Secondary Logo

Journal Logo

Ivko Joseph J. Sr.
JPO Journal of Prosthetics and Orthotics: Winter 1999
Technical Forum: PDF Only
Free

ABSTRACTThis article discusses a new design in achieving humeral rotation in the bodypowered prosthesis for the transhumeral bilateral and unilateral amputees. The humeral rotator (H.R.) unit has the ability to rotate 220°: 165° to the medial range and 55° to the lateral range. It affords positive locking in all positions to overcome side pressures. Side pressure is any force that causes the prosthetic arm to involuntarily move to the medial or lateral side.Working models have been constructed and tested to evaluate the concept. The result was a 75% improvement in function, efficiency, and appearance. To increase the independence of a transhumeral amputee, it is recommended that the H.R. unit be used whenever possible.

This article discusses a new design in achieving humeral rotation in the bodypowered prosthesis for the transhumeral bilateral and unilateral amputees. The humeral rotator (H.R.) unit has the ability to rotate 220°: 165° to the medial range and 55° to the lateral range. It affords positive locking in all positions to overcome side pressures. Side pressure is any force that causes the prosthetic arm to involuntarily move to the medial or lateral side.

Working models have been constructed and tested to evaluate the concept. The result was a 75% improvement in function, efficiency, and appearance. To increase the independence of a transhumeral amputee, it is recommended that the H.R. unit be used whenever possible.

© 1999 American Academy of Orthotists & Prosthetists