The “Anterolateral Ligament Expert Group Consensus Paper” provides a comprehensive overview of the anterolateral ligament (ALL) and its role in managing internal rotation and instability in anterior cruciate ligament (ACL)-deficient knees. The consensus, derived from expert opinions and recent research, covers various aspects:
Anatomy and Radiographic Landmarks:
- Location: The ALL is situated deep to the iliotibial band.
- Femoral Origin: Located just posterior and proximal to the lateral epicondyle.
- Tibial Attachment: Approximately 21.6 mm posterior to Gerdy’s tubercle and 4-10 mm below the tibial joint line.
- Radiographic Identification: On lateral radiographs, the femoral origin is in the postero-inferior quadrant, and the tibial attachment is near the center of the proximal tibial plateau.
Biomechanics:
- Function: The ALL acts as a secondary stabilizer, particularly in ACL-deficient knees, by restricting tibial internal rotation and influencing the pivot shift phenomenon.
- Isometry: Optimal graft placement shows the ALL is tight in extension and relaxes during flexion.
Clinical and Radiographic Diagnosis:
- Imaging Techniques: The ALL can be visualized using ultrasound or T2-weighted coronal MRI scans with proton density fat-suppressed evaluation.
- Associated Injuries: ALL injuries are often linked with Segond fractures and commonly occur alongside acute ACL injuries.
Lesion Classification:
- Injury Patterns: The consensus discusses various ALL injury patterns, emphasizing the importance of recognizing these lesions to guide appropriate management strategies.
Surgical Technique and Clinical Outcomes:
- Reconstruction Indications: For high-risk patients, combined ACL and ALL reconstruction is recommended to enhance rotational stability and reduce re-rupture rates.
- Surgical Approach: Techniques involve anatomical reconstruction of the ALL to restore native knee biomechanics.
- Outcomes: Studies indicate that combined reconstruction does not increase postoperative complications compared to isolated ACL reconstruction.
In summary, this consensus paper underscores the significance of the ALL in knee stability. It advocates for the consideration of ALL injuries in the diagnostic and surgical planning processes to improve patient outcomes following ACL injuries.Link to the article: Anterolateral Ligament Expert Group Consensus Paper on the Management of Internal Rotation and Instability of the Anterior Cruciate Ligament – Deficient Knee
