Abstract
We present a technique for the combined anterior cruciate ligament (ACL) and anterolateral ligament (ALL) reconstruction using the superficial layer quadriceps tendon graft. Anatomic reconstruction is achieved with outside-in femoral tunnel drilling. The femoral drill guide has an intra-articular placement at the femoral footprint of the ACL and an extra-articular placement at the femoral ALL attachment. This surgical technique does not need any special instruments and consists of 3 bone tunnels. The long length and customized superficial quadriceps tendon graft is harvested in a minimally invasive manner and allows an accessible and low-cost reconstruction of both ligaments.
Technique Video
The anterior cruciate ligament (ACL) is the most often injured ligament in the knee that requires surgical treatment.1 Regardless of advances in surgical technique, high failure rates are reported, especially in younger and physically active individuals.2, 3, 4, 5, 6
The anterolateral ligament (ALL) has received enhanced attention recently.7, 8, 9 Despite biomechanical controversies, rotatory instability due to ACL plus anterolateral structure injuries may be one of the causes for isolated ACL reconstruction failures.10,11 Clinical studies have shown that combined ACL and ALL reconstruction can decrease graft failure and provide better rotational control compared with isolated reconstruction.12, 13, 14, 15 The most common graft utilized in combined reconstruction is the hamstring (HT) autograft.16
The quadriceps tendon (QT) graft is gaining popularity in ACL reconstruction,17,18 but it is still the least used autograft.19 Biomechanical studies indicate the QT graft with higher structural properties than bone–patellar tendon–bone (BPTB),20,21 and a meta-analysis showed comparable functional outcomes to HT and BPTB.22 Furthermore, the QT is an adjustable graft that can be harvested in different ways.23,24
The purpose of this technical note is to present a combined ACL and ALL reconstruction technique using a superficial layer quadriceps tendon graft harvested in a minimally invasive approach without specialized instruments.
Surgical Technique
The patient is placed in a supine position, and the knee is allowed to move through full range of motion. Examination under anesthesia should confirm the insufficiency of the ACL and associated rotational instability.
The anatomic landmarks identified are the patella, the QT, the lateral epicondyle, the Gerdy tubercle, the head of the fibula, and the lateral tibial plateau.
Graft Harvest
A padded tourniquet is applied to the thigh. A 3-cm longitudinal skin incision is made from the superior pole of the patella at the junction of the lateral and middle third extending proximally (Fig 1). After appropriate dissection, the QT is identified. The graft is harvested from the lateral portion of the rectus femoris tendon, which is the superficial lamina of the QT. The surgical plane between the superficial and intermediate laminae is identified around 3 cm proximal to the patella (Fig 2, Video 1). After 2 longitudinal incisions in the superficial lamina, a 10-mm-wide graft is created. The superficial layer quadriceps tendon graft is elevated (Fig 3), and its distal end is detached from the patella (Fig 4). The distal free end of the graft is whipstitched with nonabsorbable sutures. The dissection of the superficial lamina is extended proximally for 8 cm using Metzenbaum scissors (Fig 5), ensuring that intermediate and deep layers of the QT are preserved. A closed tendon stripper (Sartori) is pushed carefully with the knee in 20° of flexion, and the graft is harvested (Fig 6). Paratenon, subcutaneous tissue, and skin are closed.
Graft Preparation
The total length normally ranges from 28 to 35 cm (Fig 7). The muscle fibers are removed and measured. The graft is folded in an asymmetric fashion. The distal portion is folded to form a double or triple graft for the ACL portion of the graft. The ALL portion of the graft is the proximal remainder without folding (Fig 8). The ACL graft should be at least 9 cm in length and 8 mm in diameter.
Arthroscopic Evaluation
A high anterolateral portal is created and a low anteromedial portal is established under direct vision (Fig 9). Evaluation of the cruciate ligaments and possible associated lesions is performed.
ACL Reconstruction
The intercondylar area is prepared by shaving the inside wall of the lateral femoral condyle. The femoral tunnel for the ACL reconstruction is the same used for the ALL reconstruction. The femoral tunnel is made using an outside-in technique.25 A 3-cm lateral skin incision is made along the lateral aspect of the distal femur over the lateral epicondyle, and the iliotibial tract is split longitudinally. The tip of the drill guide (Sartori) is placed at the femoral footprint of the ACL and the external arm of the drill guide lies slightly posterior and proximal to the lateral epicondyle, to replicate the ALL femoral attachment (Fig 10). A guidewire is inserted and then the drilling of the tunnel is performed. The tibial tunnel is made within the topography of the native ACL tibial footprint.26 The diameter of the tunnels is equal to the diameter of the previously prepared ACL graft. The graft is passed from the tibial to femoral tunnel using a suture shuttle (Fig 11). The proximal portion of the graft, which will be used for ALL reconstruction, exits through the lateral condyle (Fig 12).
