are hampered in daily or sporting activities [4, 7, 37].

Overall the surgical treatment modalities for recurrent or chronic lateral ankle instability are divided into (1) direct anatomical repairs (ligament suturing), (2) non-anatomical (tendon rerouting procedures without suturing native ligaments) and (3) augmented anatomical procedures (combination of procedures) [18, 51]. Recommendations from a recent review were to perform a direct repair with or without augmentation as the primary intervention and save ligamentoplasty as a secondary procedure [34]. However, those favouring a ligamentoplasty claim more stability compared with an anatomical repair and frequently no adequate ligamentous structures are available for a direct repair [13, 18]. The peroneus brevis is the most frequently used tendon for a tenodesis in the treatment of lateral ankle instability [17]. In 1984, Castaing described a ligamentoplasty technique for the treatment of chronic lateral ankle instability, using the entire peroneus brevis tendon [9, 21]. Later it was shown that using a split tendon provides better overall results compared with the use of the entire tendon [34]. The hemi-Castaing procedure is a form of split peroneus tendon tenodesis, which has been infrequently reported in the literature [33, 34, 47]. The benefit of a hemi-Castaing is the preservation of the natural ankle stabilising properties of the peroneus brevis muscle.

The primary objective of this study was to determine the long-term functional outcome in patients who underwent a hemi-Castaing ligamentoplasty for chronic lateral instability of the ankle.

Patients and method

This study is a retrospective cohort study in adult patients (age 18 years or over) who underwent hemi-Castaing ligamentoplasty for the treatment of chronic lateral ankle instability. All patients were treated between the years 1993 and 2010. Only patients with a minimum of one year follow-up were included. Since 1993, the hemi-Castaing ligamentoplasty has been the favoured operative treatment for these injuries in our department. Chronic lateral ankle instability was defined as recurrent ankle sprains, instability, and ‘giving way’ for at least six months after conservative treatment of an ankle inversion trauma. Physical examination included the anterior drawer test and the inversion or talar tilt test to assess the integrity of the anterior talofibular ligament (ATFL) and the calcaneofibular ligament (CFL). Stress radiographs taken with the Telos device, or magnetic resonance imaging (MRI), were performed only when deemed necessary. The local Medical Ethics Board approved the study, and informed consent was obtained from all patients.

Surgical technique

All operations were performed by or under the supervision of the same surgeon. The principle of most non-anatomical ligamentoplasties is to use the tendon of the peroneus brevis muscle. Due to its position and inherent strength of its distal anchor point, this complete tendon is used to strengthen the lateral ankle joint in the ligamentoplasty initially described by Castaing et al. [9]. The modification used in this study of this tenodesis, named the hemi-Castaing or Castaing II, makes use of half the peroneus brevis tendon. Hemi-Castaing ligamentoplasty begins with an incision over the lateral ankle, exposing the lateral malleolus and tendon of the peroneus brevis muscle (Fig. 1a), approximately 15 cm from its point of insertion. The tendon is hemi-sected proximally for half of its diameter and then split over the length of the tendon to the level of the most distal point of the fibula, releasing an 8-cm cord of tendon, free proximally, but remaining firmly anchored at its point of insertion at the base of the fifth metatarsal, the so-called hemi-tendon (Fig. 1b). A hole is then drilled through the distal part of the lateral malleolus, forming a tunnel. The direction of the tunnel runs between the directions of the ATFL and CFL (Fig. 1c). The hemi-tendon is passed through the tunnel from back to front and sutured to itself distally. The foot is maintained in a neutral anatomical position while the sutures are progressively tightened until optimal tensioning is reached (Figs. 1d and 2) [9]. Postoperatively patients are kept in non-weight-bearing plaster for two weeks and weight-bearing plaster for six weeks.

Fig. 1.

Fig. 1

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Hemi-Castaing surgical procedure. Details on the operation are given in the “Surgical technique” section

Fig. 2.

Fig. 2

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MRI view of ankle following hemi-Castaing procedure. Distal fibula with peroneus brevis loop: a T1-weighted image, b T2-weighted image

Outcome assessment

Patients were sent a postal questionnaire comprising five validated outcome measures. Intrinsic, injury- and intervention-related variables as well as data on intra- and postoperative complications and secondary interventions were taken from the (electronic) patient files.

