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Bone imaging after cementless press fit total hip arthroplasty
1Department of Nuclear Medicine, Maisonneuve Hospital, Montreal, Canada.
Clinical Nuclear Medicine
|August 1, 1989
Summary
Cementless hip implants are increasingly used due to loosening issues with cemented types. This study tracked bone stress and graft incorporation after cementless hip arthroplasty using bone imaging.
Area of Science:
- Orthopedic surgery
- Biomedical engineering
- Radiology
Background:
- Conventional cemented hip prostheses exhibit high rates of loosening.
- Cementless implants are gaining popularity in Europe and North America.
- Smooth-surfaced "press fit" prostheses aim for autolocking in the femoral canal.
Purpose of the Study:
- To define the "normal" distribution of mechanical stress around cementless hip implants.
- To assess the incorporation of bone allografts in revision hip surgery.
- To evaluate the long-term stability and bone integration of cementless hip arthroplasty.
Main Methods:
- Prospective follow-up of fifteen patients.
- Bone imaging using Technetium-99m methylene diphosphonate (Tc-99m MDP).
- Three-month imaging intervals post-cementless hip arthroplasty.
Main Results:
- Established baseline for "normal" mechanical stress distribution in the surrounding bone.
- Demonstrated bone allograft incorporation in revision surgery cases.
- Provided imaging data on bone-implant interface and stress patterns.
Conclusions:
- Understanding normal stress distribution is crucial for cementless implant success.
- Bone allografts show incorporation, aiding reconstruction in revision cases.
- Tc-99m MDP imaging is valuable for monitoring cementless hip arthroplasty outcomes.