This cadaveric biomechanical study uses a computer-controlled in vitro elbow simulator to test how radial head excision and metallic radial head arthroplasty affect elbow kinematics and varus-valgus stability across four ligamentous states — intact, MCL-deficient, LCL-deficient, and combined MCL+LCL-deficient — answering whether arthroplasty alone is sufficient to restore stability after complex elbow injuries.
When you see a comminuted radial head fracture associated with elbow dislocation or collateral ligament disruption, radial head arthroplasty is necessary but not sufficient — always assess and repair the collateral ligaments and muscular origins at the same sitting, or you will leave the elbow unstable.
Postoperatively, LCL-injured elbows should be rehabilitated with the forearm pronated, which biomechanically improves lateral-side stability.
This cadaveric biomechanical study uses a computer-controlled in vitro elbow simulator to test how radial head excision and metallic radial head arthroplasty affect elbow kinematics and varus-valgus stability across four ligamentous states — intact, MCL-deficient, LCL-deficient, and combined MCL+LCL-deficient — answering whether arthroplasty alone is sufficient to restore stability after complex elbow injuries.
When you see a comminuted radial head fracture associated with elbow dislocation or collateral ligament disruption, radial head arthroplasty is necessary but not sufficient — always assess and repair the collateral ligaments and muscular origins at the same sitting, or you will leave the elbow unstable.
Postoperatively, LCL-injured elbows should be rehabilitated with the forearm pronated, which biomechanically improves lateral-side stability.