The primary outcome measure was the Olerud-Molander Ankle Score (OMAS), which is a validated, self-administered questionnaire [41]. The scale is a functional rating scale from 0 (totally impaired) to 100 (completely unimpaired) and is based upon nine different items: pain, stiffness, swelling, stair climbing, running, jumping, squatting, supports and activities of daily living [41]. The OMAS has been frequently used to evaluate subjectively scored function after chronic ankle instability treatment. Outcome was categorised into four groups: excellent (91–100 points), good (61–90 points), fair (31–60 points) or poor (0–30 points).

Secondary outcome measures were the Karlsson Ankle Functional Score (KAFS), the Tegner Activity Level Score pre- and post-injury, pain and quality of life. The KAFS is a validated disease-specific measure that was developed for individuals who have sustained a lateral ankle injury [25]. This scale contains eight items covering content related to instability, pain, swelling, stiffness, functional activities (i.e. stair climbing, running and work activities) and need for support. Values for each of these items are summed, with a higher score representing a higher level of function. Results are classified with four different outcomes: outcome was categorised into four groups: excellent (90–100 points), good (80–89 points), fair (60–79 points) or poor (≤60 points) [25].

The Tegner Activity Level Score was designed as a score of activity level to complement other functional scores for patients with ligamentous injuries [50]. The instrument scores a person’s activity level between 0 and 10 where 0 is ‘on sick leave/disability’ and 10 is ‘participation in competitive sports such as soccer at a national or international elite level’. It is the most widely used activity scoring system for patients with ankle disorders. The score has been validated for use in patients with ankle instability [50].

Pain level on both sides was determined using a 10-point visual analog scale (VAS), in which 0 implied no pain and 10 implied the worst possible pain.

The Short Form 36 (SF-36) is a validated multipurpose, short-form health survey with 36 questions, representing eight health domains that are combined into a physical and a mental component scale [53]. Scores ranging from 0 to 100 points are derived for each domain, with lower scores indicating poorer function. These scores were converted to a norm-based score and compared with the norms for the general population of the USA (1998; Dutch norm-based scores are not available), in which each scale was scored to have the same average (50 points) and the same standard deviation (10 points).

Statistical analysis

Data were analysed using the Statistical Package for the Social Sciences (SPSS) version 16.0 (SPSS, Chicago, IL, USA). Normality of continuous data was tested with the Shapiro-Wilk test. Descriptive analysis was performed in order to describe baseline characteristics (intrinsic, injury- and intervention-related variables) and outcome measures. For continuous data the mean ± SD (parametric data) or medians and percentiles (non-parametric data) were calculated. For categoric data percentages were calculated. A multivariable linear regression analysis was performed in order to model the relation between different covariates and the OMAS score. Intrinsic, injury- and intervention-related variables were added as covariates. Similar models were made to model the relation between covariates and the other numeric outcome measures.

Results

Between January 1993 and March 2010 a total of 26 patients were treated for 30 chronically unstable ankles with the hemi-Castaing technique. Of the 26 patients, one died approximately two years after surgery from an unrelated cause and five patients were lost to follow-up due to unknown addresses, leaving 20 patients available at follow-up (Table 1).

Table 1.

Patient characteristics and outcome data of patients treated using a hemi-Castaing

