This protocol applies to children who present with Perthes disease in the early stages of radiographic evolution — Stage Ia, Ib, or IIa — whose disease onset occurred before age 7, and in whom no femoral head extrusion is present at assessment.
Children in this specific sub-group have prognostic characteristics that influence the management pathway. The absence of extrusion at this early stage, combined with young age at onset, shapes the approach to intervention and monitoring.
In children under 7 years at disease onset, extrusion may or may not develop during the course of the disease. Close radiographic follow-up — with anteroposterior and frog-lateral views at regular intervals — is central to catching any change in femoral head containment promptly.
In this early-stage, young-age, no-extrusion scenario, certain children may have a favourable prognosis that informs the decision regarding whether active containment is indicated. Some children in this group do not require active intervention; however, follow-up through to skeletal maturity remains important for outcome evaluation.
The full structured protocol details the specific decision criteria, monitoring schedule, and thresholds for escalation.
DOI: 10.4103/0019-5413.143906
In children under 7 years at the onset of the disease extrusion may or may not occur; these children need to be monitored closely with anteroposterior and frog-lateral radiographs, every 3 or 4 months and containment ensured as soon as extrusion is identified without any delay.
Children may not qualify for containment based on the decision-making outline shown in Table 1; these include children who do not need containment as the prognosis is good (e.g., a 6-year-old child in Stage IIa with no extrusion) and children who are denied containment since it is too late for containment to be of benefit (children in Stage IIb or later).
Both these groups of children need no active intervention but should be followed up till skeletal maturity to evaluate their outcome.
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