- • Subject with an isolated tibial shaft fracture requiring intramedullary nailing, or bicondylar tibial plateau fracture or tibial plateau fracture-knee dislocation requiring application of a knee-spanning external fixator. OR Subject with an isolated tibial shaft fracture requiring intramedullary nailing, or bicondylar tibial plateau fracture or tibial plateau fracture-knee dislocation requiring application of a knee-spanning external fixator AND another major fracture in a different body region or injuries to one other major organ system (head, chest, abdomen, pelvis, genitourinary, or spine) excluding those with injuries to the opposite leg that would preclude them from completing required tests (see exclusion criteria).