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The Journal of Bone and Joint Surgery, Vol 70, Issue 1 45-50, Copyright © 1988 by Journal of Bone and Joint Surgery, Inc
Telemetric force measurements across the hip after total arthroplasty
DT Davy, GM Kotzar, RH Brown, KG Heiple, VM Goldberg, KG Heiple, J Berilla and AH Burstein
Department of Mechanical and Aerospace Engineering, Case Western Reserve University, Cleveland, Ohio 44104.
A telemeterized total hip prosthesis was implanted in one patient and
force-data were obtained. Thirty-one days postoperatively, the magnitude of
the joint-contact force during double-limb stance was 1.0 times body
weight. During ipsilateral single-limb stance the joint-contact force was
2.1 times body weight, and during the stance phase of gait the peak force
typically was 2.6 to 2.8 times body weight, with the resultant force
located on the anterosuperior portion of the ball. During stair-climbing,
the force was 2.6 times body weight. At peak loads, the angle between the
resultant force and the axis of the neck was 30 to 35 degrees and that
between the resultant force and the plane of the prosthesis was 20 degrees.
During stair-climbing or straight-leg raising, the out-of-plane orientation
of the resultant force increased substantially. These data provide
information concerning the forces that must be sustained by prosthetic hip
joints during a number of common activities of daily living within the
first month after implantation. The results also provide insight into the
progression of early recovery and demonstrate the variety of forces that
are generated during this period.
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