PURPOSE: The aim of this study was to determine the biomechanical properties of four fixation options for periprosthetic supracondylar femoral fractures. METHODS: Fourth-generation composite femurs were implanted with a posterior-stabilizing femoral component of total knee arthroplasty. All femurs were osteotomized to produce a AO/OTA 33-A3 fracture pattern and four different constructs were tested: (1) non-locking plate; (2) polyaxial locking plate; (3) intramedullary fibular strut allograft with polyaxial locking plate; (4) retrograde intramedullary nail. The composite femurs underwent non-destructive tests to determine construct stiffness in axial and torsional cyclic loading. The final testing consisted of quasi-static axial loading until failure. RESULTS: Under cyclic torsional loading, the retrograde intramedullary nail was less stiff than non-locking plate, polyaxial locking plate and intramedullary fibular strut allograft with polyaxial locking plate (p = 0.046). No differences were detected in cyclic axial loading between the different constructs. During quasi-static axial loading to failure, the intramedullary nail achieved the highest axial stiffness while the non-locking plate showed the lowest (p = 0.036). CONCLUSIONS: The intramedullary fibular strut allograft with polyaxial locking plate did not prove to be significantly better to the polyaxial locking plate only in a periprosthetic distal femur fracture model.
PURPOSE: The aim of this study was to determine the biomechanical properties of four fixation options for periprosthetic supracondylar femoral fractures. METHODS: Fourth-generation composite femurs were implanted with a posterior-stabilizing femoral component of total knee arthroplasty. All femurs were osteotomized to produce a AO/OTA 33-A3 fracture pattern and four different constructs were tested: (1) non-locking plate; (2) polyaxial locking plate; (3) intramedullary fibular strut allograft with polyaxial locking plate; (4) retrograde intramedullary nail. The composite femurs underwent non-destructive tests to determine construct stiffness in axial and torsional cyclic loading. The final testing consisted of quasi-static axial loading until failure. RESULTS: Under cyclic torsional loading, the retrograde intramedullary nail was less stiff than non-locking plate, polyaxial locking plate and intramedullary fibular strut allograft with polyaxial locking plate (p = 0.046). No differences were detected in cyclic axial loading between the different constructs. During quasi-static axial loading to failure, the intramedullary nail achieved the highest axial stiffness while the non-locking plate showed the lowest (p = 0.036). CONCLUSIONS: The intramedullary fibular strut allograft with polyaxial locking plate did not prove to be significantly better to the polyaxial locking plate only in a periprosthetic distal femur fracture model.
Authors: Shahryar Ahmadi; Suraj Shah; Jay S Wunder; Emil H Schemitsch; Peter C Ferguson; Rad Zdero Journal: Proc Inst Mech Eng H Date: 2013-01 Impact factor: 1.617
Authors: John G Horneff; John A Scolaro; S Mehdi Jafari; Amer Mirza; Javad Parvizi; Samir Mehta Journal: Orthopedics Date: 2013-05 Impact factor: 1.390
Authors: José Carlos Minarro; Maria Teresa Urbano-Luque; Rafael Quevedo-Reinoso; Manuel Jesús López-Pulido; Ángel Fernández-González; Alberto Damián Delgado-Martínez Journal: Int Orthop Date: 2015-12-21 Impact factor: 3.075