My husband has a tibial fracture on 7 November but due to severe burn on knee area doctor has done external fixation in place of surgery till the burnt area completely cure and after 12 days on 20 nov there was a surgery nd they implant plates .after that every thing is fine but after 3-4 days he feel muscles stiffness in his fractured leg and this stiffness is worse during night he is not able to sleep at night. I want to ask is this normal?