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JOINT MOTION AND SURFACE CONTACT AREA RELATED TO COMPONENT POSITION IN TOTAL HIP ARTHROPLASTY

R. P. Robinson, MD, FACS, Orthopaedic Surgeon1; P. T. Simonian, MD, Resident Orthopaedic Surgeon2; I. M. Gradisar, BA, Research Technician1; and R. P. Ching, PhD, Research Faculty2

1 Section of Orthopaedics, Virginia Mason Medical Center, 1100 9th Avenue, Seattle, Washington 98101, USA.
2 Department of Orthopaedics RK-10, University of Washington Medical Center, 1959 NE Pacific Street, Seattle, WA98195, USA.

Correspondence should be sent to Dr R. P. Robinson.

A three-dimensional computer model of a total hip replacement was used to examine the relationship between the position of the components, the range of motion and the prosthetic joint contact area. Horizontal acetabular positions with small amounts of acetabular and femoral anteversion provide the largest contact areas, but result in limited joint movement.

These data will allow surgeons to select implant positions that will provide the largest possible joint contact area for a given joint range of motion although these are conflicting goals. In some component positions a truncated spherical prosthetic head resulted in smaller contact areas than a completely spherical head.




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A computer model of the position of the combined component in the prevention of impingement in total hip replacement
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[Abstract] [Full Text] [PDF]


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Registered charity no: 209299     Print ISSN: 0301-620X
Hip, Knee, Trauma, Upper limb, Foot & Ankle, Paediatrics, Oncology, Spine, Arthroplasty, General