Inferomedial cortical bone contact and fixation with calcar screws on the dynamic and static mechanical stability of proximal humerus fractures

Autor: Bangjun Cheng, Xiaofeng Zhang, Qi Chen, Lin Zhao, Jun-wu Huang, Yanfeng Huang, Weibing Chen, Hanxin Mao, Yi Luo
Rok vydání: 2018
Předmět:
musculoskeletal diseases
medicine.medical_specialty
Proximal humerus
lcsh:Diseases of the musculoskeletal system
Calcar screw
Compressive Strength
Bone Screws
03 medical and health sciences
Fixation (surgical)
Random Allocation
0302 clinical medicine
lcsh:Orthopedic surgery
Materials Testing
Inferomedial cortical bone
medicine
Cortical Bone
Humans
Orthopedics and Sports Medicine
Biomechanics
Proximal humeral fracture
030203 arthritis & rheumatology
Orthodontics
030222 orthopedics
Calcar
business.industry
equipment and supplies
musculoskeletal system
Static and dynamic stability
lcsh:RD701-811
medicine.anatomical_structure
surgical procedures
operative
Mechanical stability
Bending stiffness
Orthopedic surgery
Shoulder Fractures
Surgery
Cortical bone
lcsh:RC925-935
business
Research Article
Locking plate
Zdroj: Journal of Orthopaedic Surgery and Research
Journal of Orthopaedic Surgery and Research, Vol 14, Iss 1, Pp 1-8 (2019)
ISSN: 1749-799X
Popis: Background This study aimed to explore the effect of retaining inferomedial cortical bone contact and fixation with calcar screws on the dynamic and static mechanical stability of proximal humerus fractures treated with a locking plate. Methods Twelve Synbone prosthetic humeri (SYNBONE-AG, Switzerland) were used for a wedge osteotomy model at the proximal humerus, in four groups. In the cortex contact + screw fixation group and cortex contact group, the inferomedial cortical bone contact was retained. In the screw fixation group and control group, the inferomedial cortical bone contact was not retained. Calcar screw fixation was implemented only in the screw fixation groups. The dynamic and static mechanical stability of the models were tested with dynamic fatigue mechanics testing, quasi-static axial compression, three-point bending, and torsion testing. Results The cortex contact + screw fixation group showed the longest fatigue life and the best stability. There was 35% difference in fatigue life between the cortex contact + screw fixation group and the cortex contact group, 43%between the cortex contact + screw fixation group and screw fixation group, and 63% between the cortex contact + screw fixation group and screw fixation group (P
Databáze: OpenAIRE
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