- 作者：Soroush Assari ; Alan Kaufmann ; Kurosh Darvish ; Jung Park ; Jonathan Haw ; Fayez Safadi ; Saqib Rehman
- 关键词：Supracondylar femur fracture ; Locking Condylar Plate ; Retrograde/Antegrade Femoral Nail ; Axial stiffness ; Postoperative weight-bearing
- 刊名：Injury
- 出版年：2013
- 出版时间：October, 2013
- 年：2013
- 卷：44
- 期：10
- 页码：1340-1345
- 全文大小：1631 K
Objective
Biomechanical comparison between locked plating and retrograde nailing of supracondylar femur fractures with simulated postoperative weight-bearing.Methods
The Locking Condylar Plate (LCP) and Retrograde/Antegrade EX Femoral Nail (RAFN) were tested using 10 paired elderly cadaveric femurs, divided into Normal and Low Bone Mineral Density (BMD) groups, with a simulated AO/OTA type 33-A3 supracondylar femur fracture. Each specimen was subjected to 200,000 loading cycles in an attempt to simulate six weeks of postoperative recovery with full weight-bearing for an average individual. The construct's subsidence due to cyclic loading, and axial stiffness before and after the cyclic loading were measured and their correlation with BMD was studied. The two implants were compared in a paired study within each BMD group.
Results
LCP constructs showed higher axial stiffness compared to RAFN for both Normal and Low BMD groups (80 % and 57 % , respectively). After cyclic loading, axial stiffness of both constructs decreased by 20 % and RAFN constructs resulted in twice as much subsidence (1.9 ¡À 0.6 mm). Two RAFN constructs with Low BMD failed after a few cycles whereas the matched pairs fixed with LCP failed after 70,000 cycles.
Conclusions
The RAFN constructs experienced greater subsidence and reduced axial stiffness compared to the LCP constructs. In Low BMD specimens, the RAFN constructs had a higher risk of failure.