The effect of graft strength on knee laxity and graft in-situ forces after posterior cruciate ligament reconstruction.

Surgical reconstruction is generally recommended for posterior cruciate ligament (PCL) injuries; however, the use of grafts is still a controversial problem. In this study, a three-dimensional finite element model of the human tibiofemoral joint with articular cartilage layers, menisci, and four main ligaments was constructed to investigate the effects of graft strengths on knee kinematics and in-situ forces of PCL grafts. Nine different graft strengths with stiffness ranging from 0% (PCL rupture) to 200%, in increments of 25%, of an intact PCL's strength were used to simulate the PCL reconstruction.

Sonographic imaging of meniscal subluxation in patients with radiographic knee osteoarthritis.

Background/purpose: This study was undertaken to describe the sonographic features of meniscal subluxation in the weight-bearing position and to determine any association between meniscal subluxation and radiographic osteoarthritis.

Methods: In total, 238 knees with symptoms were examined successfully with weight-bearing anteroposterior and lateral radiographs and high resolution ultrasonography. The radiographs were examined to determine whether participants had radiographic osteoarthritis, graded using the Kellgren-Lawrence Scale.