Baumann angle, also known as the humeral-capitellar angle, is used for the evaluation of the displacement of pediatric supracondylar humeral fractures. It is measured on a frontal radiograph, with elbow in extension.
This angle is formed by the humeral axis and a straight line through the epiphyseal plate of the capitulum.
A value between 64 - 81º is considered normal1. But due to significant variation between individuals, Baumann’s angle is better evaluated by comparison to the contralateral side. And a difference of more than 5° between the two sides is considered abnormal.
An increased Bauman's angle will occur with residual varus and internal rotation deformities.
- 1. Williamson DM, Coates CJ, Miller RK, Cole WG. Normal characteristics of the Baumann (humerocapitellar) angle: an aid in assessment of supracondylar fractures. J Pediatr Orthop 1992;12(5):636-639.
- 2. Acton JD, McNally MA. Baumann's confusing legacy. Injury 2001;32(1):41-43.
- 3. Silva M, Pandarinath R, Farng E et-al. Inter- and intra-observer reliability of the Baumann angle of the humerus in children with supracondylar humeral fractures. Int Orthop. 2010;34 (4): 553-7. doi:10.1007/s00264-009-0787-0 - Free text at pubmed - Pubmed citation