Kahmann R D, Buttermann G R, Lewis J L, Bradford D S
Department of Orthopaedic Surgery, University of Minnesota, Minneapolis.
Spine (Phila Pa 1976). 1990 Sep;15(9):971-8. doi: 10.1097/00007632-199009000-00025.
The effect of externally applied spinal loads on facet mechanics before and after facet capsulectomy and disc alteration was investigated. Four control and four chymopapain-treated specimens were tested. Facet load and resultant load location were determined in the unaltered state, after facet capsulectomy, and after discectomy using a newly developed, noninvasive measurement technique. Resultant contact load locations shifted in a predictable manner. Caudal shift in contact locations occurred with chymopapain treatment or discectomy but was variable with capsulectomy. Facet load changed with applied load magnitude and direction; no significant change was noted after intradiscal chymopapain, discectomy, or capsulectomy. The significance of the lack of force change with disc narrowing is unknown. Perhaps, observed facet degeneration results from a change in the joint motion and contact location rather than change in facet load.
研究了在小关节囊切除和椎间盘改变前后，外部施加的脊柱负荷对小关节力学的影响。对四个对照标本和四个木瓜凝乳蛋白酶处理的标本进行了测试。使用一种新开发的非侵入性测量技术，在未改变状态、小关节囊切除后和椎间盘切除后，确定小关节负荷和合力负荷位置。合力接触负荷位置以可预测的方式移动。木瓜凝乳蛋白酶治疗或椎间盘切除后，接触位置发生尾侧移位，但小关节囊切除后移位情况不一。小关节负荷随施加负荷的大小和方向而变化；椎间盘内注射木瓜凝乳蛋白酶、椎间盘切除或小关节囊切除后未观察到显著变化。椎间盘狭窄时力无变化的意义尚不清楚。也许，观察到的小关节退变是由关节运动和接触位置的变化而非小关节负荷的变化引起的。
