Garofolo Stephen Q, Conzemius Michael G
Department of Veterinary Clinical Sciences, University of Minnesota College of Veterinary Medicine, Saint Paul, MN, United States.
Vet Comp Orthop Traumatol. 2019 Sep;32(5):362-368. doi: 10.1055/s-0039-1691819. Epub 2019 Jun 14.
The aim of this study was to determine if articulated joint distraction in the canine elbow can effectively maintain a distraction gap between the articular surfaces of the canine elbow under a weight-bearing load.
An articulated external skeletal fixator with turnbuckles was applied to seven canine cadaveric elbow specimens. Specimens were potted and mechanically tested at 135° of flexion, while joint contact pressure was recorded at three locations within the elbow. Joint distraction was sequentially increased, and loads of 5 N, 90 N and 180 N were incrementally applied. This process was repeated until no pressure was recorded at each of the three locations within the elbow under 180 N of applied load.
To achieve 0 N of joint contact force with 180 N of axial load, the average amount of distraction needed was 2.3 ± 0.71 mm (range, 1.8-3.6 mm) at the distal turnbuckles and 1.67 ± 1.10 mm (range, 1.8-2.7 mm) at the proximal turnbuckles.
Results suggest that joint distraction can effectively decrease articular pressure within the canine elbow joint. A maximum of 3.6 mm of distraction between the fixator turnbuckles was necessary to eliminate joint contact for the construct tested. Clinical investigation is necessary to establish if articulated elbow joint distraction is a safe and effective for the treatment of canine elbow osteoarthritis.
本研究的目的是确定犬肘关节的关节撑开能否在负重情况下有效维持犬肘关节关节面之间的撑开间隙。
将带有螺丝扣的可活动外骨骼固定器应用于七个犬类尸体肘关节标本。将标本进行灌注并在屈曲135°时进行力学测试，同时记录肘关节内三个位置的关节接触压力。依次增加关节撑开量，并逐步施加5 N、90 N和180 N的负荷。重复此过程，直至在180 N的施加负荷下肘关节内的三个位置均未记录到压力。
为了在180 N的轴向负荷下实现0 N的关节接触力，远端螺丝扣处所需的平均撑开量为2.3±0.71 mm（范围为1.8 - 3.6 mm），近端螺丝扣处为1.67±1.10 mm（范围为1.8 - 2.7 mm）。
结果表明关节撑开可有效降低犬肘关节内的关节压力。对于所测试的结构，固定器螺丝扣之间最大需要3.6 mm的撑开量来消除关节接触。有必要进行临床研究以确定关节撑开对治疗犬肘关节骨关节炎是否安全有效。
