目的:评估模拟动态运动后尺骨缩短对前臂远端负荷的影响。
方法:使用定制的可调节植入物模拟尺骨缩短,以模拟9具尸体四肢中多达4毫米的尺骨缩短(-4毫米)。称重传感器放置在远端尺骨和桡骨以量化轴向载荷。使用手腕和前臂运动模拟器,在动态屈曲过程中测量绝对载荷和百分比载荷,尺位偏差(UD),屈曲飞镖投掷(DT),和内旋。
结果:在屈曲期间尺骨缩短的每个间隔,尺骨远端绝对负荷和百分比均显着降低,UD,DT,和内旋。尺骨远端没有压缩载荷,事实上,在DT和内旋期间,在尺骨2毫米的尺骨缩短处测量拉伸载荷,在3毫米的屈曲,在UD期间为4mm。
结论:尺骨远端负荷随着拉伸负荷的产生而逐渐降低,并伴有尺骨顺次缩短。
结论:尺骨缩短大于2mm可导致尺骨远端拉伸负荷。在处理尺骨嵌塞综合征时,可能不需要过度缩短来缓解症状。
OBJECTIVE: To evaluate the effect of ulnar shortening on distal forearm loading following simulated dynamic motion.
METHODS: Ulnar shortening was simulated using a custom-built adjustable implant to simulate up to 4 mm of ulnar shortening (-4 mm) in 9 cadaveric extremities. Load cells were placed in the distal ulna and radius to quantify axial loading. Using a wrist and forearm motion simulator, absolute and percentage loads were measured during dynamic flexion, ulnar deviation (UD), flexion dart throw (DT), and pronation.
RESULTS: There was a significant decrease in absolute and percentage distal ulnar loads at each interval of ulnar shortening during flexion, UD, DT, and pronation. The distal ulna bore no compressive loads, and in fact, tensile loads were measured in the ulna at 2 mm of ulnar shortening during DT and pronation, at 3 mm during flexion, and at 4 mm during UD.
CONCLUSIONS: A progressive decrease in distal ulnar loads with generation of tensile loads was observed with sequential ulnar shortening.
CONCLUSIONS: Ulnar shortening greater than 2 mm can result in tensile loading in the distal ulna. When managing ulnar impaction syndrome, excessive shortening may not be required to provide relief of symptoms.