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Related Experiment Videos

Dislocation after long-necked total hip arthroplasty.

R L Lawton1, B F Morrey

  • 1Mayo Clinic and Mayo Foundation, Rochester, MN 55905, USA.

Clinical Orthopaedics and Related Research
|June 10, 2004
PubMed
Summary
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Long-necked hip implants increase dislocation risk after total hip arthroplasty (THA). This study found higher dislocation rates in primary and revision THA cases using long-necked implants compared to standard ones.

Area of Science:

  • Orthopedic Surgery
  • Biomedical Engineering

Background:

  • Dislocation is a significant complication following total hip arthroplasty (THA).
  • Skirted long-necked femoral prostheses are designed to improve soft tissue tension and reduce dislocation risk.

Purpose of the Study:

  • To investigate whether long-necked femoral prostheses have different dislocation rates compared to standard neck length implants in THA.
  • To compare dislocation rates and leg length discrepancies between long-necked and standard neck length implants.

Main Methods:

  • Retrospective review of 250 total hip arthroplasties (125 primary, 125 revision) using long-necked femoral prostheses.
  • Matched control group with standard neck length prostheses.
  • Comparison of dislocation rates and radiographic leg length indices.

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Main Results:

  • Dislocation rates were 10.6% for primary and 18% for revision THA with long-necked implants.
  • These rates were significantly higher than the control group (1.6% primary, 10% revision).
  • No significant difference in leg length discrepancy was observed between the groups.

Conclusions:

  • Long-necked femoral prostheses are associated with increased rates of dislocation after THA.
  • Potential contributing factors include neck impingement and inadequate soft tissue tension restoration.
  • An association between skirted long necks and higher dislocation rates is evident.