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[CLS multicenter study--8-year results]

K Bläsius1, H Cotta, U Schneider

  • 1Abt. Orthopädie des Bethlehem-Krankenhauses, Stolberg.

Zeitschrift Fur Orthopadie Und Ihre Grenzgebiete
|November 1, 1993
PubMed
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This study on cementless CLS press-fit stems found excellent results in 91% of patients. The uncemented hip implants demonstrated proximal load induction, with a femor component loosening incidence below 1%.

Area of Science:

  • Orthopedic surgery
  • Biomaterials engineering
  • Medical device technology

Background:

  • The established theory of proximal fixation for cementless endoprostheses guides implant design.
  • Understanding the long-term performance of uncemented hip implants is crucial for patient outcomes.

Purpose of the Study:

  • To evaluate the clinical and radiological outcomes of cementless CLS press-fit stems.
  • To assess the principle of proximal load induction in uncemented femoral components.

Main Methods:

  • Multi-center study involving 22 clinics.
  • Clinical and radiological follow-up of 1830 patients implanted between 1984 and 1992.
  • Evaluation using the Merle d'Aubigné score with computer documentation.

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Main Results:

  • 91% of patients achieved good or excellent clinical results.
  • Femoral component loosening incidence was less than 1% over an average follow-up of 2.5 years.
  • Analysis of cases with scores below 14 was performed.

Conclusions:

  • Medium-term results confirm the efficacy of the uncemented CLS press-fit stem.
  • The study validates the concept of proximal load induction on the femur with cementless implants.
  • Cementless hip arthroplasty demonstrates favorable outcomes and low loosening rates.