Anderson D R, Newman A P, Daniels A U
Department of Orthopaedics, University of Tennessee, Chattanooga, USA.
Knee Surg Sports Traumatol Arthrosc. 1993;1(1):44-50. doi: 10.1007/BF01552158.
The purpose of this study was to determine the in vitro load-transmission characteristics of the canine knee, paying particular attention to the positioning effect of the meniscus in the coronal plane. The intact joint was first loaded and then tested under two different loading conditions after a complete medial meniscectomy. The first set of test conditions attempted to simulate those used by previous investigators, by ignoring the spacer effect of the meniscus. The second set of tests were carried out following varus rotation of the joint (to account for the loss of the meniscal spacer) to assure initial contact in both tibiofemoral compartments at the start of test cycle. It is presumed that this varus realignment occurs during weight bearing following meniscectomy in vivo. As in previous studies, the joints experienced slightly larger displacements (although not statistically significant) and had lower stiffness values following medial meniscectomy than when intact. However, following varus realignment of the joint after meniscectomy, the displacement was markedly smaller (-35% to -49%; P < 0.01) and the structural stiffness was much greater (47-123%; P < 0.05) over the range of forces analyzed, compared with the intact joint. The ratio of dissipated to input energy was 42% for the intact joint, and increased following meniscectomy to 54% (P < 0.05) with realignment and 55% (P < 0.05) without realignment. Measured contact area decreased by 17% (P < 0.05) following meniscectomy alone, and by 12% (P < 0.05) following meniscectomy with realignment.(ABSTRACT TRUNCATED AT 250 WORDS)
本研究的目的是确定犬膝关节的体外负荷传递特性，特别关注半月板在冠状面的定位作用。首先对完整关节进行加载，然后在完全内侧半月板切除术后，在两种不同加载条件下进行测试。第一组测试条件试图通过忽略半月板的间隔作用来模拟先前研究者使用的条件。第二组测试在关节内翻旋转后进行（以考虑半月板间隔的丧失），以确保在测试周期开始时两个胫股关节腔均能初始接触。据推测，这种内翻重新排列发生在体内半月板切除术后的负重过程中。与先前研究一样，内侧半月板切除术后，关节的位移略大（尽管无统计学意义），刚度值低于完整时。然而，半月板切除术后关节内翻重新排列后，在所分析的力范围内，与完整关节相比，位移明显更小（-35%至-49%；P<0.01），结构刚度更大（47%-123%；P<0.05）。完整关节的消散能量与输入能量之比为42%，半月板切除术后，重新排列时增加到54%（P<0.05），未重新排列时增加到55%（P<0.05）。单纯半月板切除术后，测量的接触面积减少17%（P<0.05），半月板切除术后重新排列时减少12%（P<0.05）。（摘要截短于250字）
