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Weight-bearing radiography depends on limb loading.

Robert Karl Zahn1,2, Lisa Renner3, Carsten Perka3

  • 1Center for Musculoskeletal Surgery, Charité, University Medicine Berlin, Charitéplatz 1, 10117, Berlin, Germany. robert.zahn@charite.de.

Knee Surgery, Sports Traumatology, Arthroscopy : Official Journal of the ESSKA
|July 12, 2018
PubMed
Summary

Following total knee arthroplasty (TKA), the mechanical axis alignment significantly correlates with limb loading. Accurate assessment requires full weight-bearing and complete extension in long-leg radiographs.

Keywords:
Limb loadingMechanical axisStanding long-leg radiographsTotal knee arthroplastyTotal knee replacement

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Area of Science:

  • Orthopedic surgery
  • Biomechanics
  • Radiology

Background:

  • The mechanical axis of the lower limb can change with weight-bearing and after total knee arthroplasty (TKA).
  • Understanding alignment changes post-TKA is crucial for patient outcomes.

Purpose of the Study:

  • To investigate the correlation between lower limb mechanical axis alignment and limb loading after TKA.
  • To assess how alignment changes in standing long-leg radiographs relate to weight distribution post-surgery.

Main Methods:

  • Prospective evaluation of mechanical axis and limb loading in 115 patients post-TKA (10 days and 3 months).
  • Standing long-leg radiographs used for mechanical axis analysis.
  • Digital scales measured individual limb loading during radiography.

Main Results:

  • A significant shift in mechanical axis from valgus to varus alignment was observed (p < 0.01).
  • Limb loading increased from 89.9% to 93.0% (p < 0.01), strongly correlating with mechanical axis (r=0.804, p<0.001; r=0.562, p<0.001).
  • These changes were more pronounced in patients with incomplete knee extension post-surgery.

Conclusions:

  • Postoperative mechanical axis alignment is directly correlated with limb loading after TKA.
  • Clinically significant changes in frontal alignment are linked to increased limb loading.
  • Accurate mechanical axis assessment necessitates physiological loading with complete extension in long-leg radiographs.