Sub-capital coxa valga after varus osteotomy for congenital dislocation of the hip

Area of Science:

• Orthopedic Surgery
• Pediatric Orthopedics
• Hip Dysplasia Research

Background:

• Congenital dislocation of the hip (CDH) is a condition requiring surgical intervention.
• Varus osteotomy is a surgical procedure used to correct hip deformities in CDH.
• Coxa valga, an abnormal increase in the neck-shaft angle of the femur, can be a rare complication.

Observation:

• This study details six cases of coxa valga developing after varus osteotomy for CDH.
• Follow-up averaged nine years, with varying surgical approaches (unilateral vs. bilateral).
• Radiographic analysis included neck-shaft angle, acetabular angle, and C.E. angle, noting epiphysis-shaft angle as an indicator of capital epiphysis positioning.

Findings:

• Sub-capital coxa valga was observed in all six cases.
• The exact cause of coxa valga post-osteotomy remains unknown.
• Damage to growth plates was not identified as a primary etiological factor; poor acetabular cover was considered a potential contributor.

Implications:

• Patients in this series exhibited functionally excellent hips despite the radiographic changes.
• The long-term prognosis for hips with partially uncovered femoral heads following this complication is uncertain.
• Further research is needed to elucidate the etiology and optimize management strategies for this complication.