Patients who require surgery for iliac crest bone graft (ICBG), pelvic osteotomy or spinal fusion will be screened for this multicenter, prospective, non-randomized, open-label study. All qualified subjects will be treated with the SurgiClot® haemostatic dressing (a completely soluble dressing consisting of solid nanofibers of electrospun dextran with embedded lyophilized human fibrinogen and thrombin proteins).