Kuo Li-Chieh, Lin Chien-Ju, Chen Guan-Po, Jou I-Ming, Wang Chien-Kuo, Goryacheva Irina G, Dosaev Marat Z, Su Fong-Chin
Department of Occupational Therapy, National Cheng Kung University, Tainan 701, Taiwan.
Department of Biomedical Engineering, National Cheng Kung University, Tainan 701, Taiwan ; Musculoskeletal Research Center, National Cheng Kung University, Tainan 701, Taiwan.
Biomed Res Int. 2014;2014:157295. doi: 10.1155/2014/157295. Epub 2014 Feb 10.
This study investigated how the posture of the thumb while performing common pinch movements and the levels of pinch force applied by the thumb affect the arthrokinematics of the trapeziometacarpal joint in vivo. Fifteen subjects performed the pinch tasks at the distal phalange (DP), proximal interphalangeal (PIP) joint, and metacarpophalangeal (MP) joint of the index finger with 0%, 50%, and 80% of maximal pinch forces by a single-axis load cell. 3D images of the thumb were obtained using the computed tomography. The results show that the reference points moved from the central region to the dorsal-radial region when changing from pinching the DP to the MP joint without pinching force being applied. Pinching with 80% of the maximum pinching force resulted in reference points being the closest to the volar-ulnar direction. Significant differences were seen between 0% and 50% of maximum pinch force, as well as between 0% and 80%, when pinching the MP joint in the distal-proximal direction. The effects of posture of the thumb and applied pinch force on the arthrokinematics of the joint were investigated with a 3D model of the trapeziometacarpal joint. Pinching with more than 50% of maximum pinch force might subject this joint to extreme displacement.
本研究调查了在进行常见捏取动作时拇指的姿势以及拇指施加的捏力水平如何在体内影响大多角骨-第一掌骨关节的关节运动学。15名受试者通过单轴测力传感器，以最大捏力的0%、50%和80%在食指的远节指骨（DP）、近端指间关节（PIP）和掌指关节（MP）处执行捏取任务。使用计算机断层扫描获取拇指的三维图像。结果表明，在不施加捏力的情况下，从捏取DP关节改为捏取MP关节时，参考点从中心区域移至背桡侧区域。以最大捏力的80%进行捏取时，参考点最靠近掌尺侧方向。在向近端-远端方向捏取MP关节时，最大捏力的0%和50%之间以及0%和80%之间存在显著差异。利用大多角骨-第一掌骨关节的三维模型研究了拇指姿势和施加的捏力对该关节关节运动学的影响。以超过最大捏力50%的力量进行捏取可能会使该关节发生极端位移。
