Related Experiment Video
Updated: Mar 8, 2026
09:31
Individualized Stem-positioning in Calcar-guided Short-stem Total Hip Arthroplasty
Published on: February 27, 2018
12.5K
Uncemented custom-made femoral components
1Department of Orthopaedics, Musgrave Park Hospital, Stockmans Lane, Belfast - UK.
Summary
Custom cementless hip implants in young patients showed a high failure rate due to aseptic loosening. This study found the custom femoral prosthesis led to unacceptable outcomes, prompting discontinuation of its use.
Area of Science:
- Orthopedic Surgery
- Biomaterials Engineering
- Medical Device Design
Background:
- Custom-made femoral prostheses aim to improve fit and fixation in total hip replacement (THR).
- Smooth titanium alloy stems were utilized in cementless THR for younger patients.
Purpose of the Study:
- To evaluate the clinical outcomes and failure rates of custom-made, cementless femoral prostheses in younger patients.
- To assess the long-term efficacy and potential complications associated with this custom implant design.
Main Methods:
- Pre-operative radiographs and computer analysis were used to create custom femoral stems.
- Fifty-one cementless implants were performed in 43 patients between 1993 and 1996.
- Follow-up averaged 47 months, with analysis of revision rates and reasons for failure.
Main Results:
- A high revision rate of 35.3% was observed within an average of 47 months post-surgery.
- Aseptic loosening was the primary cause of failure, accounting for 13 of 16 revisions.
- Adequate bone on-growth or in-growth was not achieved with this implant design.
Conclusions:
- The custom-made, cementless femoral prosthesis demonstrated an unacceptably high failure rate.
- Despite achieving "fit and fill," the implant failed to promote sufficient bone integration.
- The use of this specific custom implant was discontinued in 1996 due to poor clinical results.
