Namba R S, Kabo J M, Dorey F J, Meals R A
Wadsworth Veterans Administration Medical Center, Division of Orthopaedic Surgery, Los Angeles, CA.
Clin Orthop Relat Res. 1991 Jun(267):218-23.
Management of intraarticular fractures is often complicated by joint stiffness long after bony healing has occurred. The following experiments provide biomechanical evidence for the effectiveness of CPM in maintaining joint function in stabilized articular injuries. The ankles of ten adolescent New Zealand white rabbits were penetrated by Steinmann pins to create an intraarticular injury. One limb of each animal was immobilized, and the contralateral limb was placed in a continuous passive motion (CPM) machine for three weeks. Joint stiffness of each ankle was quantified with an arthrograph before injury and after three weeks of treatment. Hindlimb volumes were recorded before injury and monitored at weekly intervals using a water-displacement method. Joint stiffness increased 2.6 times the preinjury levels in limbs that were immobilized for three weeks. There was no statistically significant increase in joint stiffness in ankles treated with CPM compared to preinjury values. The posttraumatic difference between the CPM-treated and immobilized limbs was highly significant; limb swelling was not affected by CPM.
关节内骨折的治疗常常在骨愈合很久之后仍因关节僵硬而变得复杂。以下实验为持续被动运动（CPM）在稳定关节损伤中维持关节功能的有效性提供了生物力学证据。用斯氏针穿透十只青春期新西兰白兔的踝关节以造成关节内损伤。每只动物的一个肢体被固定，对侧肢体置于持续被动运动（CPM）机器中三周。在损伤前和治疗三周后用关节造影术对每个踝关节的关节僵硬程度进行量化。在损伤前记录后肢体积，并使用排水法每周监测一次。固定三周的肢体关节僵硬程度增加到损伤前水平的2.6倍。与损伤前值相比，接受CPM治疗的踝关节关节僵硬程度没有统计学上的显著增加。CPM治疗组和固定组肢体之间的创伤后差异非常显著；肢体肿胀不受CPM影响。
