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Clinical implications of clubfoot histopathology
G J Loren1, N C Karpinski, S J Mubarak
1Children's Hospital and Health Center, San Diego, California, USA.
Insights
Muscle fiber abnormalities in children with idiopathic clubfoot (equinovarus) may predict recurrence. Abnormalities in the peroneus brevis muscle were linked to a higher risk of reoperation and other deformities.
Area of Science:
- Orthopedics
- Pediatric Surgery
- Muscle Histopathology
Background:
- Idiopathic rigid equinovarus is a common congenital foot deformity in children.
- The underlying causes and factors predicting recurrence remain incompletely understood.
- Peroneus brevis muscle abnormalities have been anecdotally associated with clubfoot.
Purpose of the Study:
- To investigate the prevalence and significance of ipsilateral peroneus brevis muscle histopathology in children with idiopathic rigid equinovarus.
- To determine if muscle fiber abnormalities correlate with the risk of recurrent deformity and other orthopedic issues.
- To assess the predictive value of muscle histology for long-term outcomes after surgical correction.
Main Methods:
- Histopathological examination of peroneus brevis muscle biopsies from 64 children undergoing posteromedial-lateral release for idiopathic rigid equinovarus.
- Classification of muscle fiber morphology, including congenital fiber-type disproportion and fiber-size variation.
- Correlation of histological findings with clinical outcomes, including recurrence rates, reoperations, and associated deformities over a minimum 2-year follow-up.
Main Results:
- Fifty percent of muscle biopsies revealed abnormal fiber morphology (congenital fiber-type disproportion or fiber-size variation).
- Feet with abnormal muscle histology showed a significantly higher incidence of recurrent equinovarus deformity (relative risk 5.6) requiring reoperation.
- Abnormal muscle histology was also associated with increased rates of developmental internal tibial torsion and a higher recurrence risk in male patients with bilateral deformities.
Conclusions:
- Muscle fiber abnormalities are prevalent in idiopathic equinovarus.
- These histological anomalies in the peroneus brevis muscle appear to be a significant predictor of recurrent clubfoot deformity and other limb alignment issues.
- Histopathological assessment may aid in identifying patients at higher risk for poorer surgical outcomes.
Abstract:
Ipsilateral peroneus brevis muscle histopathology was studied in 64 children with idiopathic rigid equinovarus at the setting of initial posteromedial-lateral release. Fifty percent of biopsies demonstrated abnormal muscle fiber morphology, classified as congenital fiber-type disproportion or fiber-size variation. Forty-one infants (59 feet) underwent initial surgical intervention within the first year of life with a minimum 2-year follow-up. Feet with abnormal muscle histology had a significantly greater incidence of recurrent equinovarus deformity requiring reoperation; the relative risk of clubfoot recurrence in children with fiber abnormalities was 5.6. Male patients with bilateral deformity and abnormal peroneus brevis histology had a particularly high incidence of recurrent equinovarus. Developmental internal tibial torsion requiring surgical intervention was also greater in the abnormal-fiber histology group. The incidence of postoperative metatarsus adductus/varus necessitating surgery was comparable despite histologic findings. Thus muscle-fiber abnormalities are prevalent in idiopathic equinovarus. Such fiber-type anomalies may predict recurrent limb deformities.