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Radiologic bone adaptations on a cementless short-stem shoulder prosthesis.

Marc Schnetzke1, Sebastian Coda2, Patric Raiss3

  • 1BG Trauma Center Ludwigshafen at the University of Heidelberg, Heidelberg, Germany.

Journal of Shoulder and Elbow Surgery
|November 13, 2015
PubMed
Summary

Radiologic bone adaptations after cementless short-stem shoulder arthroplasty showed no loosening or subsidence. Higher bone filling ratios were linked to increased bone adaptations, without affecting clinical outcomes.

Keywords:
Total shoulder arthroplastybone adaptationsbone resorptionfilling ratiometaphyseal fixationshort stemstress shielding

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Area of Science:

  • Orthopedic surgery
  • Biomaterials science
  • Radiology

Background:

  • Evaluating bone adaptations in cementless short-stem shoulder arthroplasty.
  • Assessing timing and location of radiologic changes.
  • Utilizing a specific short-stem prosthesis design.

Purpose of the Study:

  • To analyze radiologic bone adaptations after cementless short-stem shoulder arthroplasty.
  • To determine the relationship between bone adaptations and implant filling ratios.
  • To compare clinical outcomes based on the extent of bone adaptations.

Main Methods:

  • Radiographic analysis of 52 patients (mean age 71.6 years) with uncemented short-stem shoulder arthroplasty.
  • Minimum 2-year follow-up assessing stem inclination, filling ratios, bone remodeling, radiolucent lines, and subsidence.
  • Comparison of radiographic and clinical findings between low and high bone adaptation groups.

Main Results:

  • No loosening, subsidence, or osteolysis observed at final follow-up.
  • High bone adaptations occurred in 51.9% of patients, with cortical thinning and osteopenia being common.
  • Patients with high bone adaptations showed significantly higher metaphyseal and diaphyseal filling ratios.

Conclusions:

  • Cementless short-stem shoulder arthroplasty demonstrates favorable clinical and radiologic results comparable to standard stems.
  • Higher metaphyseal and diaphyseal filling ratios are significantly associated with increased bone adaptations.
  • Radiographic bone adaptations did not negatively influence clinical outcomes.