Weidow Jonas, Kärrholm Johan, Saari Tuuli, McPherson Andy
Department of Orthopaedics, Sahlgrenska Hospital, Göteborg University, Göteborg, Sweden.
Clin Orthop Relat Res. 2007 Jan;454:27-34. doi: 10.1097/BLO.0b013e31802bab25.
The pattern of knee motion in patients with lateral osteoarthritis may be associated with the pathogenesis of this disease. Based on previous findings of decreased anteroposterior femoral condylar translation in knees with medial knee osteoarthritis, we asked whether a similar pattern of knee kinematics in lateral osteoarthritis could be related to the wear pattern on the tibial plateau. We used sequential radiostereometric images to study kinematics during active weightbearing extension in five knees with lateral osteoarthritis and 11 control knees. At 45 degrees of flexion, the posterior circular center of the lateral femoral condyle displaced posteriorly at 45 degrees and moved anteriorly during extension in both groups. There was also a proximal displacement with extension, but from a more distal position in the osteoarthritis group. We could only partly relate the kinematics of knees with lateral osteoarthritis to the wear pattern on the tibial plateau. Contrary to our hypothesis of normal anterior displacement of the medial and increased posterior displacement of the lateral femoral condyle, we observed no change of anterior-posterior displacements of the lateral condyle.
外侧骨关节炎患者的膝关节运动模式可能与该疾病的发病机制有关。基于先前关于内侧膝关节骨关节炎患者股骨髁前后平移减少的研究结果，我们探讨外侧骨关节炎患者类似的膝关节运动学模式是否与胫骨平台的磨损模式有关。我们使用连续的放射立体图像来研究5例外侧骨关节炎膝关节和11例对照膝关节在主动负重伸展过程中的运动学。在屈膝45度时，两组中外侧股骨髁的后圆形中心均在45度时向后移位，并在伸展过程中向前移动。伸展时也有近端移位，但骨关节炎组的起始位置更靠远端。我们只能部分地将外侧骨关节炎膝关节的运动学与胫骨平台的磨损模式联系起来。与我们关于内侧正常向前移位和外侧股骨髁向后移位增加的假设相反，我们观察到外侧髁的前后移位没有变化。
