The most common cause of Volkmann’s ischaemic contracture (V.I.C) in a child is:
**Core Concept**
Volkmann's ischaemic contracture (V.I.C) is a debilitating condition resulting from prolonged ischaemia of the forearm muscles, leading to fibrosis and contracture. This condition is often associated with traumatic injuries, particularly those involving compartment syndrome.
**Why the Correct Answer is Right**
The most common cause of V.I.C in children is iatrogenic injury, specifically tight and constrictive casts applied to the affected limb. These casts can lead to increased intra-compartmental pressure, compromising blood flow to the muscles and nerves, ultimately resulting in ischaemia and contracture. The pathophysiology involves the compromise of the nutrient arteries supplying the forearm muscles, leading to muscle fibre necrosis and subsequent contracture. The affected muscles are primarily the flexors of the wrist and fingers.
**Why Each Wrong Option is Incorrect**
* **Option A:** While tight casts are indeed a common cause of V.I.C, the other options are not directly related to this condition.
* **Option B:** Although compartment syndrome is a contributing factor to V.I.C, it is not the primary cause.
* **Option D:** This option is not directly related to the development of V.I.C.
**Clinical Pearl / High-Yield Fact**
The "6 Ps" of compartment syndrome are: pain, pallor, pulselessness, poikilothermia, paresthesia, and paralysis. In the context of V.I.C, early recognition and intervention are crucial to prevent long-term disability.
**Correct Answer: C. Tight casts.**