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Related Experiment Videos

Uncemented total hip replacements using the Mecron acetabular cup--a prospective study

H H Lim1, D M Hunt

  • 1Department of Orthopaedics, St Mary's Hospital, London, United Kingdom.

Annals of the Academy of Medicine, Singapore
|July 1, 1997
PubMed
Summary

The Mecron acetabular threaded cup showed poor short-term results in primary total hip replacements, with 5 revisions due to loosening. Migration and tilting led to the prosthesis being abandoned.

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Area of Science:

  • Orthopedic surgery
  • Biomaterials science
  • Medical device engineering

Background:

  • Uncemented threaded cups have gained popularity for hip replacements.
  • The Mecron acetabular threaded cup system was evaluated for primary hip arthroplasty.

Purpose of the Study:

  • To assess the short-term outcomes of the Mecron acetabular threaded cup system in primary total hip replacements.
  • To identify failure modes and complications associated with this specific implant.

Main Methods:

  • A series of 104 primary total hip replacements using the Mecron acetabular cup and Ring system femoral stem were performed between 1987 and 1991.
  • Patients were followed annually for up to 4 years, with assessments including the modified Harris score and radiographic analysis.

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Main Results:

  • Five hips (4.8%) required revision surgery, all due to acetabular loosening.
  • 60.6% of cases had excellent or good short-term results, while 18.3% had poor results.
  • Radiographic evaluation revealed migration and tilting of the acetabular cup in all cases; heterotopic bone formation occurred in 10 patients.

Conclusions:

  • The Mecron acetabular cup demonstrated significant issues with loosening, migration, and tilting, leading to its discontinuation.
  • These findings highlight the importance of implant design and fixation in achieving long-term success in total hip arthroplasty.