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Biomechanical comparison of locked plating and spiral blade retrograde nailing of supracondylar femur fractures
- Source :
- Injury. 44:1340-1345
- Publication Year :
- 2013
- Publisher :
- Elsevier BV, 2013.
-
Abstract
- 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 ± 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.
- Subjects :
- Male
musculoskeletal diseases
medicine.medical_specialty
Bone Screws
Condylar plate
Locked plating
Bone Nails
Weight-Bearing
Fracture Fixation, Internal
Bone Density
Cadaver
medicine
Humans
Femur
Aged
General Environmental Science
Aged, 80 and over
Bone mineral
Orthodontics
business.industry
Biomechanics
musculoskeletal system
Biomechanical Phenomena
Surgery
Spiral blade
General Earth and Planetary Sciences
Female
Stress, Mechanical
Supracondylar femur fracture
business
Cadaveric spasm
Bone Plates
Femoral Fractures
Subjects
Details
- ISSN :
- 00201383
- Volume :
- 44
- Database :
- OpenAIRE
- Journal :
- Injury
- Accession number :
- edsair.doi.dedup.....ff62d154484bb88902eeb82b20eb28f0