• The safety outcome is the incidence of secondary fracture displacement among subjects treated with rhBMP-2/CPM compared to those receiving standard surgical treatment (internal fixation) alone. [ Time Frame: Safety will be established if, upon completion of the first 6 months of follow-up, key safety outcomes in the active treatment groups are comparable in clinical characteristic and severity to those of the sOC control group ] [ Designated as safety issue: Yes ]
  

Inclusion Criteria:

• Age 55 or older.
• Acute fracture of the proximal femur: displaced femoral neck fracture or unstable intertrochanteric femur fracture.
• Anatomic reduction (open or closed) and internal fixation within 48 hours following injury using any one of the following fixation constructs: 1) multiple parallel interfragmentary screws; 2)sliding hip screw and side plate fixation; or 3) cephalomedullary nail.

Exclusion Criteria:

• Concurrent fractures of the ipsilateral or contralateral lower extremity that would impede performance on functional assessments.
• Previous arthroplasty of contralateral (unaffected) hip.
• Planned procedure(s) to stimulate fracture healing after internal fixation of the fractured hip.