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Those with Cobb angle of more than 60° usually have respiratory complications. [7] Scoliosis cases with Cobb angles between 40 and 50 degrees at skeletal maturity progress at an average of 10 to 15 degrees during a normal lifetime. Cobb angles of more than 50 degrees at skeletal maturity progress at about 1 to 2 degrees per year. [8]
A Chêneau brace achieving correction from 56° to 27° Cobb angle. Progressive scolioses exceeding 25° Cobb angle in the pubertal growth spurt should be treated with a pattern-specific brace like the Chêneau brace and its derivatives, with an average brace-wearing time of 16 hours/day (23 hours/day assures the best possible result).
Scoliosis is defined as a three-dimensional deviation in the axis of a person's spine. [46] [7] Most instances, including the Scoliosis Research Society, define scoliosis as a Cobb angle of more than 10° to the right or left as the examiner faces the person, i.e. in the coronal plane. [86]
Treatment for severe cases of AIS (more than 40° Cobb angle) consists of corrective surgery usually involving bone grafts and the insertion of proper spinal instrumentation into the spine. [45] [10] These treatments typically do not have high post-surgical complication rates. [50] Scoliosis bracing treatment
Cobb Angle - (3 x Risser Sign) Progression Factor = ──────────────────────────────── Chronological Age From: Lonstein JE, Carlson JM (1984). "The prediction of curve progression in untreated idiopathic scoliosis during growth".
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His studies of thousands of patients showed that only 10% of patients with scoliosis require such surgery. To obtain an accurate and consistent assessment of the severity of spinal deformity, so as to avoid unnecessary surgery, Cobb developed a simple and reliable method for measuring the angle of curvature which has become known as the Cobb angle.
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