This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Lower Limb Traumatology, Subject name: Orthopaedics
Earliest sign of compament syndrome of leg is: 
Select and explain. 
A. Tingling or numbness, B. Skin mottling, C. Pulselessness, D. Pain on Passive stretch
D: Pain on Passive stretch
Answer: D: Pain on Passive stretch 
Explanation: COMPAMENT SYNDROME There is increase pressure in closed fascial space due to inflammatory reactions due to which muscles fibres undergo ischemia and fibrosis as a long term complication . Compament syndrome of leg - most commonly involves deep posterior compament of leg >deep flexor compament of forearm 5P's of compament syndrome pain out of propoion,pulselessness,pallor, parasthesia, paralysis Earliest sign is pain on passive stretch Earliest symptom is pain out of propoion of injury It has normal pulse since only micro-circulation is affected