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Between-day repeatability of knee kinematics during functional tasks recorded using flexible electrogoniometry.

M L van der Linden¹, P J Rowe, R W Nutton

¹School of Health Sciences, Queen Margaret University, Queen Margaret University Drive, Musselburgh EH21 6UU, Scotland, UK. mvanderlinden@qmu.ac.uk

|March 11, 2008

Summary

Electrogoniometry for knee motion showed poor repeatability for individual patient assessments. However, it is repeatable for measuring average changes in knee movement before and after total knee replacement surgery in groups.

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Area of Science:

Biomechanics
Orthopedic Surgery
Rehabilitation

Background:

Assessing knee joint function is crucial for evaluating outcomes after total knee replacement (TKR).
Electrogoniometry offers a non-invasive method to measure knee kinematics during daily activities.
Understanding the repeatability of these measurements is essential for reliable clinical interpretation.

Purpose of the Study:

To evaluate the between-day repeatability of knee kinematics measured by electrogoniometry during various activities of daily living.
To determine if electrogoniometry is a reliable tool for assessing individual knee motion or group changes post-TKR.

Main Methods:

Fifteen subjects (post-TKR patients, pre-TKR patients, and controls) underwent two electrogoniometry assessments of knee motion.

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Thirteen daily activities were recorded, with assessments separated by an average of 22 days.

Intra-class correlation coefficients and Bland and Altman coefficients of repeatability were calculated.

Main Results:

Repeatability varied significantly across different activities and measurement metrics.
Intra-class correlation coefficients exceeded 0.75 for most peak knee angle measures, except for sitting and rising.
Coefficients of repeatability ranged widely, from 5.6° (level walking) to 39.8° (stepping out of a bath), with some exceeding clinically significant changes.

Conclusions:

Single assessments of functional knee motion using electrogoniometry lack sufficient repeatability for individual patient evaluation.
Electrogoniometry can reliably assess average knee motion changes in groups of patients before and after TKR, particularly during activities like level walking and stair negotiation.