Related Experiment Videos
[Intermediate-term results with the Mecron screw cup acetabulum--a follow-up study]
1Orthopädische Klinik und Poliklinik der Rheinischen Friedrich-Wilhelms-Universität Bonn.
Zeitschrift Fur Orthopadie Und Ihre Grenzgebiete
|October 31, 1998
Summary
The Mec-Ring titan screw cup showed a low survival rate, with 34.2% removed and 19.8% failing due to loosening. These cementless hip implants are not recommended for future use.
Area of Science:
- Orthopedic surgery
- Biomaterials science
- Medical device engineering
Context:
- Cementless acetabular cups are widely used in hip replacement surgery.
- Titanium screw cups (Mec-Ring type) showed promising short-term results.
- Middle-term survival rates of these implants were previously unevaluated.
Purpose:
- To evaluate the middle-term survival rate of cementless Mec-Ring titan screw cups.
- To compare the implant survival rate with other fixation methods.
- To determine the clinical outcomes and failure modes of these implants.
Summary:
- A retrospective study followed 111 Mec-Ring acetabular cups implanted in 85 patients for an average of 6.7 years.
- Implant failure occurred in 34.2% (removed) and an additional 19.8% (radiologically loose), leading to low survival rates (69% or 54% at 7 years).
- Despite some implants showing good clinical scores, frequent X-rays are needed for early detection of loosening, and the overall survival rate is considered too low.
Impact:
- The study indicates a need for frequent radiographic monitoring to detect early bone loosening and plan revisions.
- The low survival rate suggests that Mec-Ring titan screw cups should be discontinued.
- Findings contribute to the understanding of long-term performance of cementless acetabular components in hip arthroplasty.