Increased range of motion to impingement with large head total hip arthroplasty: point of diminishing returns. Academic Article uri icon

Overview

abstract

  • Large head total hip arthroplasty (THA) is known to increase range of motion to impingement and decrease risk of dislocation, however, this is dependent on accurate component positioning and patient anatomy. In this study, a computer-aided design model was used to determine the effects of component positioning on range of motion to impingement with increasing head size. Three-dimensional models were made of 7 cadaver CT scans and virtual THA was performed with a conventional implant system. Theoretical range of motion to impingement was tested before and after the components were implanted in flexion, extension, internal/external rotation, abduction, adduction, and flexed internal/external rotation. Range of motion increased non-linearly in every motion except for external rotation and adduction with increasing head size, with gains in ROM limited by osseous impingement. Use of large head THA leads to increased ROM to impingement, but with larger head sizes, benefits are limited by bony anatomy.

publication date

  • January 1, 2012

Research

keywords

  • Arthroplasty, Replacement, Hip
  • Hip Joint
  • Hip Prosthesis
  • Prosthesis Failure
  • Range of Motion, Articular

Identity

Scopus Document Identifier

  • 84864003576

Digital Object Identifier (DOI)

  • 10.5301/HIP.2012.9285

PubMed ID

  • 22773504

Additional Document Info

volume

  • 22

issue

  • 3