Posterolateral bị cô lập không ổn định luân chuyển của đầu gối là một mô hình chấn thương phổ biến mà có thể dẫn đến mức độ quan trọng của khuyết tật chức năng. Phức tạp chấn thương này có thể là một thách thức vấn đề chẩn đoán và điều trị cho các bác sĩ phẫu thuật chỉnh hình | Acute and Chronic Posterolateral Rotatory Instability of the Knee Frank S. Chen MD Andrew S. Rokito MD and Mark I. Pitman MD Abstract Isolated posterolateral rotatory instability of the knee is an uncommon injury pattern that may result in significant degrees of functional disability. This injury complex can be a challenging diagnostic and therapeutic problem for the orthopaedic surgeon. The presence of associated ligamentous and soft-tissue injuries resulting in combined instability patterns further complicates management. The results of recent research have enhanced our understanding of the complex anatomy and biomechanics of the posterolateral aspect of the knee. Numerous surgical techniques have been described for both repair and reconstruction of the injured posterolateral structures however long-term functional results have been only moderately successful. J Am Acad Orthop Surg 2000 8 97-110 Injuries involving the posterolateral structures of the knee are significantly less common than those affecting the medial or anterolateral structures but may result in greater degrees of disability. The overall incidence of acute posterolateral rotatory instability PLRI has been reported to be less than 2 of all acute ligamentous knee Because the complex anatomy and biomechanics of the posterolateral structures are not completely understood PLRI of the knee represents a challenging diagnostic and therapeutic problem for the orthopaedic surgeon. Historically PLRI has been defined as the instability pattern that results from an injury to the arcuate ligament complex. It has been postulated that the lateral tibial plateau externally rotates around the axis of the intact posterior cruciate ligament PCL and subluxates posteriorly in relation to the lateral femoral This concept of the PCL as the center of rotation of the knee has been challenged it is now believed that a coupled relationship exists between the posterolateral structures and the cruciate .
