case_images: PMC6727441_01
case_images: Lateral radiograph showing ossified fragment before arthroscopy.
case_images: JOCR-9-15-g001.jpg
case_images: PMC6727441_01_JOCR-9-15-g001.jpg
case_images: F1
case_images: Radiographs demonstrated an intra-articularbony fragment (Fig. 1).
case_images: a: Arthroscopic image heterotopic bone. b: Arthroscopic image heterotopic bone impinging in extension.
case_images: JOCR-9-15-g002.jpg
case_images: PMC6727441_01_JOCR-9-15-g002.jpg
case_images: F2
case_images: Arthroscopy was performed which showed a bony fragment impinging in the anterior aspect of the knee joint blocking full extension (Fig. 2a and b).
case_images: Radiograph following removal of fragment and progression to union.
case_images: JOCR-9-15-g003.jpg
case_images: PMC6727441_01_JOCR-9-15-g003.jpg
case_images: F3
case_images: The fragment was removed arthroscopically and his symptoms completely resolved (Fig. 3).