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Micromotion of the total knee
L A Broström1, I Goldie, G Selvik
1Department of Orthopedics, Karolinska Hospital, Stockholm, Sweden.
Acta Orthopaedica Scandinavica
|August 1, 1989
Summary
This study on gonarthrosis patients using noncemented ICLH endoprosthesis found initial micromotion in implants. However, tibial and femoral components showed minimal subsidence, suggesting good early stability for knee replacement surgery.
Area of Science:
- Orthopedic surgery
- Biomedical engineering
- Radiology
Background:
- Gonarthrosis, or osteoarthritis of the knee, is a leading cause of knee pain and disability.
- Total knee arthroplasty (TKA) is a common treatment for advanced gonarthrosis.
- Noncemented implants are increasingly used in TKA, aiming for biological fixation and improved long-term outcomes.
Purpose of the Study:
- To evaluate the early postoperative stability of noncemented all-polyethylene ICLH endoprostheses in patients with gonarthrosis.
- To assess implant micromotion and subsidence using precise radiographic techniques.
Main Methods:
- Eight patients with gonarthrosis underwent surgery with a noncemented all-polyethylene ICLH endoprosthesis.
- Postoperative radiographic examinations were performed up to 2 years.
- Roentgen stereophotogrammetric analysis (RSA) was utilized to quantify implant micromotion and subsidence.
Main Results:
- Micromotion was detected in all implanted tibial and femoral components.
- The mean subsidence for both tibial and femoral components was minimal, measuring only 0.4 mm.
- These findings indicate early osseointegration and stability despite initial micromotion.
Conclusions:
- Noncemented all-polyethylene ICLH endoprostheses demonstrate acceptable early stability in gonarthrosis treatment.
- Minimal subsidence suggests good initial fixation and potential for long-term success.
- RSA is a valuable tool for assessing the biomechanical performance of knee implants.