This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Orthopaedics
In posterior compartment syndrome which passive movement causes pain? 
Select and explain. 
A. Dorsiflexion of foot, B. Foot inversion, C. Toe dorsiflexion, D. Toe planter flexion
A: Dorsiflexion of foot
Answer: A: Dorsiflexion of foot 
Explanation: It is possible to stretch the affected muscles by passively moving the joints in a direction opposite to that of the damaged muscle action:-

Passive extension of fingers produces pain in flexor compartment syndrome of the forearm.
Dorsiflexion of foot produces pain in the posterior compartment of the leg
Plantar flexion produces pain in the anterior compartment of the leg.