This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Injuries Around Arm & Elbow, Subject name: Orthopaedics
Tardy ulnar nerve palsy occurs in fracture involving 
Select and explain. 
A. Medial condyle, B. Lateral condyle, C. Olecranon, D. Medial condyle
B: Lateral condyle
Answer: B: Lateral condyle 
Explanation: Ans. b (Lateral condyle) (Ref. Maheshwari orthopedics 4th/87)Complications of fracture of lateral condyle of humerus^# Nonunion# Cubitus valgus deformity- May reult in late ulnar nerve palsy (tardy ulnar nerve palsy)- Mild deformity needs no Rx- Moderate to severe may need supracondylar osteotomy.- Anterior transposition of ulnar nerve in early tardy ulnar nerve palsy.# OA of elbow.Fracture medial epicondyle of humerus^# More common than fracture of lateral epicondyle# Associated with posterior dislocation of elbow# May be associated with ulnar nerve injury.Complications of intercondylar fracture of humerus^# Stiffness of elbow (may be associated with myositis ossificans)# Malunion (may lead to cubitus valgus/varus deformity)# OAComplications of supracondylar fracture of humerus||||Immediate (at time of )Early (within 1st 2-3 days)Late (weeks to months after )1. Injury to brachial artery2. Injury to radial & median nerve1. Volkman's Ischemia (Mcly affected=FPL & medial FDP)1. Malunion ("Gun-stock" deformity; cubitus varus; commonest complication;Rx is french osteotomy)2. Myositis ossificans3. VIC (Rx is turn-buckle splint/ Maxpage operation).