Kyphosis (much less commonly kyphus) is a term used to describe the sagittal curvature of the thoracic spine.
An increased kyphotic angle is seen in the following conditions:
- Scheuermann disease
- vertebral body fracture
A decreased kyphotic angle is seen in the following condition:
- traditionally measured using the Cobb angle
- may over-estimate kyphosis if there is concomitant vertebral end-plate irregularities 1
- the alternative Cobb 1 or vertebral centroid angles 3 have been proposed to negate the aforementioned over-estimation
History and etymology
Derived from the Greek word kyphōsis, from kyphos meaning humpbacked 4.
- 1. Goh S, Price RI, Leedman PJ et-al. A comparison of three methods for measuring thoracic kyphosis: implications for clinical studies. Rheumatology (Oxford). 2000;39 (3): 310-5. doi:10.1093/rheumatology/39.3.310 - Pubmed citation
- 2. Greig AM, Briggs AM, Bennell KL et-al. Trunk muscle activity is modified in osteoporotic vertebral fracture and thoracic kyphosis with potential consequences for vertebral health. PLoS ONE. 2014;9 (10): e109515. doi:10.1371/journal.pone.0109515 - Free text at pubmed - Pubmed citation
- 3. Briggs AM, Wrigley TV, Tully EA et-al. Radiographic measures of thoracic kyphosis in osteoporosis: Cobb and vertebral centroid angles. Skeletal Radiol. 2007;36 (8): 761-7. doi:10.1007/s00256-007-0284-8 - Pubmed citation
- 4. www.merriam-webster.com. kyphosis. Read relevant article. Accessed on 07/04/2016