Chang Whan Han

Posteromedial compartment cement extrusion after unicompartmental knee arthroplasty treated by arthroscopy: a case report

Unicompartmental knee arthroplasty (UKA) with extrusion of cement into the posterior compartment of the knee is uncommon. Various problems after a UKA procedure, such as aseptic loosening, polyethylene wear and progressive arthritis have been reported. This study will report on a patient with extrusion of cement fragments into the posteromedial compartment of the knee after a UKA procedure. This complication was treated successfully with the direct posterior–posterior triangulation arthroscopic visualization method. In cementing the prosthesis, it is of paramount importance to take caution to completely remove extruded cement remnants in order to prevent this complication during UKA.

Synovial chondromatosis of the posterior cruciate ligament managed by a posterior–posterior triangulation technique

Various causes have been reported for cystic lesions arising from the cruciate ligaments. We present a case of synovial chondromatosis that involved the posterior cruciate ligament and was treated by an arthroscopic posterior–posterior triangulation method. We recommend that synovial chondromatosis be considered in the differential diagnosis of cystic lesions of the cruciate ligaments. Lesions involving the posterior aspect of the posterior cruciate ligament, as in the presented case, can be accessed via the standard anterior arthroscopic portals. However, scattered synovial chondromatosis masses located in the posterolateral compartment are difficult to access via anterior portals. We suggest that the arthroscopic posterior–posterior triangulation technique may be useful for the management of such cases.