Anatomical Reconstruction Of Posterolateral Corner In The Knee Injuries

Kornah, Bahaa Ali; El-Nahas, Mohamed Abdul-Rahman; Abdul-Rahman, Mahmoud Mohamed Abdul-Hamid

doi:https://doi.org/10.21608/aimj.2025.446661

Anatomical Reconstruction Of Posterolateral Corner In The Knee Injuries

Document Type : Original Article

Authors

¹ Professor of Orthopedic Surgery, Faculty of Medicine, Al-Azhar University, Cairo, Egypt

² Assistant professor of Orthopedic Surgery, Faculty of Medicine, Al-Azhar University, Cairo, Egypt

³ Assistant Lecturer of Orthopedic Surgery, Faculty of Medicine, Al-Azhar University, Cairo, Egypt

https://doi.org/10.21608/aimj.2025.446661

Abstract

Background: Posterolateral corner (PLC) injuries are frequently missed due to their anatomical complexity and common association with cruciate ligament tears. Undiagnosed PLC injuries contribute to failed cruciate ligament reconstructions and accelerated degenerative joint changes. While multiple reconstruction techniques exist, the optimal management remains debated.
Methods: This prospective study evaluated the outcomes of the modified Larson technique in 20 patients with grade III PLC instability at Al-Azhar University Hospitals (October 2022–December 2024). Follow-up assessments included the Dial Test, Varus stress radiographs (quantifying lateral joint gapping), and functional outcomes (Lysholm score and IKDC subjective score).
Results: The cohort comprised 18 males and two females, with a mean follow-up of 13.3 months (range: 12–18). Preoperative varus stress radiographs showed a mean side-to-side difference of 9.3±2.36 mm, improving to 3.3±1.59 mm postoperatively. All patients achieved stability in full extension without adductor thrust during ambulation, except two with residual grade 2 laxity and positive Dial Tests. Functional scores improved significantly: Lysholm (42.25±11.18 to 81.35±10.29; p<0.001) and IKDC (40.6±6.0 to 83.65±9.15; p<0.001).
Conclusion: The modified Larson technique effectively restored varus and rotational stability in grade III PLC injuries, with significant functional improvement. Residual laxity in 10% of cases suggests further refinement may be needed for severe instability.

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