掌板松解延长术治疗近指关节屈曲僵硬

目的:总结掌板松解延长术治疗近侧指间关节屈曲僵硬的经验。方法:对用掌板松解延长术治疗的26例31指病人进行回顾分析。结果:29指效果良好,伸屈角度正常。2指术后感染,效果较差,有效率93%。结论:掌板松解延长术最大限度地保存了掌板及关节囊的完整性,使近侧指间关节功能的完全恢复及防止再粘连有了保证,且有术后功能锻炼时疼痛轻,功能恢复快等优点。

肱骨髁间骨折后遗屈曲型肘关节僵硬的治疗

目的 探讨肱骨髁间骨折后遗屈曲型肘关节僵硬的治疗方法及效果。方法 采用肘关节松解及术后早期功能锻炼的综合疗法。结果 治疗 11例，随访 6～ 24个月，肘关节主动屈伸活动范围增加 40°～ 100°，平均 80.5°，前臂旋转活动范围增加 30°～ 60°，平均 45.6°，旋前旋后基本正常。结论 采用肘关节松解及术后早期功能锻炼的综合疗法可以有效地改善肱骨髁间骨折后遗屈曲型肘关节僵硬的肘关节功能。

Buckling of a stiff thin film on a compliant substrate under anisotropic biaxial prestrain

The structure of stretchable electronics is based on the buckling of a thin film on a compliant substrate. Under anisotropic biaxial prestrains, this structure may buckle into several patterns, including cylindrical, checkerboard, and undulating patterns. The displacement and energy of each pattern are deduced analytically. By comparing their minimum potential energies, the critical buckling condition of each pattern is determined. After secondary bifurcation, the checkerboard pattern occurs just above the critical prestrains, but the undulating pattern dominates other regions. The buckling amplitude and wavenumber of the undulating pattern are shown under biaxial prestrains. Even if the structure is under equi-biaxial prestrains, it may buckle into an asymmetric undulating pattern.