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Related Experiment Videos

Assessing activity in joint replacement patients

C A Zahiri1, T P Schmalzried, E S Szuszczewicz

  • 1Harbor-UCLA Medical Center, Division of Orthopaedic Surgery, Torrance, California, USA.

The Journal of Arthroplasty
|January 8, 1999
PubMed
Summary

Assessing patient activity after joint replacement is crucial. While pedometers offer precise measurement, the UCLA activity score and investigator visual analog scale provide reliable, simpler clinical assessments for routine use.

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Area of Science:

  • Orthopedic surgery
  • Biomedical engineering
  • Rehabilitation medicine

Background:

  • Evaluating lower extremity joint reconstructions requires assessing patient activity levels.
  • Current methods for in vivo wear assessment of joint prostheses lack reliable patient activity measures.
  • Clinicians need simple, effective tools to gauge activity in joint replacement patients.

Purpose of the Study:

  • To compare pedometer-measured walking activity with the UCLA activity score and a visual analog scale (VAS) in 100 total joint replacement patients.
  • To determine the validity of the UCLA activity score and investigator-rated VAS for routine clinical activity assessment.
  • To identify practical methods for quantifying patient activity post-joint reconstruction.

Main Methods:

  • 100 total joint replacement patients' walking activity was quantitatively assessed using pedometers.

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  • Pedometer data was compared against the UCLA activity score and a visual analog scale (VAS) rated by the investigator.
  • Patient-rated VAS scores were also analyzed for correlation with pedometer data.

    • Main Results:

    • Both the UCLA activity rating (P = .002) and investigator-rated VAS (P = .00001) strongly correlated with pedometer-recorded steps per day.
    • Significant variability (up to 15-fold) in daily steps existed among patients with identical UCLA scores.
    • Patient-rated VAS showed a weaker correlation (P = .08) with pedometer data compared to patient age (P = .049).

    Conclusions:

    • The UCLA activity rating and investigator-rated VAS are valid tools for routine clinical assessment of activity in joint replacement patients.
    • Pedometer use is recommended for evaluating extreme activity levels (high or low).
    • Incorporating frequency and intensity adjustments, similar to the investigator VAS, enhances activity rating accuracy.