Hip dislocation in cerebral palsy: evolution of the contralateral side after reconstructive surgery

Area of Science:

• Orthopedic surgery
• Pediatric orthopedics
• Cerebral palsy research

Background:

• Hip dislocation is a common complication in severe spastic cerebral palsy (Gross Motor Functional Classification System [GMFCS] IV-V).
• Unilateral reconstruction aims to address hip dislocation, but contralateral hip progression remains a concern.

Purpose of the Study:

• To evaluate contralateral hip progression after unilateral hip reconstruction in GMFCS IV-V patients.
• To identify prognostic factors for contralateral hip evolution in this population.

Main Methods:

• Retrospective study of 17 spastic cerebral palsy patients (GMFCS IV-V) undergoing unilateral hip reconstruction.
• Evaluated clinical (age, abduction), treatment (femoral shortening, botulinum toxin), and radiographic (Reimer extrusion index [REI], acetabular angle [AA], Shenton's line) parameters.
• Minimum 30-month postoperative follow-up.

Main Results:

• Eight patients (Group I) presented with dislocation, nine (Group II) did not.
• Older age at surgery showed a trend towards no contralateral dislocation.
• Hips with REI < 30% and AA < 25° had only one instance of dislocation during follow-up.
• Contralateral subluxation occurred within the first two years post-surgery.

Conclusions:

• Hips with REI < 30% and AA < 25° are unlikely to progress to subluxation and may be observed.
• Preoperative clinical and radiographic measurements alone do not reliably predict the natural evolution of non-operated hips.
• The initial two years post-surgery represent a critical period for contralateral subluxation.