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The Geomedic knee prosthesis. A long-term follow-up study
C J van Loon1, H P Hu, J R Van Horn
1Institute of Orthopedic Surgery, St Radboud Hospital, University of Nijmegen, The Netherlands.
Acta Orthopaedica Belgica
|January 1, 1993
Summary
Long-term follow-up of Geomedic total knee arthroplasty shows 78% survival at 13 years. Tibial loosening was the primary reason for revision surgery in this patient cohort.
Area of Science:
- Orthopedic Surgery
- Biomaterials Science
Background:
- Total knee arthroplasty (TKA) is a common procedure for end-stage knee arthritis.
- The Geomedic prosthesis is a specific TKA design with a long history.
- Long-term outcomes data are crucial for evaluating implant performance and patient satisfaction.
Purpose of the Study:
- To evaluate the long-term clinical and radiographic outcomes of the Geomedic total knee arthroplasty.
- To determine the survival rate and identify reasons for failure in a large patient cohort.
Main Methods:
- Retrospective long-term follow-up study.
- Involved 189 Geomedic TKAs in 143 patients (rheumatoid arthritis and osteoarthritis).
- Clinical examination of 57 knees (average 11-year follow-up) and radiographic assessment of 81 knees (mean 10.5-year follow-up).
Main Results:
- 70% of clinically examined knees were painless.
- Lucent lines at the tibial bone-cement interface observed in 62% of radiographs.
- 18% of prostheses (34 knees) were removed, mainly due to tibial component loosening.
- 13-year implant survival rate was 78% (endpoint: removal), and 58% when including radiographic loosening.
Conclusions:
- The Geomedic TKA demonstrated a 13-year survival rate of 78% with implant removal as the endpoint.
- Tibial component loosening is a significant factor affecting the long-term success of this prosthesis.
- While many patients experienced pain relief, radiographic signs of loosening were common.