Shepherd’s crook
Wikipedia.org. Published March 23, 2006. Accessed October 30, 2024. https://en.wikipedia.org/wiki/Shepherd's_crook#/media/File:Shepherd's_hook_-_01.jpg
Shepherd crook deformity of the bilateral femur characterized by outward bowing of the shaft. The greater trochanter of the left head of femur is also impacting against the underside of the pelvis with resultant deformity. The rest of the skeleton is also hyperlucent with thinning of the cortices. However, note the cortical thickening of the bilateral femoral shaft in contrast to the rest of the skeleton, compensating for the additional biomechanical forces due to the pathological curvature.
Case courtesy Dr Marrie Pegu, Dr Supriya Paul & Dr Nabarun Das, MD // #SMCHCase
(a) Lateral X-ray of the left leg showing expansive radiolucent lesions and cortical bone thinning of the fibula. (b) Anteroposterior X-ray of pelvis with a shepherd’s crook deformity of the proximal left femur. (c) Technetium-99 scintigraphy scan revealing increased tracer uptake in areas of fibrous dysplasia including skull, humerus, right ulna, both femurs, iliac bones and left fibula.
Rato MS, Bernardo A, Pinheiro FO, Bernardes M, Costa L. Shepherd’s crook deformity: Do you recognize this sign? Archives of Rheumatology. 2022;38(2):329-331. doi:https://doi.org/10.46497/archrheumatol.2023.9869
Further reading:
https://doi.org/10.1007/978-3-319-78033-7_27
https://doi.org/10.1007/s11751-013-0174-7
