Sanders et al. introduce an 8-stage hand radiograph–based skeletal maturity classification for adolescent idiopathic scoliosis, simplified from Tanner-Whitehouse-III descriptors. The study tests whether this rapid, atlas-free system can predict curve acceleration phase timing and estimate the probability of progression beyond the surgical threshold of 50°. The cohort included 22 girls followed prospectively through their growth spurt with serial spine and skeletal age radiographs.
The Risser sign, long the standard for assessing skeletal maturity in AIS, is blind to five distinct stages of growth (Sanders 1–5) that all appear as Risser 0. This matters enormously: two Risser-0 girls with identical 25° curves can have 100% vs. 0% probability of needing surgery.
Get a hand AP and stage it when you see a Risser-0 girl with AIS. A 25° curve at stage 2 is almost certain to reach 50° despite bracing. The same curve at stage 4 almost certainly will not.
Stage 3 is your action window. Capped epiphyses with metacarpal heads wider than metaphyses means you are at peak height velocity, curve acceleration is starting, and the patient is about to enter the fastest phase of progression.
The classification takes seconds once learned, requires only a standard hand radiograph, and does not need a proprietary atlas. It is the reason modern AIS management uses hand films rather than relying on the pelvis alone.
Sanders et al. introduce an 8-stage hand radiograph–based skeletal maturity classification for adolescent idiopathic scoliosis, simplified from Tanner-Whitehouse-III descriptors. The study tests whether this rapid, atlas-free system can predict curve acceleration phase timing and estimate the probability of progression beyond the surgical threshold of 50°. The cohort included 22 girls followed prospectively through their growth spurt with serial spine and skeletal age radiographs.
The Risser sign, long the standard for assessing skeletal maturity in AIS, is blind to five distinct stages of growth (Sanders 1–5) that all appear as Risser 0. This matters enormously: two Risser-0 girls with identical 25° curves can have 100% vs. 0% probability of needing surgery.
Get a hand AP and stage it when you see a Risser-0 girl with AIS. A 25° curve at stage 2 is almost certain to reach 50° despite bracing. The same curve at stage 4 almost certainly will not.
Stage 3 is your action window. Capped epiphyses with metacarpal heads wider than metaphyses means you are at peak height velocity, curve acceleration is starting, and the patient is about to enter the fastest phase of progression.
The classification takes seconds once learned, requires only a standard hand radiograph, and does not need a proprietary atlas. It is the reason modern AIS management uses hand films rather than relying on the pelvis alone.