This multicenter retrospective study of 55 hips tested whether classifying SCFE by physeal stability predicts outcomes better than the traditional time-based system. All hips would have been called 'acute' by prior criteria (symptoms under 3 weeks). The key question: within that group, does weight-bearing ability at presentation drive prognosis?
Ask every SCFE patient one question before anything else: can you walk, even with crutches? The answer stratifies AVN risk more powerfully than any radiographic measurement or time threshold.
Before Loder 1993, SCFE was classified as acute, chronic, or acute-on-chronic based on symptom duration — a system that created ambiguity for acute-on-chronic slips and gave no reliable way to counsel families about femoral head survival.
When you see an unstable slip, counsel the family that AVN risk approaches 50% regardless of how quickly you operate. This paper found no protective effect from surgery within 24 hours, and the authors explicitly caution against assuming early reduction is beneficial.
The near-zero AVN risk in stable slips is why aggressive corrective osteotomy remains unpopular even for severe stable slips. The risk-benefit calculus changes completely when baseline AVN risk is 0%.
The high AVN risk in unstable slips has driven divergent surgical philosophies: some favor pinning-in-situ to avoid additional vascular disruption, while others pursue open reduction accepting that the femoral head may already be compromised at the time of presentation.
This multicenter retrospective study of 55 hips tested whether classifying SCFE by physeal stability predicts outcomes better than the traditional time-based system. All hips would have been called 'acute' by prior criteria (symptoms under 3 weeks). The key question: within that group, does weight-bearing ability at presentation drive prognosis?
Ask every SCFE patient one question before anything else: can you walk, even with crutches? The answer stratifies AVN risk more powerfully than any radiographic measurement or time threshold.
Before Loder 1993, SCFE was classified as acute, chronic, or acute-on-chronic based on symptom duration — a system that created ambiguity for acute-on-chronic slips and gave no reliable way to counsel families about femoral head survival.
When you see an unstable slip, counsel the family that AVN risk approaches 50% regardless of how quickly you operate. This paper found no protective effect from surgery within 24 hours, and the authors explicitly caution against assuming early reduction is beneficial.
The near-zero AVN risk in stable slips is why aggressive corrective osteotomy remains unpopular even for severe stable slips. The risk-benefit calculus changes completely when baseline AVN risk is 0%.
The high AVN risk in unstable slips has driven divergent surgical philosophies: some favor pinning-in-situ to avoid additional vascular disruption, while others pursue open reduction accepting that the femoral head may already be compromised at the time of presentation.