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Multiplanar deformity analysis of untreated Blount disease
Sanjeev Sabharwal1, James Lee, Caixia Zhao
1Department of Orthopedics, New Jersey Medical School, University of Medicine and Dentistry of New Jersey, Newark, New Jersey 07103, USA. sabharsa@umdnj.edu
Journal of Pediatric Orthopedics
|April 7, 2007
Summary
Blount disease involves tibial varus, but early-onset cases show greater severity. Late-onset Blount disease also involves distal femur varus, highlighting the need for multiplanar analysis in children.
Area of Science:
- Orthopedics
- Pediatric Orthopedics
- Skeletal Dysplasias
Background:
- Blount disease primarily involves proximal tibial varus malalignment.
- Associated multiplanar deformities can influence treatment strategies.
Purpose of the Study:
- To assess multiplanar lower limb deformities in early- and late-onset Blount disease.
- To compare deformities between early- and late-onset Blount disease and with uninvolved limbs.
Main Methods:
- Retrospective analysis of 60 limbs from 40 patients with untreated Blount disease requiring surgery.
- Preoperative frontal and sagittal plane deformity analysis using Paley's methodology.
- Rotational profile assessment using prone clinical examination.
Main Results:
- Both early- and late-onset Blount disease groups showed proximal tibial varus, procurvatum, and internal torsion, with greater severity in early-onset.
- Late-onset Blount disease exhibited approximately one-third of varus malalignment attributed to the distal femur.
- Severity of limb varus malalignment correlated with proximal tibial deformities and, in late-onset, with distal femoral varus.
Conclusions:
- Multiplanar deformity analysis is crucial for comprehensive evaluation of children with Blount disease.
- Distal femoral varus is a significant factor in late-onset Blount disease, differentiating it from early-onset.
- Understanding multiplanar deformities aids in surgical planning and treatment for Blount disease.
