Three Practical Methods for Estimating Preoperative Cardiorespiratory Fitness in Patients With Severe Hip or Knee Osteoarthritis: A Cross‐Sectional Study
Authors' conclusion
These simple, practical, cost-effective tools have utility for estimating preoperative fitness to rule out low fitness.
Study context
- Population
- Patients with severe hip or knee OA scheduled for total joint arthroplasty, tested within 1 week before surgery
- Participants
- 91 patients
- Exposure
- Duke Activity Status Index, daily step count and timed up and go test vs directly measured cardiorespiratory fitness (cardiopulmonary exercise testing)
- Outcome
- Ability of indirect tools to estimate directly measured cardiorespiratory fitness and identify low preoperative fitness (<15 mL/kg/min)
- Follow-up
- Within 1 week before surgery
Main finding
As reported in the abstract
Estimation of peak V̇O2 by indirect tools
All three indirect tools provided strong estimates of peak V̇O2
r2 ≥ 0.61
Duke Activity Status Index slightly underestimated peak V̇O2
0.9 mL/kg/min
Observational data: associations, not effects.
Parts of this Brief are withheld: the automatic checks could not confirm them against the abstract.
Original publication
Three Practical Methods for Estimating Preoperative Cardiorespiratory Fitness in Patients With Severe Hip or Knee Osteoarthritis: A Cross‐Sectional Study. Arthritis Care Res (Hoboken). Published 2 February 2026. doi:10.
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