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Updated: Jul 5, 2026

Individualized Stem-positioning in Calcar-guided Short-stem Total Hip Arthroplasty
09:31

Individualized Stem-positioning in Calcar-guided Short-stem Total Hip Arthroplasty

Published on: February 27, 2018

CBC Mathys and CLS Spotorno stems: similar in design, different in outcomes. A comparative study of clinical and

Paula Bazán1, Adrián Torres2, Jorge Gómez-Álvarez3,1

  • 1University of Navarra, Pamplona, Spain.

Archives of Orthopaedic and Trauma Surgery
|June 23, 2025
PubMed

Insights

The CBC Mathys hip stem showed more bone overgrowth and radiolucency than the CLS Spotorno stem. These differences suggest varied biomechanical responses and a slightly lower survival rate for the CBC Mathys stem over six years.

Area of Science:

  • Orthopedic Surgery
  • Biomaterials Science
  • Radiology

Background:

  • Total hip arthroplasty (THA) is a common procedure for hip joint restoration.
  • Non-cemented tapered stems, including CBC Mathys and CLS Spotorno, are widely utilized.
  • Understanding biomechanical differences between these stems is crucial for optimizing patient outcomes.

Purpose of the Study:

  • To compare clinical and radiological outcomes between the CBC Mathys and CLS Spotorno non-cemented hip stems.
  • To evaluate differences in cortical hypertrophy, radiolucency, stem subsidence, and implant survival.
  • To identify potential biomechanical and tissue response variations between the two implant designs.

Main Methods:

  • A retrospective 1:1 matched cohort study of 344 total hip arthroplasty patients.
  • Radiological assessment of cortical hypertrophy, radiolucency, and stem subsidence using specialized software.
  • Clinical outcomes measured using the Merlé-D'Aubigné scale and implant survival analyzed with Kaplan-Meier curves.

Main Results:

  • The CBC Mathys stem showed significantly higher rates of cortical hypertrophy (42.4% vs. 4.6%) and radiolucency (55.2% vs. 18.6%) compared to the CLS Spotorno stem.
  • No significant difference in stem subsidence was observed between the two groups.
  • The CBC Mathys stem had a slightly lower survival rate (97.6% vs. 100%) over six years, with revisions for aseptic loosening.

Conclusions:

  • The CBC Mathys stem demonstrates distinct biomechanical and tissue responses compared to the CLS Spotorno stem, evidenced by increased cortical hypertrophy and radiolucency.
  • These radiological findings are observable early, often within the first year post-implantation.
  • Further investigation into the long-term clinical implications of these observed differences is warranted.
Abstract

Keywords:
CBC Mathys stemCLS Spotorno stemCortical hypertrophyRadiolucencyStem survivalTotal hip arthroplasty

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