Intrinsic and extrinsic contributions to the passive moment at the metacarpophalangeal joint
Intrinsic and extrinsic contributions to the passive moment at the metacarpophalangeal joint
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DOI：
10.1016/s0021-9290(00)00159-7
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发表时间：
2000-12-01
影响因子：
2.4
通讯作者：
Crago, PE
中科院分区：
文献类型：
--
作者：
Knutson, JS;Kilgore, KL;Crago, PE
本研究的目的是确定手指关节的被动活动范围是否更多地受到内在组织（交叉单个关节）或外在组织（交叉多个关节）的限制。将食指掌指关节处的被动力矩建模为内在分量和外在分量之和。内禀分量仅作为MP关节角的函数进行建模。外部分量建模为关节角和腕部角的函数。将8名受试者的手腕固定在7个不同的位置，当手指以恒定的速率在其范围内旋转时，记录下他们MP关节处的被动力矩。通过模型拟合力矩-角度数据，计算MP关节角度和手腕位置范围内的外在和内在分量。当MP关节接近其伸展极限时，腕部伸展60度时，外部贡献的中位数百分比为94%，腕部弯曲60度时为14%。当MP关节接近其屈曲极限时，这些百分比分别为40%和88%。我们的研究结果表明，在大多数手腕角度下，外源性组织比内源性组织在MP关节伸展和屈曲的极限处提供更大的约束。当手腕屈曲或伸展到足以放松外在组织时，内在组织占主导地位。通过检查模型计算的参数值，可以推断出内在和外在组织的附加特性。Elsevier Science Ltd.出版。
The purpose of this investigation was to determine whether the passive range of motion at the finger joints is restricted more by intrinsic tissues (cross a single joint) or by extrinsic tissues (cross multiple joints). The passive moment at the metacarpophalangeal (MP) joint of the index finger was modeled as the sum of intrinsic and extrinsic components. The intrinsic component was modeled only as a function of MP joint angle. The extrinsic component was modeled as a function of MP joint angle and wrist angle. With the wrist fixed in seven different positions the passive moment at the MP joint of eight subjects was recorded as the finger was rotated through its range at a constant rate. The moment-angle data were fit by the model and the extrinsic and intrinsic components were calculated for a range of MP joint angles and wrist positions. With the MP joint near its extension limit, the median percent extrinsic contribution was 94% with the wrist extended 60 degrees and 14% with the wrist flexed 60 degrees. These percentages were 40 and 88%, respectively, with the MP joint near its flexion limit. Our findings indicate that at most wrist angles the extrinsic tissues offer greater restraint at the limits of MP joint extension and flexion than the intrinsic tissues. The intrinsic tissues predominate when the wrist is flexed or extended enough to slacken the extrinsic tissues. Additional characteristics of intrinsic and extrinsic tissues can be deduced by examining the parameter values calculated by the model. Published by Elsevier Science Ltd.