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[The isoelastic RM hip endoprosthesis]
Zeitschrift Fur Orthopadie Und Ihre Grenzgebiete
|November 1, 1993
Summary
Long-term results of 211 cementless RM Total Hip Replacements show significant radiolucent lines. After 9.1 years, nearly 20% of cups and 30% of stems had lines over 2 mm.
Area of Science:
- Orthopedic Surgery
- Biomaterials Science
Background:
- The study evaluates the long-term performance of cementless RM Total Hip Replacements.
- The "Isoelasticity" principle and implant design (cup and stem) are key features.
Purpose of the Study:
- To present long-term results of 211 cementless isoelastic RM Total Hip Replacements implanted between 1980 and 1986.
- To compare study outcomes with the Merle d'Aubigné classification scheme.
Main Methods:
- A cohort of 211 patients received cementless isoelastic RM Total Hip Replacements.
- Follow-up included a questionnaire and study adhering to SICOT, AAOS, and HIP society recommendations.
- Radiolucent lines were assessed after an average of 9.1 years.
Main Results:
- Significant differences were observed when compared to the Merle d'Aubigné scheme.
- Radiolucent lines exceeding 2 mm were found in 19.3% of cups.
- Radiolucent lines exceeding 2 mm were found in 30.8% of stems.
Conclusions:
- The long-term performance of these specific cementless hip replacements requires careful consideration.
- A substantial percentage of implants showed radiolucent lines, indicating potential long-term concerns.