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Does acetabular retroversion affect range of motion after total hip arthroplasty?
Stephen J Incavo1, Jonathan E Gold, Jesse James F Exaltacion
1Department of Orthopaedic Surgery, Adult Reconstructive Surgery, The Methodist Hospital for Orthopaedics, 6550 Fannin, Suite 2500, Houston, TX 77030, USA. SJIncavo@tmhs.org
Clinical Orthopaedics and Related Research
|July 29, 2010
Summary
Surface replacement arthroplasty (SRA) may lead to poor range of motion (ROM) in hips with acetabular retroversion. Total hip arthroplasty (THA) offers better ROM, especially with increased femoral anteversion.
Area of Science:
- Orthopedic Surgery
- Biomechanics
- Biomedical Engineering
Background:
- Acetabular retroversion is increasingly identified in hip arthroplasty patients.
- This condition poses challenges for prosthetic component positioning in the anatomic position.
Purpose of the Study:
- To compare the range of motion (ROM) between surface replacement arthroplasty (SRA) and total hip arthroplasty (THA) in retroverted acetabula.
- To determine if increased femoral anteversion improves ROM in retroverted acetabula.
Main Methods:
- Utilized a motion analysis tracking system on eight cadaveric hips.
- Created virtual CT-reconstructed bone models for ROM determination.
- Virtually implanted SRA and THA systems, simulating acetabular retroversion and femoral stem anteversion.
Main Results:
- SRA showed significant ROM deficiencies (25-29%) in normal and retroverted positions.
- THA restored ROM in most positions, with only minor deficits (5%) in retroverted acetabula.
- Increased femoral stem anteversion further improved THA ROM, with only a 2% deficiency in one position.
Conclusions:
- Surface replacement arthroplasty can result in poor range of motion when acetabular retroversion is present.
- Total hip arthroplasty demonstrates superior ROM outcomes in retroverted acetabula, particularly when combined with increased femoral anteversion.