Ryser D K, Erickson R P, Cahalan T
Department of PM&R, Mayo Clinic, Rochester, MN 55905.
Arch Phys Med Rehabil. 1988 Oct;69(10):840-5.
Recently introduced prosthetic socket designs for the above-knee amputee (AKA) feature a narrow medial-lateral dimension and emphasize maintenance of the residual limb in full physiologic adduction. Quantitative data on the effect of frontal plane limb position on the isometric hip abductor strength of ten otherwise healthy AKAs were obtained in the standing position. Residual limb isometric and isokinetic abductor strength was also measured and compared with that of the intact limb and with that of ten healthy age-, sex-, and height-matched control subjects using an identical technique. The testing hardware consisted of a modified Cybex II Isokinetic Dynamometer with a custom-made pelvis and trunk stabilizing device. Anthropometric measurements were taken. Results showed an essentially linear increase in residual limb abduction strength with progressive adduction from 30 degrees abduction to 16 degrees adduction. The average increase in abduction torque was .97% (range .29 to 1.5) of the peak neutral position strength per degree of change in femur angle when corrected for the effect of gravity. Similar strength increases with adduction of the femur were found for intact and control limbs. Mean residual limb isometric abduction torque measured 30% less than the intact limb value (p = .0018). The difference between the intact and the control limb mean isometric abduction torques was less than 1%. Isokinetic testing was technically more difficult than isometric testing but revealed similar weakness of the residual limb abductors when compared to the intact and control limbs.
最近推出的用于膝上截肢者（AKA）的假肢接受腔设计具有较窄的内外侧尺寸，并强调将残肢保持在完全生理内收状态。在站立位获取了关于额状面肢体位置对10名其他方面健康的AKA等长髋外展肌力量影响的定量数据。还测量了残肢的等长和等速外展肌力量，并使用相同技术将其与健侧肢体以及10名年龄、性别和身高匹配的健康对照受试者的力量进行比较。测试硬件包括一台经过改良的Cybex II等速测力计以及一个定制的骨盆和躯干稳定装置。进行了人体测量。结果显示，随着从外展30度逐渐内收到内收16度，残肢外展力量基本呈线性增加。在校正重力影响后，股骨角度每变化一度，外展扭矩的平均增加量为中立位峰值力量的0.97%（范围为0.29%至1.5%）。在健侧肢体和对照肢体中也发现随着股骨内收力量有类似增加。残肢等长外展扭矩的平均值比健侧肢体值低30%（p = 0.0018）。健侧肢体和对照肢体等长外展扭矩平均值之间的差异小于1%。等速测试在技术上比等长测试更困难，但与健侧肢体和对照肢体相比，仍显示出残肢外展肌有类似的力量减弱。
