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The Journal of Bone and Joint Surgery, Vol 61, Issue 5 639-652, Copyright © 1979 by Journal of Bone and Joint Surgery, Inc
Reconstruction of the hip. A mathematical approach to determine optimum geometric relationships
RC Johnston, RA Brand and RD Crowninshield
The normal mechanical function of the hip is substantially altered by a
variety of disorders. The surgical treatment of such conditions,
particularly total hip replacement, offers the opportunity not only to
replace the articular surfaces of the joint, but also to improve long-term
mechanical function by reducing the loads on the joint. A mathematical
model of the hip was developed to evaluate the effects of such surgically
achievable mechanical alterations as acetabular placement, femoral
shaft-prosthetic neck angle, neck length of the femoral prosthesis, and
transfer of the greater trochanter. The loads on the hip were lowered
significantly by placing the center of the acetabulum as far medially,
inferiorly, and anteriorly as was anatomically feasible. Minimum joint
contact forces occurred when the femoral shaft-prosthetic neck angles were
small, while the minimum moments about the prosthesis stem-neck junction
were found when the angles were 130 to 140 degrees. A neck length of the
femoral prosthesis of thirty-five millimeters resulted in moments that were
lower than those for a neck length of forty-five millimeters. Lateral
transfer of the greater trochanter reduced hip-joint forces and moments but
distal transfer had little mechanical effect.

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