Med Biol Eng Comput - Towards the development of a novel experimental shoulder simulator with rotating scapula and individually controlled muscle forces simulating the rotator cuff.

Tópicos

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Resumo

A preclinical analysis of novel implants used in shoulder surgery requires biomechanical testing conditions close to physiology. Existing shoulder experiments may only partially apply multiple cycles to simulate postoperative, repetitive loading tasks. The aim of the present study was therefore the development of an experimental shoulder simulator with rotating scapula able to perform multiple humeral movement cycles by simulating individual muscles attached to the rotator cuff. A free-hanging, metallic humerus pivoted in a polyethylene glenoid is activated by tension forces of linear electroactuators to simulate muscles of the deltoideus (DELT), supraspinatus (SSP), infraspinatus/teres minor and subscapularis. The abductors DELT and SSP apply forces with a ratio of 3:1 up to an abduction angle of 85?. The rotating scapular part driven by a rotative electro actuator provides one-third to the overall arm abduction. Resulting joint forces and moments are measured by a 6-axis load cell. A linear increase in the DELT and SSP motors is shown up to a maximum of 150 and 50?N for the DELT and SSP, respectively. The force vector in the glenoid resulted in 253?N at the maximum abduction. The present investigation shows the contribution of individual muscle forces attached to the moving humerus to perform active abduction in order to reproducibly test shoulder implants.

Resumo Limpo

preclin analysi novel implant use shoulder surgeri requir biomechan test condit close physiolog exist shoulder experi may partial appli multipl cycl simul postop repetit load task aim present studi therefor develop experiment shoulder simul rotat scapula abl perform multipl humer movement cycl simul individu muscl attach rotat cuff freehang metal humerus pivot polyethylen glenoid activ tension forc linear electroactu simul muscl deltoideus delt supraspinatus ssp infraspinatuster minor subscapulari abductor delt ssp appli forc ratio abduct angl rotat scapular part driven rotat electro actuat provid onethird overal arm abduct result joint forc moment measur axi load cell linear increas delt ssp motor shown maximum n delt ssp respect forc vector glenoid result n maximum abduct present investig show contribut individu muscl forc attach move humerus perform activ abduct order reproduc test shoulder implant

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