Femoral ACL graft fixation is performed in an outside-in manner using an interference screw with a diameter equal to the size of the tunnel. Tibial ACL graft fixation is performed with the graft tensioned and the knee at 20° of flexion with an interference screw 1 size greater than the tunnel diameter.
ALL Reconstruction
The remaining proximal portion of graft is used for ALL reconstruction. The tibial tunnel for the ALL is created between the Gerdy tubercle and the fibular head, approximately 5 to 10 mm below the lateral articular plateau. The drill guide (Sartori) helps in performing the ALL tibial tunnel exit distal to the ACL tibial tunnel (Fig 13). It is also possible to drill the tunnel freehand. The graft is passed beneath the iliotibial tract (Fig 14) and shuttled with a suture in the tibial tunnel. Tibial fixation is performed with an interference screw in neutral rotation and full extension27 (Fig 15, Video 1).
After reconstruction, closure in layers is performed. We do not use drain or immobilize. A routine ACL rehabilitation plan is instituted.
Discussion
The harvest approach described by Raman et al.24 and Thamrongskulsiri et al.28 makes possible a superficial layer quadriceps autograft of sufficient length and diameter for the combined ACL and ALL reconstruction.
ACL reconstruction techniques may not restore normal tibial rotation,29, 30, 31 and some patients persist with a positive pivot shift.32, 33, 34 Anterolateral complex injuries are one possible cause of high-grade pivot shift and residual rotational instability after surgery.35,36 Despite conflicting data from biomechanical studies,37, 38, 39, 40 in the clinical scenario, combined ACL and ALL reconstruction presents good functional outcomes, improved knee stability, and less failure rate than isolated ACL reconstruction, especially in high-risk populations.12, 13, 14, 15,41,42 The tunnel preparation for anatomic ALL reconstruction described utilizes the procedure published with a single gracillis.15 The rectus femoris tendon graft option can be used in the same manner and probably with an increased diameter.
Biomechanical data have shown that QT autograft has favorable characteristics43,44 with a greater cross-sectional area20,45 to both HT and BPTB. Recent studies have concluded that QT autograft has similar outcomes, knee stability, and failure rate compared to HT and BPTB46,47 in ACL surgery.
The QT graft has an outstanding versatility. Clinical data show similar outcomes with partial or full thickness48 and with or without bone block graft.49,50 Despite variability in QT anatomy,51 it is possible to harvest the rectus femoris tendon before the layers merge. Soft tissue QT autografts appear to have fewer complications.49 Knee muscle strength deficits are a major issue in ACL rehabilitation. Knee extensor strength after QT autograft is similar to BPTB.52 The harvest utilized in this report could raise the possibility of hematoma in the donor site and decrease extensor knee strength.
The described technique utilizing the superficial layer quadriceps tendon graft harvested in a minimally invasive manner is a feasible alternative to combined ACL and ALL reconstruction in primary and revision surgery (Tables 1 and 2). Clinical studies are necessary to demonstrate the effectiveness of this technique.
Table 1.
Advantages | Disadvantages |
---|---|
Predictable graft diameter | Quadriceps strength reduction |
Graft harvest with standard instruments | Risk of hematoma formation |
Preservation of hamstring strength | Additional incision in lateral leg |
Low morbidity | Additional screw for ligament fixation |
Table 2.
Pearls | Pitfalls |
---|---|
Identification of surgical plane between the superficial and intermediate quadriceps tendon layer | Disrupting the knee capsule |
Dissection of the superficial quadriceps tendon graft before using the tendon stripper | Tibial tunnel confluence |
Whipstitching the graft with a strong nonabsorbable suture, with reasonable force applied to the tendon stripper | Cautious anterolateral tibial tunnel positioning to avoid plateau fracture |
Knee in 20° of flexion for graft harvest | Protruding screws can irritate the iliotibial tract |
Skin incision proximal and posterior to the lateral epicondyle | |
Adequate femoral drill guide placement to ensure anatomic reconstruction of both ligaments | |
Passing the anterolateral graft under the iliotibial tract |
Disclosures
All authors (B.G.B., S.M de G.C., C.P.H., M.C.F.R., F.S.M., M.C.F.R.) declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
Supplementary Data
References
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