Deformity correction in children with hereditary hypophosphatemic rickets

Area of Science:

• Orthopedics
• Pediatric Endocrinology
• Genetics

Background:

• X-linked hereditary hypophosphatemic rickets (XLH) causes significant multiplanar lower limb deformities in children.
• These deformities can lead to functional limitations and require surgical intervention for correction.
• Long-term outcomes and recurrence rates of corrective surgeries in XLH are critical for patient management.

Purpose of the Study:

• To evaluate the efficacy of surgical correction for lower limb deformities in children with X-linked hypophosphatemic rickets.
• To assess complication rates associated with various surgical techniques used for deformity correction.
• To determine the recurrence rates of deformities following initial and subsequent corrective surgeries.

Main Methods:

• A cohort of 10 children with XLH, followed from childhood to skeletal maturity.
• 37 corrective operations were performed using external fixation (Kirschner wires, DynaFix, Taylor Spatial Frame, Ilizarov) and internal fixation (intramedullary nailing).
• Radiographic assessment of mechanical axis and joint orientation angles, with follow-up periods ranging from 5 to 12 months.

Main Results:

• Post-consolidation, the mechanical axis was typically corrected, with average angles within acceptable ranges.
• However, deviation of the mechanical axis and knee orientation increased during follow-up.
• A high recurrence rate of 90% was observed after the first corrective procedure, and 60% after a second procedure.

Conclusions:

• Surgical correction of lower limb deformities in X-linked hypophosphatemic rickets presents significant challenges.
• High recurrence rates suggest that current surgical methods may not provide durable correction for these complex deformities.
• Further research into optimizing surgical techniques and long-term management strategies is warranted for XLH patients.