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The Journal of Bone and Joint Surgery (American) 83:S87-91 (2001)
© 2001 The Journal of Bone and Joint Surgery, Inc.

Scientific Article

Optimizing Acetabular Component Position to Minimize Impingement and Reduce Contact Stress

Darryl D. D'Lima, MD, Peter C. Chen, PhD and Clifford W. Colwell, Jr., MD

Darryl D. D’Lima, MD
Peter C. Chen, PhD
Clifford W. Colwell Jr., MD
Division of Orthopaedic Surgery, Scripps Clinic, MS126, 11025 North Torrey Pines Road, Suite 140, La Jolla, CA 92037. E-mail address for D.D. D’Lima: ddlima@scripps.edu. E-mail address for C.W. Colwell Jr.: colwell@scripps.edu

The authors did not receive grants or outside funding in support of their research or preparation of this manuscript. They did not receive payments or other benefits or a commitment or agreement to provide such benefits from a commercial entity. No commercial entity paid or directed, or agreed to pay or direct, any benefits to any research fund, foundation, educational institution, or other charitable or nonprofit organization with which the authors are affiliated or associated.

The first 150 words of the full text of this article appear below.


   Introduction
 
Component impingement due to poor positioning can limit range of motion after total hip arthroplasty. Contact stresses on ultra-high molecular weight polyethylene are also dependent on the orientation of the acetabular component. In this study, a computer kinematic model was used to determine the effects of component position and variation of head:neck ratios on prosthetic impingement and hip range of motion, and a finite element model was employed to calculate polyethylene stresses at different cup positions.


   Materials and Methods
 
Kinematic Analysis
A three-dimensional total hip prosthesis with a hemispherical acetabular cup, femoral neck diameters ranging from 10 to 12 mm, and head sizes ranging from 22 to 32 mm was generated (Fig. 1). The maximum range of motion of the hip was measured, before impingement of the neck on the cup liner, for acetabular component abduction angles ranging from 35° to 55° and for acetabular component anteversion angles ranging from 0° to 30°. . . . [Full Text of this Article]


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