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Paper Review Contribution of the extrinsic and intrinsic hand muscles to the moments in finger joints Z.M. Li, V.M. Zatsiorsky, M.L. Latash Clinical Biomechanics 15(2000). 學號: N16941703 學生 : 洪振翔 指導教授 : 朱銘祥 林宙晴 實驗室:人機系統實驗室 2007/05/29. Outline. Introduction Goals Methods
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Paper ReviewContribution of the extrinsic and intrinsic hand muscles to the moments in finger jointsZ.M. Li, V.M. Zatsiorsky, M.L. LatashClinical Biomechanics 15(2000) 學號:N16941703 學生: 洪振翔 指導教授: 朱銘祥 林宙晴 實驗室:人機系統實驗室 2007/05/29
Outline • Introduction • Goals • Methods • Modeling • Results • Discussion
Introduction(1) • Extrinsic muscles: originate outside the hand. - responsible for the primary functioning in a variety of tasks - extensor、flexor • Intrinsic muscles: originate and insert within the hand. -provide necessary balance and fine tuning of the multi-joints system
Introduction(2) • In clinical practice the force of FDP is estimated subjectively. • If we want to calculate the moments at the finger joints in static conditions, both the magnitude and direction of the external force must known. • In this study, a novel measuring system (the suspension system) was developed.
Goals • To develop a method of estimating force produced by the flexor digitorum profundus (FDP), flexor digitorum superficialis (FDS) and intrinsic muscles (INT). • To estimate the contribution of these muscles to the finger joint moments.
Methods • Apparatus -the suspension system • Ten right-handed male • Experimental procedure 1. three location -ExpDP, ExpDIP, ExpPIP 2. press down maximally -the interphalangeal joints are fully extended 3. EMG of EDC (extensor digitorum communis)
Modeling(1) • Finger joint moment • Muscles counterbalancing an external finger moment at the joints at different loop positions
Modeling(2) • Analysis of muscle forces and their contribution to joint moment
Results(1) • Contribution of muscle groups to joint moments For ExpDP, For ExpDP, For ExpDIP,
Results(2) • Muscle forces The maximal forces produced by individual muscles depended on the experimental condition.
Discussion(1) • The “suspension” design in this study is advantageous in that the orientation of force application can be pre-specified. • In this study the fingers were extended and the force was applied at the middle of the distal phalanx which might be similar to the pulp pinch posture. • In the model, the contribution of the INT to the extensor mechanism at the PIP and DIP joints was neglected.
Discussion(2) • The dorsal and palmar interossei and lumbricals were lumped together and viewed a single muscle that produced a moment solely at the MCP joint. • The assumption is justified because in the experiments the fingers were extended. • As a result, the effects of extensor mechanism are relatively small when the point of force application is at distal position.