In compartment syndrome earliest finding is
Ans: a (Pain on passive..) Ref Rocksvood& Greens 6th edPain is considered to be the first symptom of acute compartment syndrome. The pain experienced by the patient is by nature ischemic and usually severe and out of proportion to the clinical situation.Symptoms and signs of compartment syndromeThere are classically 5 "Ps" associated with compartment syndrome.Pain out of proportion to what is expectedParaesthesia allorParalysisPulselessnessA 6th P, for polar/poikilothermia (i.e. cold) is added.Of these only the first two are reliable in the latter stages of compartment syndrome.
Pain on passive movement
Parasthesia
Absence of pulse
Pallor
Complications In  Orthopedics