Between a Rock and a Hard Place
Author: R. Conner Dixon, MD
Peer-Reviewer and Final Editor: Alex Tomesch, MD, CAQ-SM
A 17-year-old male basketball player presents with right lateral thigh pain for the past 3 weeks. He had a collision with another player 5 weeks prior that resulted in a bruise that has since resolved. He is mildly tender over the lateral mid-thigh in the soft tissues and has a decreased knee flexion. 
Image 1-2: Author’s own images
References:
[1] Devilbiss, Zachary DO1; Hess, Matthew MD1; Ho, Garry W.K. MD, FACSM, FAAFP, RMSK, CIC2 Myositis Ossificans in Sport: A Review, Current Sports Medicine Reports: September 2018 - Volume 17 - Issue 9 - p 290-295 doi: 10.1249/JSR.0000000000000515
[2] Simon T, Guillodo Y, Madouas G, Saraux A. Myositis ossificans traumatica (circumscripta) and return to sport: a retrospective series of 19 cases. Joint Bone Spine. 2016; 83:416Y20.
[3] Ngai A. Post-traumatic myositis ossificans. In: Roger B, Guermazi A, Skaf A, editors. Muscle Injuries in Sport Athletes. Sports and Traumatology. Springer. New York (NY): 2017.