METHODS: 362 patients with painful basal thumb osteoarthritis were evaluated over a 2-year period. Pain rating on a visual analog scale, trapeziometacarpal and metacarpophalangeal motion, and grip and pinch strength were evaluated. The shape of the metacarpal head was assessed on strict lateral radiographs using the \"A/r\" ratio.
RESULTS: Round metacarpal heads had significantly greater and more frequent metacarpophalangeal hyperextension than flat heads (28° vs. 8°, and 78% vs. 29%). Metacarpophalangeal hyperextension adversely impacted trapeziometacarpal motion in antepulsion (27° vs. 32°), abduction (25° vs. 30°) and pinch strength (3.6 vs. 4.6 KgF).
CONCLUSIONS: Our findings indicate that the shape of the metacarpal head influences metacarpophalangeal hyperextension in trapeziometacarpal osteoarthritis. Metacarpophalangeal hyperextension adversely impacted pinch strength and trapeziometacarpal motion.
METHODS: Level IV, Retrospective case series.
方法:对362例疼痛性基底拇指骨关节炎患者进行了为期2年的评估。视觉模拟量表上的疼痛评分,梯形掌骨和掌指骨运动,并对握力和捏合强度进行了评估。使用“A/r”比率在严格的横向X光片上评估掌骨头的形状。
结果:圆形掌骨头的掌指骨过度伸展明显大于平头(28°对8°,和78%对29%)。掌指骨过度伸展对前推时的梯形掌骨运动产生不利影响(与27°相比。32°),外展(25°与。30°)和夹紧强度(3.6与4.6KgF)。
结论:我们的研究结果表明,掌骨头的形状影响梯形掌骨骨关节炎的掌指过伸性。掌指骨过伸会对捏合强度和梯形掌骨运动产生不利影响。
方法:四级,回顾性病例系列。