Deep wound on inner left arm. Bandages?

My friend suffered a deep wound on his left hand due to a bike accident. This happened 5 days back. The wound is present just besides the elbow and inner side of upper left hand arm. His hand is unmovable, unable to lift up his hand and also restricting side ways movement. For treatment he treated his wound with povidone iodine ointment for initial 2 days and later switched to Mupirocin ointment with regular dressings. Also did an x-ray of arm and elbow which showed no fracture. The wound is very deep as skin had came off and not just simple bruising. What is the best way to heal such a type of wound. Also how many days it will take to heal. Do we need to change the ointment for dressings? Also, should the dressings be kept open or closed with bandages?