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Updated: Jun 10, 2026
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Potentiodynamic Corrosion Testing
Published on: September 4, 2016
Analyses of prosthesis stem failures in noncemented modular hip revision prostheses
1Department of Orthopaedics and Rheumatology, University Hospital Marburg, Germany.
The Journal of Arthroplasty
|July 17, 2010
Summary
Mechanical failure in non-cemented modular hip revision stems is rare but serious. This study reports four such failures, highlighting the need for vigilance regarding implant integrity and patient awareness.
Area of Science:
- Orthopedic surgery
- Biomaterials engineering
- Implant failure analysis
Background:
- Modular revision systems are crucial for hip prosthesis revision surgery.
- Non-cemented modular revision stems are increasingly used.
- Mechanical failure of these stems, though rare, is a significant concern.
Observation:
- Four cases of mechanical failure in non-cemented modular revision stems were observed over 28 months.
- Failures presented as severe inguinal or thigh pain, confirmed by X-ray.
- Fractures occurred below the prosthesis stem-neck interface, a high-stress zone.
Findings:
- All four stems exhibited fatigue fractures due to dynamic stress.
- Metallographic analysis confirmed fatigue fracture in one case.
- Loosening at the proximal component was evident in all failures.
Implications:
- Clinicians must consider implant failure in patients experiencing new pain after revision with modular non-cemented stems.
- Enhanced surveillance for implant failure is warranted.
- Informed patient consent regarding the risk of implant failure is essential.
