Common causes of compartment syndrome include tibial or forearm fractures, ischemic reperfusion following injury, hemorrhage, vascular puncture, intravenous drug injection, casts, prolonged limb compression, crush injuries and burns.[4][5] Another possible cause can be the use of creatine monohydrate; a history of creatine use has been linked to this condition.[6][7] Compartment syndrome can also occur following surgery in the Lloyd Davis lithotomy position, where the patient's legs are elevated for prolonged periods. As of February 2001, any surgery that is expected to take longer than six hours to complete must include Compartment Syndrome on its list of post-operative complications. The Lloyd Davis lithotomy position can cause extra pressure on the calves and on the pneumatic pressure Flowtron boots worn by the patient.