This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Humerus Fractures, Subject name: Orthopaedics
Tardy ulnar nerve palsy is seen in - 
Select and explain. 
A. Medial condyle humerus, B. Lateral condyle humerus, C. Humerus shaft fracture, D. Fracture shaft radius
B: Lateral condyle humerus
Answer: B: Lateral condyle humerus 
Explanation: Ans. is 'b' i.e., Lateral condyle humerus o Causes of tardy ulnar nerve palsy are : -Main nited lateral condyle humerus fracture (cubitus valgus)Displaced medial epicondyle humerus fractureCubitus varus deformity' (due to supracondylar fracture humerus)Elbow dislocationContusions of ulnar nerveShallow ulnar grooveHypoplasia of humeral trochleaJoint deformity after prolonged arthritis of elbow