kyphosis

T2 weighted sagittal MRI image demonstrating kyphosis of the lower thoracic spine.

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Kyphosis is an abnormal degree of curvature of the thoracic spine (upper back) in the forward direction (flexion). Kyphosis may be congenital or may occur in post-menopausal osteoporosis with collapse of the anterior (front) part of vertebral bodies in the upper back.
In kyphosis, forward curvature of the spine up to 20 degrees is considered normal, and mild up to 40 degrees. Bracing is prescribed for angles over 40 degrees and balance can be impaired by kyphotic curves greater than 40 degrees. Curves of 50 degrees or greater can produce a significant restrictive breathing deficit and should have vital capacity tested with spirometry. As with scoliosis, extremely abnormal curves of 100 - 110 degrees or more can compromise cardiac function.


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