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Measuring leg-length discrepancy by the "iliac crest palpation and book correction" method: reliability and validity
E Hanada1, R L Kirby, M Mitchell
1Division of Physical Medicine and Rehabilitation, Department of Medicine, Dalhousie University, Halifax, NS, Canada.
The iliac crest palpation and book correction (ICPBC) method for measuring leg-length discrepancy (LLD) is highly reliable and moderately valid. This clinical measurement technique is recommended for detecting and quantifying LLD in patients without pelvic deformities.
Area of Science:
- Orthopedics
- Biomechanical measurement
- Clinical assessment
Background:
- Leg-length discrepancy (LLD) is a common condition affecting musculoskeletal health.
- Accurate measurement of LLD is crucial for appropriate clinical management.
- Existing measurement methods have varying degrees of reliability and validity.
Purpose of the Study:
- To evaluate the reliability and validity of the iliac crest palpation and book correction (ICPBC) method for measuring LLD.
- To compare the ICPBC method with radiologic measurements.
Main Methods:
- Intra- and interrater reliability and validity were assessed in 34 healthy subjects.
- A simulated LLD was induced in subjects (7-53 mm).
- Measurements were taken using the ICPBC method and compared with induced LLD and radiographic data.
Main Results:
- The ICPBC method demonstrated high intrarater (ICC=.98) and interrater (ICC=.91) reliability.
- Moderate construct (ICC=.62) and concurrent (ICC=.76) validity were found.
- The method showed a trend towards underestimating LLD compared to induced and radiologic measures.
Conclusions:
- The ICPBC technique is a highly reliable clinical method for measuring LLD.
- It offers moderate validity, making it a useful tool for detecting and quantifying LLD.
- Recommended for use in patients with palpable iliac crests and no history of pelvic deformity.
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