Your browser doesn't support javascript.
loading
Show: 20 | 50 | 100
Results 1 - 2 de 2
Filter
Add more filters










Database
Type of study
Language
Publication year range
1.
Acta Orthop Traumatol Turc ; 50(4): 432-6, 2016 Aug.
Article in English | MEDLINE | ID: mdl-27480211

ABSTRACT

OBJECTIVE: The role of plate configuration was found inconclusive on the biomechanical effects of the plate size and hole number for dual plate constructions in humeral shaft fractures. The purpose of this study was to test the biomechanical stability of various dual plate constructions. METHODS: Twenty-four left humeri (4th Generation Composite Humerus, Sawbones, Malmö, Sweden) with comminuted midshaft humeral fracture were used. Four groups of plate constructs were tested: laterally fixed 8-hole locking plate and screws were combined with anteriorly locking plates containing 0, 4, 6, or 8 holes in groups I, II, III, and IV, respectively. The alterations in axial, bending, and torsional angles were recorded. RESULTS: There were no fixation failures during axial, bending, or torsional stiffness testing within the elastic behavior limits. Axial stiffness was highest in Group IV. Torsional stiffness, posterior-to-anterior bending stiffness, lateral-to-medial bending stiffness, and medial-to-lateral bending stiffness were lowest in Group I. CONCLUSION: The similar stiffness values for the 8-to-4 hole and 8-to-6 hole plate constructions indicate that the 8-to-4 hole construction is an option in young adults, while the stiffest 8-to-8 hole combination may be an option for osteoporotic patients.


Subject(s)
Bone Plates , Fracture Fixation, Internal/methods , Fractures, Comminuted/surgery , Humeral Fractures/surgery , Stress, Mechanical , Biomechanical Phenomena , Bone Screws , Humans , Materials Testing , Prosthesis Design , Sweden
2.
Eklem Hastalik Cerrahisi ; 27(1): 22-8, 2016.
Article in English | MEDLINE | ID: mdl-26874631

ABSTRACT

OBJECTIVES: This study aims to biomechanically evaluate and compare four well-known types of terminal spinal constructs to a novel construct composed of a transpedicular screw with a lateral hook screw in terms of axial pullout strength in terminal vertebral segment fixation. MATERIALS AND METHODS: Forty fresh-frozen lamb spines were divided into five groups with eight spines each. To stabilize the transverse process, a pedicular screw alone was used in group 1, a sublaminar hook alone was used in group 2, a sublaminar hook and a pedicular screw were used in group 3, claw hook alone was used in group 4, and a pedicular screw with a lateral hook screw was used in group 5. Biomechanical tests were performed using an axial compression testing machine and two noncontact camera systems. RESULTS: The mean pullout strength value was 927 N for group 1, 626 N for group 2, 988 N for group 3, 972 N for group 4, and 1194 N for group 5. Pullout strength values were statistically significantly higher in groups 3 and 4 compared to groups 1 and 2. There was no statistically significant difference between groups 3 and 4. Pullout strength value of group 5 was statistically significantly higher than the other groups. CONCLUSION: Pedicular screw with a lateral hook screw had the highest fixation value. Lateral hook screw may assist to prevent pullout in patients with pullout risk and hyperkyphosis and after hyperkyphosis surgery. Further prospective clinical studies are needed to show the benefit of such a construct in reducing the risk of distal instrumentation pullout.


Subject(s)
Kyphosis/surgery , Lumbar Vertebrae/surgery , Orthopedic Procedures/instrumentation , Pedicle Screws , Postoperative Complications , Surgical Instruments , Thoracic Vertebrae/surgery , Animals , Biomechanical Phenomena , Bone Screws , Comparative Effectiveness Research , Orthopedic Procedures/adverse effects , Orthopedic Procedures/methods , Postoperative Complications/etiology , Postoperative Complications/prevention & control , Sheep
SELECTION OF CITATIONS
SEARCH DETAIL
...