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Validity of compressive leg checking in measuring artificial leg-length inequality
Robert Cooperstein1, Elaine Morschhauser, Anthony Lisi
1Department of Technique, Palmer College of Chiropractic West, San Jose, CA, USA. cooperstein_r@palmer.edu
Journal of Manipulative and Physiological Therapeutics
|December 16, 2003
Summary
Instrumented prone compressive leg checking is highly accurate for detecting leg length inequality (LLI). This method reliably identifies artificial changes in leg length, with a threshold of 3.74 mm needed to confirm a real change.
Area of Science:
- Chiropractic research
- Biomechanical analysis
- Diagnostic accuracy studies
Background:
- Leg length inequality (LLI) is a common clinical finding.
- Accurate assessment of LLI is crucial for effective treatment.
- Existing methods for measuring LLI may have limitations.
Purpose of the Study:
- To evaluate the accuracy of instrumented prone compressive leg checking.
- To determine the reliability and validity of this diagnostic method.
Main Methods:
- A modified pair of surgical boots allowed continuous measurement of LLI.
- Artificial LLI was created using shims (0-6 x 1.6 mm).
- Accuracy was assessed by comparing observed LLI to artificial LLI using ICC, CCC, Bland-Altman analysis, and regression.
Main Results:
- Test-retest reliability was excellent (ICC = .85, CCC = 0.95).
- The method accurately detected artificial changes in leg length +/-1.87 mm.
- Observed and artificial LLI shared 87-88% of their variation.
Conclusions:
- Instrumented prone compressive leg checking demonstrates high accuracy and concurrent validity.
- A difference exceeding 3.74 mm is recommended to confirm a true change in leg length.
- Clinical relevance of this method requires further investigation.