Limb-length discrepancy measured with computerized axial tomographic equipment.

Huurman, Walter W.; Jacobsen, F. S.; Anderson, James C.; Chu, Wei-Kom

doi:10.2106/00004623-198769050-00010

Cited by 42 publications

(24 citation statements)

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“…Several authors have reported the results of LLD measurement using a variety of imaging techniques such as orthoroentgenogram [13], CR-based teleoroentgenogram [38], slit scanogram [28], microdose digital radiography [3], CT scanogram [1,2,19], ultrasound [42], and MRI scanogram [25]. One needs to consider several issues such as reliability, accuracy, magnification, radiation dose, cost, need for special equipment, convenience, and opportunity to image the entire extremity when choosing the imaging technique for evaluating patients presenting with LLD (Table 1).…”

Section: Discussionmentioning

confidence: 99%

“…The authors cautioned clinicians against relying on the teleoroentgenogram for assessing lower-limb length and alignment in patients with an overlying circular external fixator. Other techniques such as a lateral scanogram or a biplanar CT scan [1,12,19] may improve the accuracy of LLD measurement in such patients.…”

Section: Teleoroentgenogrammentioning

confidence: 99%

“…Digitalized images obtained with a CT scan have also been used for measuring LLD [1,2,12,17,19,44]. Typically, an anteroposterior (AP) scout view of the bilateral femurs (Fig.…”

Section: Ct Scanogrammentioning

confidence: 99%

“…6) and tibias are obtained, although use of lateral view CT scanograms has also been reported [1,12]. Cursors are placed over the superior aspect of the imaged femoral head and the distal portion of the medial femoral condyle [2,17,19] with the distance between these two cursors representing the length of the individual femur. The tibial length is similarly determined by measuring the distance between cursors placed at the medial tibial plateau and the tibial plafond.…”

Section: Ct Scanogrammentioning

confidence: 99%

“…Huurman et al [19] studied in-vitro precision and accuracy of CT scanogram and orthoroentgenogram using adult femoral and tibial specimens that were placed flat on a table top. The accuracy and interobserver variability for both techniques was very similar, with less than 3 mm difference in measurement, compared to the actual length of the specimens that was measured using calipers.…”

Section: Ct Scanogrammentioning

confidence: 99%

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Methods for Assessing Leg Length Discrepancy

Sabharwal

Kumar

2008

Clinical Orthopaedics &Amp; Related Research

302

211

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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.

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Section: Discussionmentioning

confidence: 99%

Section: Teleoroentgenogrammentioning

confidence: 99%

“…Digitalized images obtained with a CT scan have also been used for measuring LLD [1,2,12,17,19,44]. Typically, an anteroposterior (AP) scout view of the bilateral femurs (Fig.…”

Section: Ct Scanogrammentioning

confidence: 99%