• Yu-Ren Du, Jian-Xiong Ma, WangShuoSDepartment of Orthopaedics, Tianjin Hospital, Tianjin, China.Department of Orthopaedics, the No. 464 Hospital of People's Liberation Army, Tianjin, China., Lei Sun, Ying Wang, Bin Lu, Hao-Hao Bai, Yong-Cheng Hu, and Xin-Long Ma.
• Department of Orthopaedics, Tianjin Medical University General Hospital, Tianjin, China.
• Orthop Surg. 2019 Apr 1; 11 (2): 311-317.

ObjectiveTo compare the biomechanical stabilities of less invasive stabilization system (LISS) plate and retrograde intramedullary nail (IMN) for the comminuted femoral supracondylar fracture fractures in the elderly.MethodsSixteen pairs of embalmed cadaver femurs were obtained to simulate a comminuted supracondylar femur fracture (AO/OTA33-A3) gap model. All left-side specimens were fixed with LISS plate, and retrograde IMN were applied to the right-side specimens. All specimens were tested in torsional, axial and cyclic load mode on an Instron testing machine.ResultsThe mean torsional stiffness for LISS plate group was 34.1% greater than retrograde IMN group (2.90 vs. 1.91 Nm/degree, P = 0.002), but the mean axial stiffness was greater for the retrograde IMN (199.16 vs. 303.93 N/mm, P < 0.001). The total deformation of LISS plate caused by cyclic axial loading was greater than retrograde IMN (4.17 vs. 3.57 mm, P = 0.014). Significantly less mean irreversible deformation was detected in LISS plate than in retrograde IMN (1.64 vs. 1.69 mm, P = 0.699). Failure loads of the constructs were significantly different between the two groups (LISS plate: 2941±128 N; retrograde IMN: 4022±176 N, P < 0.001).ConclusionFor comminuted femoral supracondylar fractures in the elderly, the tested instruments can both maintain sufficient biomechanical stabilities, but retrograde IMN is superior to LISS plate in deformation of fracture site.© 2019 The Authors. Orthopaedic Surgery published by Chinese Orthopaedic Association and John Wiley & Sons Australia, Ltd.

26 keywords...

hide…