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Computed Tomography Scanographic Analysis of Symptomatic Limb Length Discrepancy.
Alex Fleischman1,2, Michael An1,3, Wendy Young1,2
1*Section of Podiatry, Orthopedic Service, Veterans Affairs Medical Center, Northport, NY.
Journal of the American Podiatric Medical Association
|March 24, 2025
Summary
This study found that the left limb is significantly longer than the right limb due to increased femoral length, a key finding in limb length discrepancy (LLD) research using CT scanography.
Area of Science:
- Orthopedics
- Radiology
- Biomedical Engineering
Background:
- Limb length discrepancy (LLD) occurs when one limb is longer than the other.
- Symptomatic LLD arises from compensatory mechanisms.
- Computed tomography (CT) scanography offers advanced LLD analysis.
Purpose of the Study:
- To analyze lower-extremity limb lengths using CT scanograms.
- To determine side dominance and associated measurements in LLD.
- To investigate femoral and tibial length differences.
Main Methods:
- Retrospective study of 400 patients (2007-2017).
- CT scanograms used for limb length measurements.
- Paired sample t-tests compared osseous components and total limb length.
Main Results:
- The left limb was significantly longer than the right limb (approx. 0.10 cm).
- The left femur was significantly longer than the right femur (approx. 0.07 cm).
- No significant difference was found in tibial length between limbs.
Conclusions:
- A significant limb length differential exists, with the left limb being longer.
- This difference is primarily due to increased femoral length.
- Larger studies are needed to confirm findings due to low statistical power.
