Weekly Case

Title : Case 648

Age / Sex : 10 / M

Chief complaint :

Left elbow medial aspect bony protrusion

What is your diagnosis?

Two weeks later, you can see the final diagonosis with a brief discussion of this case (Please submit only one answer).

Courtesy : Eun Hae Park, Chonbuk National University Hospital



Osteonecrosis of trochlea (Trochlear AVN)



V shape trochlea, fish tail deformity of trochlea

Differential Diagnosis:


Osteolytic bone tumor




 Rare but important complication after supracondylar humerus fractures.

AVN of the trochlea has a late clinical presentation. The cause of this complication is interruption of the trochlea blood supply.

AVN of the trochlea should be considered in patients with late presentation of pain or loss of motion after treatment of supracondylar humerus fractures.


Avascular Necrosis of Trochlea After Supracondylar Humerus Fractures in Children.Am J Orthop (Belle Mead NJ). 2015 Oct;44(10):E390-3.



Correct Answer
Total applicants 27 Correct answers 6
Name Institution
김지은 서울대학교병원, 전문의
최형인 군의관, 전문의
김기욱 국군수도병원, 전문의
백승진 분당차병원, 전공의
김성진 365병원, 전문의
박서영 전문의