Coxa valga

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Coxa valga
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Left to right: coxa vara , normal femur, coxa valga
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Coxa valga is a deformity of the hip where the angle formed between the head and neck of the femur and its shaft is increased, usually above 135 degrees.

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The deformity may develop in children with neuromuscular disorders (i.e. cerebral palsy, spinal dysraphism, poliomyelitis), skeletal dysplasias, and juvenile idiopathic arthritis.

Coxa valga deformity is a common pathologic condition in children with cerebral palsy, and they may be predisposed to hip subluxation or dislocations. [1]

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Coxa vara is a deformity of the hip, whereby the angle between the head and the shaft of the femur is reduced to less than 120 degrees. This results in the leg being shortened and the development of a limp. It may be congenital and is commonly caused by injury, such as a fracture. It can also occur when the bone tissue in the neck of the femur is softer than normal, causing it to bend under the weight of the body. This may either be congenital or the result of a bone disorder. The most common cause of coxa vara is either congenital or developmental. Other common causes include metabolic bone diseases, post-Perthes deformity, osteomyelitis, and post traumatic. Shepherd's Crook deformity is a severe form of coxa vara where the proximal femur is severely deformed with a reduction in the neck shaft angle beyond 90 degrees. It is most commonly a sequela of osteogenesis imperfecta, Paget's disease, osteomyelitis, tumour and tumour-like conditions.

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References

  1. Hsieh, H. C.; Wang, T. M.; Kuo, K. N.; Huang, S. C.; Wu, K. W. (2019). "Guided Growth Improves Coxa Valga and Hip Subluxation in Children with Cerebral Palsy". Clinical Orthopaedics and Related Research. 477 (11): 2568–2576. doi:10.1097/CORR.0000000000000903. PMC   6903837 . PMID   31425278.