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Related Concept Videos

Changes in the Appendicular Skeleton with Age01:09

Changes in the Appendicular Skeleton with Age

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Design and validation of a biomechanics device for preclinical arthrofibrosis models.

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Surprisingly Low Rates of Aseptic Loosening in 575 Rotating-Hinge Total Knee Arthroplasties.

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Extended Trochanteric Osteotomy Combined with Medial Reduction Corticotomy to Correct Femoral Deformity at the Time of Revision Total Hip Arthroplasty.

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The Lower Body Positive Pressure Treadmill for Knee Osteoarthritis Rehabilitation
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Mean Body Mass Index Does Not Increase or Decrease at 10 Years After Primary Total Hip or Knee Arthroplasty.

Daniel Karczewski1, Michael W Seward, Kristin M Fruth

  • 1Department of Orthopedic Surgery, Mayo Clinic, Rochester, Minnesota.

The Journal of Bone and Joint Surgery. American Volume
|September 5, 2025
PubMed
Summary
This summary is machine-generated.

Long-term body mass index (BMI) after hip or knee replacement surgery generally does not change significantly. While many patients experience weight fluctuations, arthroplasty is not a reliable method for overall BMI improvement.

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Area of Science:

  • Orthopedic Surgery
  • Metabolic Health
  • Biostatistics

Background:

  • Patients undergoing total hip arthroplasty (THA) and total knee arthroplasty (TKA) often aim for weight loss.
  • Long-term changes in body mass index (BMI) after these procedures remain largely unknown.

Purpose of the Study:

  • To analyze BMI changes at 2, 5, and 10 years post-primary THA and TKA.
  • To identify predictors of BMI change following these joint replacement surgeries.

Main Methods:

  • Retrospective analysis of 763 patients (310 THA, 453 TKA) with osteoarthritis undergoing primary arthroplasty (2001-2011).
  • BMI data collected at surgery and at 2, 5, and 10 years postoperatively.
  • Repeated-measures ANOVA and multinomial logistic regression used for BMI change analysis and predictor identification.

Main Results:

  • Mean BMI showed a slight increase at 2 and 5 years post-THA and TKA, but returned to baseline by 10 years.
  • At 10 years, 27-30% of patients had a BMI decrease >5%, while 30-32% had a BMI increase >5%.
  • Female sex predicted a >5% BMI increase after THA; older age predicted a decrease after TKA.

Conclusions:

  • Arthroplasty does not lead to significant overall BMI improvement for most patients.
  • Individual BMI changes can be substantial (>5%) at 10 years post-surgery.
  • Demographic factors like sex and age can predict clinically significant weight changes after joint replacement.