Cast-rod construct for gradual correction of fixed knee flexion deformities in young children with arthrogryposis: Technical note and preliminary results.

INTRODUCTION

Fixed knee flexion deformities (FKFDs) are common in children with arthrogryposis, yet their management in younger children is underreported.

MATERIAL AND METHOD: This study describes a non-invasive cast-rod construct for the gradual correction of FKFDs secondary to arthrogryposis.

RESULTS

This study presents preliminary results from 18 knees in 12 patients under four years old (median age at 30 mo, 18-48). The median knee flexion contracture angle improved from 54.5 degrees (27-90) to 10 degrees (0-30) after cast removal, (p < 0.05). Treatment lasted for a median of 32 days (21-68). At a median eight months follow up (3-47), the angle increased to a median of 28 degrees (10-35), which remained significantly lower than the initial angle, (p < 0.05).

CONCLUSION

The cast-rod construct appears to be an effective tool for improving FKFDs in young children with arthrogryposis: however, further research with extended follow-up is needed to assess the long-term durability of these outcomes.

LEVEL OF EVIDENCE: IV; Case series.