Unicortical and bicortical plating in the fixation of comminuted fractures of the clavicle: a biomechanical study
| Autor: | Lincoln Corrêa, John M. Looft, Minoo Patel, Mathew Rawlings, David C. Ackland |
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| Rok vydání: | 2017 |
| Předmět: |
musculoskeletal diseases
medicine.medical_specialty Nonunion 03 medical and health sciences 0302 clinical medicine Cadaver Fracture fixation Bone plate medicine 030212 general & internal medicine Orthodontics 030222 orthopedics Osteosynthesis business.industry Biomechanics General Medicine equipment and supplies musculoskeletal system medicine.disease Surgery surgical procedures operative medicine.anatomical_structure Clavicle Bending stiffness business |
| Zdroj: | ANZ Journal of Surgery. 87:915-920 |
| ISSN: | 1445-1433 |
| DOI: | 10.1111/ans.14139 |
| Popis: | Background Intraoperative neurovascular complications with clavicle fracture fixation are often due to far cortex penetration by drills and screws, but could be avoided using a unicortical construct. The objective of this study was to compare the bending and torsional strength of a unicortical locking screw plate construct and a hybrid (with central locked and outer non-locked long oblique screws) unicortical plate construct for clavicle fracture fixation with that of a conventional bicortical locking screw construct of plate fixation. Methods Twenty-four human clavicle specimens were harvested and fractured in a comminuted mid-shaft butterfly configuration. Clavicles were randomly allocated to three surgical fixation groups: unicortical locking screw, bicortical locking screw and hybrid unicortical screw fixation. Clavicles were tested in torsion and cantilever bending. Construct bending and torsional stiffness were measured, as well as ultimate strength in bending. Results There were no significant differences in bending stiffness or ultimate bending moment between all three plating techniques. The unicortical locked construct had similar torsional stiffness compared with the bicortical locked construct; however, the hybrid technique was found to have significantly lower torsional stiffness to that of the bicortical locking screw construct (mean difference: 87.5 Nmm/degree, P = 0.028). Conclusions Unicortical locked screw plate fixation and hybrid unicortical plating fixation with centrally locked screws and outer long, oblique screws may alleviate far cortex penetration, protecting nearby anatomical structures, and may ease implant removal and conversion to bicortical fixation for revision surgery; however, use of long oblique screws may increase the risk of early loosening under torsion. |
| Databáze: | OpenAIRE |
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