• ABSTRACT
    • Age and migration percentage were evaluated as risk factors for the progression of spastic hip subluxation in patients with cerebral palsy. Three age-groups were defined: group 1 (two to eight years), group 2 (nine to 18 years), and group 3 (over 18 years). Four subluxation groups were defined by migration percentage: group A (< 30 per cent), group B (30 to 60 per cent), group C (60 to 90 per cent), and group D (> 90 per cent). The risk of progression was the same in groups 1A and 2A, and both of these were higher than the risk in group 3A. All group B hips had similar risks for progression, and all group C hips progressed to group D (> 90 per cent migration percentage). Groups 1A, 1B, 2A, 2B and 3B hips need close radiographic follow-up to detect progressive subluxation. All group C hips required surgical treatment for progression to dislocation to be avoided.