**Question:** Traction epiphysis is/are:

A. Salter-Harris type I
B. Salter-Harris type II
C. Salter-Harris type III
D. Salter-Harris type IV

**Correct Answer:**

**Core Concept:** Traction epiphysis is a type of fracture involving the physis (growth plate) of long bones, particularly in children and adolescents. These fractures occur due to external mechanical force applied to the extremity in a manner that does not cause a complete separation of the physis.

**Why the Correct Answer is Right:** The correct answer, Salter-Harris types I, II, III, and IV, represent the four main subtypes of traction epiphysis. In each type, the growth plate is stretched and deformed instead of being completely disrupted.

**Why Each Wrong Option is Incorrect:**

A. Salter-Harris type I: In this subtype, there is a partial articular surface fracture with intact physis. The answer is incorrect because it describes a different fracture type.

B. Salter-Harris type II: This type involves a fracture line passing through the physis, with the articular surface being affected. The answer is incorrect because it describes a different fracture type.

C. Salter-Harris type III: This type includes a fracture line passing through the physis with the articular surface involved. The answer is incorrect because it describes a different fracture type.

D. Salter-Harris type IV: This type involves a fracture line passing through the physis and articular surface, with the physis being avulsed from the epiphysis. The answer is incorrect because it describes a different fracture type (an avulsion fracture).

**Clinical Pearl:** Traction epiphysis is a relatively common injury in pediatric patients, typically occurring during sports activities or falls. Early recognition and treatment are crucial to prevent complications like growth disturbances and angular deformities.