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From the Department of Orthopedic Surgery, State University of Iowa, Iowa City, Iowa
1965 by The Journal of Bone and Joint Surgery, Incorporated
J Bone Joint Surg Am, 1965 Apr 01;47(3):462-476
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1. A dried, male pelvis articulated with the lower two lumbar vertebrae and femur were positioned to represent the situation present when a man is standing on one extremity. The abductor muscles (gluteus minimus, gluteus medius, and tensor fasciae latae, and iliotibial tract) were represented by chains and load cells designed to incorporate SR-4 strain gauges.

2. The model was loaded at the approximate center of gravity of the body with different weights and different hip positions to determine the counterforce on the load cells and thereby an approximation of the force exerted by the abductor muscles of the hip under the conditions tested.

3. The results by this method agreed within 4 per cent with the theoretical values calculated from a roentgenogram of the same model.

4. On the model the total abductor muscle force for a 150-pound man was found to be 154 pounds.

5. Superincumbent body weight should be used for all calculations rather than total body weight.

6. Abductor-muscle force is least with the pelvis in abduction and most with the pelvis in adduction.

7. Rotation of the femur internally or externally from its anatomical or neutral position necessitates increased abductor-muscle force to maintain a level pelvis.

8. The theory that abnormal gait patterns associated with rotational deformities of the femur represent the most efficient use of the hip abductor mechanism was supported by the findings.

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    These activities have been planned and implemented in accordance with the Essential Areas and policies of the Accreditation Council for Continuing Medical Education (ACCME) through the joint sponsorship of the American Academy of Orthopaedic Surgeons and The Journal of Bone and Joint Surgery, Inc. The American Academy of Orthopaedic Surgeons is accredited by the ACCME to provide continuing medical education for physicians.
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