Treatment of Perthes Disease with Reduced Hip Abduction and Hinge Abduction — Late Fragmentation (Stage IIb) or Reconstitution Stage
This protocol addresses the specific clinical situation in which a child with Perthes disease has reached the late stage of fragmentation (Stage IIb) or the stage of reconstitution and presents with a reduced range of hip abduction and hinge abduction — a pattern in which attempted abduction causes the femoral head to hinge rather than to glide normally under the acetabulum.
Clinical Scenario
At this stage of the disease, early deformation of the femoral head has already occurred. Some children demonstrate a reduced range of motion — particularly abduction — and attempted abduction produces hinging. This combination of findings defines a specific sub-population requiring a targeted surgical approach distinct from earlier-stage management.
Treatment Approach (Partial Overview)
The structured protocol involves a surgical femoral osteotomy technique designed to overcome hinge abduction and restore a more congruent relationship between the femoral head and the acetabulum. Timing of the intervention — relative to the stage of femoral head reconstitution — is a central consideration in the protocol.
The full surgical indication criteria, operative details, and staging algorithm are available in the complete protocol below.
Clinical Goals
Hip pain relief
Resolution of hinge abduction
References
DOI: 10.4103/0019-5413.143906
Treatment in the late part of the stage of fragmentation or in the early part of the stage of reconstitution attempts to minimize the effects of early deformation of the femoral head that has already occurred.
At this stage, some children have a reduced range of motion (particularly abduction) and attempted abduction results in hinging.
A valgus femoral osteotomy overcomes the hinging and brings a more congruent surface of the femoral head under the acetabulum.
The operation should be performed in the advanced stage of reconstitution rather than in the late part of the fragmentation stage because sufficient reconstitution of the femoral head should have occurred enough to withstand weight-bearing stresses without getting deformed.
The valgus osteotomy when performed for hinge abduction relieves pain and improves functional scores.
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