Risser's 1958 landmark paper identifies the iliac apophysis ossification pattern as a reliable radiographic marker for vertebral growth completion. The study asks whether this sign can guide treatment timing in scoliosis — specifically, when curves will stop progressing. Data are drawn from 200 untreated cases followed at Los Angeles Orthopaedic Hospital beginning in 1936.
Every scoliosis treatment algorithm runs on one core question: how much growth remains? Before Risser, vertebral growth plates were not reliably visible on plain films, making this question nearly impossible to answer objectively at the bedside.
When you see a scoliosis patient with no visible iliac apophysis, that patient needs active treatment — brace, cast, or surgical planning. Because 75% of curves will increase 10°–35° before capping even begins.
When the apophysis attaches posteromedially, you can tell that patient and family: the curve is done progressing. No further preventive treatment is required. Braces can be safely discontinued. A pseudarthrosis after fusion no longer threatens progressive deformity beyond the original curve.
The formal Risser 0–V grading scale (with percentage excursion thresholds) was codified in later literature, not in this paper. Risser's original description is qualitative. The numeric scale became a primary variable in the Lonstein and Carlson (1984) curve-progression risk formula and remains embedded in SRS and POSNA bracing guidelines today.
Risser's 1958 landmark paper identifies the iliac apophysis ossification pattern as a reliable radiographic marker for vertebral growth completion. The study asks whether this sign can guide treatment timing in scoliosis — specifically, when curves will stop progressing. Data are drawn from 200 untreated cases followed at Los Angeles Orthopaedic Hospital beginning in 1936.
Every scoliosis treatment algorithm runs on one core question: how much growth remains? Before Risser, vertebral growth plates were not reliably visible on plain films, making this question nearly impossible to answer objectively at the bedside.
When you see a scoliosis patient with no visible iliac apophysis, that patient needs active treatment — brace, cast, or surgical planning. Because 75% of curves will increase 10°–35° before capping even begins.
When the apophysis attaches posteromedially, you can tell that patient and family: the curve is done progressing. No further preventive treatment is required. Braces can be safely discontinued. A pseudarthrosis after fusion no longer threatens progressive deformity beyond the original curve.
The formal Risser 0–V grading scale (with percentage excursion thresholds) was codified in later literature, not in this paper. Risser's original description is qualitative. The numeric scale became a primary variable in the Lonstein and Carlson (1984) curve-progression risk formula and remains embedded in SRS and POSNA bracing guidelines today.