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Related Experiment Videos

The CLS system. Theoretical concept and results

L Spotorno1, S Romagnoli, N Ivaldo

  • 1Divisione Ortopedico-Traumatologica, Unita Sanitaria locale, Pietra Ligure, Italy.

Acta Orthopaedica Belgica
|January 1, 1993
PubMed
Summary

The CLS femoral prosthesis, an uncemented hip implant, demonstrates stable fixation without bone ingrowth or complete canal fill. This study highlights its effectiveness in hip replacement surgery.

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Area of Science:

  • Orthopedic Surgery
  • Biomaterials Engineering
  • Medical Device Design

Background:

  • The CLS femoral prosthesis is a titanium stem with a 3D taper for press-fit implantation.
  • Its design features a small distal part, bead-blasted surface without bone ingrowth features, and proximal ribs to minimize rotational migration.
  • The CLS acetabular component is a 6-sided expanding cup for press-fit stabilization.

Purpose of the Study:

  • To evaluate the indications for use of the CLS hip prosthesis system.
  • To report clinical and radiographical outcomes of CLS stem implantation.
  • To assess the necessity of bone ingrowth and distal fit for stable uncemented stem fixation.

Main Methods:

  • Review of clinical and radiographical data from 300 CLS stems implanted between 1983 and 1985.

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  • Average follow-up period of 82 months.
  • Analysis of fixation stability in uncemented femoral stems.

    • Main Results:

    • The CLS femoral prosthesis utilizes a press-fit implantation technique.
    • Proximal ribs are incorporated to reduce rotational migration.
    • A review of 300 implants showed stable secondary fixation was achieved without bone ingrowth or distal fit.

    Conclusions:

    • Bone ingrowth is not essential for stable secondary fixation of the CLS uncemented femoral stem.
    • Distal fit and fill of the intramedullary canal are not required for achieving stable fixation.
    • The CLS system provides a viable option for uncemented hip arthroplasty.