Perthes Decision Support
Source-locked clinical decision support for Legg-Calvé-Perthes Disease
Stage 1 — Treatment Pathway
Age at Symptom Onset
Current Age
Modified Waldenström Stage
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Stage I — Initial / Avascular
Stage IIa — Early Fragmentation
Stage IIb — Late Fragmentation
Stage IIIa — Early Re-ossification
Stage IIIb — Late Re-ossification
Stage IV — Remodeling / Healed
Herring Lateral Pillar Classification
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Not yet classifiable — before peak fragmentation
Group A
Group B
Group B/C Border
Group C
Herring classification should be assessed at peak fragmentation. Select “Not yet classifiable” when the patient has not yet reached that phase.
Hip Range of Motion
Hip Abduction (degrees)
Hip Flexion
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Full / near-full
Limited
Uncertain
Hip Internal Rotation
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Preserved
Limited
Uncertain
Hip External Rotation
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Preserved
Limited
Uncertain
Fixed Adduction Contracture
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Yes
No
Uncertain
Fixed Flexion Contracture
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Yes
No
Uncertain
Containment
Containment / Extrusion Status
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Concentric containment
Lateral subluxation / extrusion
Epiphyseal Extrusion (%)
Containability in Abduction
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Yes
No
Uncertain
Hinge Abduction
Select...
Yes
No
Uncertain
Management
Previous Treatment
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