Patient Gender Age FU (months) Side OMAS KAFS Tegner pre-injury Tegner preoperative Tegner FU SF-36 VAS Stiffness
1 M 35 80 L 100 100 10 10 8 109 1.0 No
2 F 39 26 R 100 100 7 6 3 118 0.0 No
3 F 25 89 L 90 100 10 1 7 116 0.0 No
4 M 38 98 R 100 95 8 1 6 117 0.0 No
5 F 39 73 L 95 95 1 0 1 118 0.0 No
6 M 22 214 R 100 100 5 2 5 118 0.0 No
7 M 53 15 B 90 100 3 3 3 119 0.0 No
8 M 23 97 L 90 87 9 9 7 97 0.0 Yes
9 M 35 81 L 85 79 9 2 5 110 4.0 Yes
10 F 29 190 R 80 82 3 1 3 116 0.0 Yes
11 M 43 187 R 95 85 4 1 4 116 0.0 No
12 F 20 196 L 100 95 6 4 5 117 0.0 No
13 M 20 121 L 85 89 8 10 9 106 1.9 Yes
14 M 24 137 L 80 60 6 4 1 108 3.8 Yes
15 F 43 42 R 100 100 9 1 4 102 1.4 No
16 F 18 74 R 60 49 8 8 3 101 5.8 Yes
17 M 27 180 L 60 39 7 1 2 100 4.0 Yes
18 F 44 76 R 70 64 7 7 1 103 6.0 Yes
19 M 38 207 L 50 49 10 10 8 105 4.6 Yes
20 M 63 10 L 45 20 2 2 2 89 7.0 Yes
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FU follow-up, L left, R right, OMAS Olerud-Molander Ankle Score, KAFS Karlsson Ankle Function Score, SF-36 Short Form 36, VAS visual analog scale

There were 12 male and eight female patients. The median age at surgery was 35.1 years (P25–P75 23.4–42.1). The right side was affected eight times, the left 11 times and one patient had bilateral treatment. The average duration of complaints before surgery was 28.3 ± 12.0 SEM months, and the average number of recurrent sprains per month prior to the operation was 36 ± 20 SEM. Two patients had mild arthritic changes at the ankle joint prior to surgery. Eleven patients (55%) were smokers at the time of the operation. One patient had undergone a Broström procedure prior to the hemi-Castaing ligamentoplasty and one patient had a loose body removed from the ankle joint at the time of the ligamentoplasty.

The median duration of follow-up was 92.9 months (P25–P75 73.5–185.0) and the median age at follow-up was 42.0 years (P25–P75 35.8–49.6). One patient suffered from a re-rupture after significant supination trauma and had a second Hemi-Castaing using the remainder of the peroneus brevis tendon almost three years after the index operation. Two patients had an arthroscopy to remove a loose body.

The median OMAS was 90 points (P25–P75 73–100) and 80% achieved a good or excellent outcome. The median KAFS was 88 points (P25–P75 61–100), with 65% achieving a good or excellent outcome. The VAS for pain was 1 (P25–P75 0–4), compared with 0 for the contralateral side. None of these three outcome scores was significantly influenced by age, duration of follow-up, gender, side, smoking or arthrosis. The Spearman rank test showed a strong correlation between the OMAS, KAFS, VAS, Physical Component Scale (PCS) and SF-36 total score (p < 0.001). The Mental Component Scale (MCS) did not correlate with any of the other scores.

The median Tegner Score before complaints, before surgery and currently were 7 (P25–P75 4–9), 3 (P25–P75 1–8) and 4 (P25–P75 2–7), respectively. Considering the SF-36 the PCS was 54.2 (P25–P75 45.7–57.2), the MCS was 59.4 (P25–P75 54.2–62.1) and the total SF-36 score reached 109.5 (P25–P75 102.1–117.1). For all eight domains of the SF-36 score, the median score was slightly higher than the normalised population score of 50 points (Fig. 3). Considering instability at follow-up, three patients (15%) reported using a brace or tape on some occasions (patients 16, 17 and 18). One patient (case 20), whose radiographs already showed arthrosis at the ankle joint prior to the hemi-Castaing, scored poor on all outcome scores and was offered a tibiotalar arthrodesis.

Fig. 3.

Fig. 3

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Norm-based SF-36 physical and mental component scores. The PCS combines the health domains physical functioning (PF), role limitations due to physical health (RP), bodily pain (BP) and general health perceptions (GH). The MCS combines the health domains vitality, energy, or fatigue (VT), social functioning (SF), role limitations due to emotional problems (RE) and general mental health (MH)

Discussion

Data on outcome after the surgical treatment of chronic lateral ankle instability using the hemi-Castaing procedure are scarce. In this study, at a mean follow-up of 7.74 years, a good to excellent outcome was obtained in 65% with the KAFS to 80% using the OMAS.

