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Clin Orthop Relat Res. 2008 Dec;466(12):2910-22. doi: 10.1007/s11999-008-0524-9. Epub 2008 Oct 4.

Methods for assessing leg length discrepancy.

Author information

  • 1Division of Pediatric Orthopaedics, Department of Orthopaedics, UMDNJ-New Jersey Medical School, Newark, NJ, USA. sabharsa@umdnj.edu

Abstract

The use of accurate and reliable clinical and imaging modalities for quantifying leg-length discrepancy (LLD) is vital for planning appropriate treatment. While there are several methods for assessing LLD, we questioned how these compared. We therefore evaluated the reliability and accuracy of the different methods and explored the advantages and limitations of each method. Based on a systematic literature search, we identified 42 articles dealing with various assessment tools for measuring LLD. Clinical methods such as use of a tape measure and standing blocks were noted as useful screening tools, but not as accurate as imaging modalities. While several studies noted that the scanogram provided reliable measurements with minimal magnification, a full-length standing AP computed radiograph (teleoroentgenogram) is a more comprehensive assessment technique, with similar costs at less radiation exposure. We recommend use of a CT scanogram, especially the lateral scout view in patients with flexion deformities at the knee. Newer modalities such as MRI are promising but need further investigation before being routinely employed for assessment of LLD.

LEVEL OF EVIDENCE:

Level IV, diagnostic study. See the Guidelines for Authors for a complete description of levels of evidence.

PMID:
18836788
[PubMed - indexed for MEDLINE]
PMCID:
PMC2628227
Free PMC Article
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