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Related Experiment Videos

When does postoperative standing function after total knee arthroplasty improve beyond preoperative level of

Kengo Harato1, Toshiro Otani, Nobuyasu Nakayama

  • 1Department of Orthopaedic Surgery, Tokyo Metropolitan Health and Medical Treatment Corporation, Ohkubo Hospital, Tokyo, Japan. kharatoh@yahoo.co.jp

The Knee
|November 28, 2008
PubMed
Summary

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Post-total knee arthroplasty (TKA) patients experience initial pain and reduced standing function. However, pain significantly improves by day 8, with standing function surpassing pre-surgery levels by day 17.

Area of Science:

  • Orthopedics
  • Rehabilitation Medicine
  • Biomedical Engineering

Background:

  • Total knee arthroplasty (TKA) is a common procedure for end-stage knee osteoarthritis.
  • Understanding the timeline of functional recovery post-TKA is crucial for patient management and rehabilitation protocols.

Purpose of the Study:

  • To investigate the inpatient recovery trajectory of standing function after TKA.
  • To determine when objective and subjective measures of standing function surpass preoperative levels.

Main Methods:

  • Thirty patients (average age 75) with bilateral knee osteoarthritis underwent unilateral TKA.
  • Evaluated subjective pain (Visual Analog Scale) and objective measures (vertical knee force, knee flexion angle) during relaxed standing pre- and post-operatively.
  • Data collected across multiple postoperative days to track recovery trends.

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Main Results:

  • Postoperative pain peaked on day 3, significantly decreasing by day 8 compared to preoperative levels.
  • Vertical knee force reached a minimum on day 3, significantly exceeding preoperative levels by day 17.
  • Knee flexion angle peaked on day 4, with improved knee extension observed by day 16.

Conclusions:

  • Subjective pain relief is evident from postoperative day 8.
  • Objective measures of standing function, including knee force and flexion, show significant improvement by postoperative days 16-17.
  • This study provides a timeline for recovery of standing function post-TKA, aiding in setting patient expectations and guiding rehabilitation.