The median OMAS was 90 points. Muijs et al. applied the OMAS in 24 patients treated with a Duquennoy procedure, with a follow-up of 13 years, reaching an average score of 82 points and 81% good to excellent outcome [37]. Ibrahim et al. treated 14 patients with an anatomical gracilis plasty and found an OMAS of 88 after almost three years follow-up. In our study the median KAFS was 88 points with 65% reaching a good or excellent outcome. In the literature on non-anatomical reconstructions, median KAFS scores between 67 and 95 points have been published [28, 30, 49, 54]. Good to excellent outcome varies from 33 to 100% in recent studies with peroneus brevis ligamentoplasty and a minimum of five years follow-up [27, 28, 30, 34, 39]. It is noteworthy that the highest outcome scores are obtained in the smallest groups [49, 54].

No outcome data for the Tegner Score in the hemi-Castaing procedure are available. Morelli et al. reported a Tegner Score of 6.8 pre-surgery and 5.1 after a modified Watson-Jones procedure [36]. This post-surgery score was slightly higher than the Tegner Score of 4 which was found in our study. Patients apparently benefit from surgery compared with the pre-score; however they do not reach their pre-injury level of activity.

Considering the SF-36 the PCS was 54.2 (P25–P75 45.7–57.2), the MCS was 59.4 (P25–P75 54.2–62.1) and the total SF-36 score reached 109.5 (P25–P75 102.1–117.1). Different notations for the SF-36, applied by Muijs et al. and by Brodsky et al., make comparisons for the quality of life impossible.

The original Castaing procedure has been described only a few times in PubMed. In the large mixed series by Mabit et al. an unknown number of patients was treated with the original Castaing procedure [34]. In this study patients obtained a good to excellent outcome in approximately 70%, which was the poorest outcome of the four groups of reconstructions [34]. This less favourable outcome might be due to a decrease in eversion strength of 8–9% [43], because the peroneus brevis is one of the stabilisers of the ankle and subtalar joint. Three other series using the Castaing procedure could be identified. In the study by Cañadell et al. 13 patients were followed up for an average of 2.4 years with 92% of the patients willing to undergo the same surgery again [8]. Jarde et al. reviewed 46 patients with an average follow-up of 5.7 years, which obtained a good to excellent outcome in 82% using the American Orthopaedic Foot and Ankle Society (AOFAS) score [22].

Only a single abstract on ten patients with an unknown duration of follow-up [47], one Italian study on 20 patients with four years follow-up [33] and one series with an unknown number of patients with a mean follow-up of 13 years [34] could be identified in the literature in which the hemi-Castaing was applied. The outcome ranged from an average of 80 points on the AOFAS score [47] and 90% good to excellent outcome on the AOFAS score [33] to 92.2% good to excellent outcome on the KAFS [34].

Compared with the anatomical reconstruction our long-term follow-up functional outcome results appear lower. This might be due to worse range of motion in the non-anatomical repair, with half of our patients subjectively complaining of some stiffness in the ankle [30, 34]. Considering stability three patients complained of persistent instability, which has been reported to be lower in the anatomical repairs. In the long term neither repair prevents arthrosis [30].

There has been some contradiction regarding outcome and duration of follow-up [30, 34]. Considering the literature of the last ten years there is an apparent decline in good to excellent outcome with longer follow-up (Table 2). This might also be a reason for fewer good to excellent outcomes in this series.

Table 2.

Outcome of various techniques in chronic lateral ankle instability reported in the last decade

