Study To Assess FRacTure Healing With SclerosTin Antibody - Hip

Inclusion Criteria: * Males and females, age 55 to 95 years * fresh unilateral low energy intertrochanteric or femoral neck fracture as the primary injury, confirmed by X-ray and in the opinion of the treating surgeon amenable to repair by internal fixation * internal fixation of the fracture with devices approved by local regulatory agency, performed no later than 7 days after injury for intertrochanteric or undisplaced femoral neck fractures and no later than 2 days after injury for displaced femoral neck fractures * intertrochanteric fracture: sliding hip screw or IM nail * femoral neck fracture: sliding hip screw or at least 3 cancellous screws Exclusion Criteria: * severe symptomatic osteoarthritis of the lower extremity * inability to independently rise from armchair or walk 200 meters before hip fracture * presence of concomitant injuries such as rib fractures, wrist fractures, or acute symptomatic vertebral fractures which severely impair the ability to rise from a chair * associated extremity injuries including ipsilateral or contralateral fractures of the foot, tibia or fibula, wrist, humerus, femoral shaft, femoral head or hip dislocation, that may delay weight-bearing beyond one week after surgery * head-injury, as defined by Glasgow Coma Scale \< 13 prior to randomization * use of bone grafts or bone substitutes at the time of fracture fixation * major polytrauma or significant axial trauma, with Injury Severity Score \> 16 * pathological fracture or hist…