Author Year No. of patients Follow-up (years) Class Technique Score Good+excellent
Messer et al. [35] 2000 22 34.5 AR Mod. Broström/Gould Karlsson 90.9
Paterson et al. [43] 2000 26 2 AR Semitendinosis NA 81
Krips et al. [31] 2000 185 30 AR 3 techniques Karlsson/Good/Tegner 70–85
Krips et al. [30] 2001 25 vs 29 12.3 AR vs NAR AR vs Evans Good 92 vs 69
Nimon et al. [39] 2001 91 9.7 NAR Evans Karlsson/Good/AOFAS 57
Krips et al. [29] 2002 41 vs 36 5.4 AR vs NAR AR vs Evans Good/Tegner 88 vs 58
Krips et al. [28] 2002 54 vs 45 20 AR vs NAR AR vs Evans Karlsson/Good 69.6 vs 33.3
Sugimoto et al. [48] 2002 13 2.2 NAR Patellar tendon Good 100
Järvelä et al. [23] 2002 17 vs 15 3.1 AR Karlsson vs AITFL Karlsson 93 vs 94
Korkala et al. [27] 2002 25 1.7 NAR Evans Good 80
Cheng and Tho [11] 2002 15 3 NAR Chrisman-Snooks Kaikkonen 93
Jarde et al. [22] 2002 46 5.7 NAR Castaing AOFAS 82
Solakoglu et al. [46] 2003 14 1.7 NAR Coville Chrisman-Snooks 100
Takahashi et al. [49] 2003 13 7 AR Ext. dig. longus Karlsson 100
Westlin et al. [54] 2003 13 10 NAR Ext. dig. brevis Karlsson 100
Baltopoulus et al. [3] 2004 26 8.3 NAR Mod. Evans AOFAS 93
Chen et al. [10] 2004 56 3.1 AR Mod. Broström/Gould AOFAS 91.1
Coughlin et al. [14] 2004 29 1.9 AR Gracilis AOFAS/VAS/Karlsson 100
Schmidt et al. [44] 2005 32 3 AR Karlsson AOFAS 88
Brodsky et al. [6] 2005 73 5.3 AR Broström/Gould AOFAS/SF-36 PCS 84
Okazaki et al. [40] 2005 13 1.9 AR Broström/periost. AOFAS 84.6
Pagenstert et al. [42] 2005 50 3.5 AR Plantaris AOFAS/Karlsson 96
De Vries et al. [15] 2005 40 24 AR Weber Karlsson/Good 65
Bell et al. [5] 2006 22 26.3 AR Broström Roos/Good 91
Ng and Das De [38] 2007 20 1 NAR Broström/Gould/Evans Kaikkonen 100
Jones et al. [24] 2007 4 2 NAR Polyester tape NA 100
Muijs et al. [37] 2008 24 13 AR Duquennoy SF-36/OMAS 81
Choi et al. [12] 2008 65 2.4 AR Mod. Broström Karlsson NA
Li et al. [32] 2009 52 2.4 AR Mod. Broström/Gould Karlsson/Tegner NA
Ateşalp et al. [2] 2009 9 NA NAR Evans NA NA
Hua et al. [19] 2010 81 2.4 AR Broström/Gould AOFAS NA
Trc et al. [52] 2010 47 3.9 AR Mod. Broström Good 100
Mabit et al. [34] 2010 310 13 AR/NAR Multiple techniques Karlsson/Good 71.2–92.2
Shahrulazua et al. [45] 2010 30 0.3 AR Mod. Broström/Gould Kaikkonen 100
Morelli et al. [36] 2010 14 10.8 NAR Hemi-Watson-Jones AOFAS/Good/Tegner/VAS 100
Ibrahim et al. [20] 2010 14 2.8 AR Gracilis AOFAS/Karlsson/VAS/OMAS 100
Ahn et al. [1] 2011 24 3.1 AR Ext. Dig. longus Karlsson 95.8
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AR anatomical reconstruction, NAR non-anatomical reconstruction, Mod. modified, NA not available, AITFL anterior inferior tibiofibular ligament

Even though this study is the largest with the longest follow-up for the hemi-Castaing procedure there are some limitations. The main limitation of this study is its retrospective character, which is related to less reliable data acquisition, especially from the medical charts. Only in a few cases were pre- and postoperative stress radiographs available. As the hemi-Castaing is the sole technique used at our facility we were unable to compare the results with an anatomical repair. However, when comparing the results with the literature, the outcome scores appear lower with fewer good to excellent outcomes observed depending on which outcome scoring system was applied.

We therefore concur with the study by Mabit et al. that the initial surgical treatment of chronic lateral ankle instability should be an anatomical repair with augmentation (i.e. the Broström-Gould technique) and the non-anatomical repair should be reserved for unsuccessful cases or in cases in which no adequate ligamentary remnants are available to suture. The hemi-Castaing technique is a simple procedure, but might prove less satisfactory at the long-term follow-up.

Acknowledgments

Open Access

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