Fixation of distal clavicle fractures with coracoclavicular instability: a comparative biomechanical study in human cadavers

JSES International

Paul Borbas, MD¹  Karl Wieser, MD²  Christina Villefort, MD²  Christoph J. Laux, MD²  Simon Hofstede²  Lukas Ernstbrunner, MD, PhD³ 

[1] Corresponding author: Christoph J. Laux, MD, Balgrist University Hospital, Department of Orthopaedics, University of Zürich, Forchstrasse 340, 8008 Zürich, Switzerland.;Department of Orthopaedics, Balgrist University Hospital, University of Zürich, Zürich, Switzerland;Laboratory for Orthopaedic Biomechanics, Institute for Biomechanics, ETH Zürich, Zürich, Switzerland;

关键词: Distal clavicle fracture;    Coracoclavicular instability;    Coracoclavicular ligaments;    Cow-hitch;    Suture repair;    Biomechanical properties;   

DOI  :  

来源: DOAJ

【 摘 要 】

Background: The need for coracoclavicular (CC) stabilization in the fixation of fractures with CC instability (Neer type IIB and V) was biomechanically demonstrated by higher construct strength than isolated locking plate osteosynthesis. It was the purpose of this study to prove noninferiority of the new cow-hitch suture repair technique compared with the well-established suture tape double-button fixation with regard to overall fixation strength and cyclic loading properties. Methods: Twelve human cadaver shoulders (7 right and 5 left) were matched for sex and age (mean age: 75 ± 5 years). An oblique parasagittal fracture line 20 mm medial to the acromioclavicular joint line was created, and the CC ligaments were dissected. Six shoulders were reconstructed by a double FiberTape fixation with two suture buttons (group DB), and the remaining six shoulders by a cow-hitch suture repair using a double FiberWire with only coracoid button fixation (group CH). Both reconstruction techniques were tested in a servo-hydraulic material testing machine for cyclic displacement (mm), stiffness (N/mm), and maximum load-to-failure (N) after 500 cycles at 3 mm/s and inferosuperior load between 15 and 70 N. Superior fragment displacement in space was recorded using a MicroScribe digitizer. Results: There were no statistically significant differences regarding cyclic displacement (group DB: 0.7 mm; group CH: 1.3 mm; P = .36), stiffness (group DB: 177 N/mm; group CH: 116 N/mm; P = .17), maximum load-to-failure (group DB: 560 N; group CH: 492 N; P = .59), and superior displacement in space of the medial fragment (group DB: 3.2 mm; group CH: 1.6 mm; P = .48). Conclusion: Fixation of unstable distal clavicle fractures using a double FiberWire cow-hitch suture repair with isolated coracoid button fixation for stand-alone CC stabilization resulted in similar biomechanical properties to a double-suture button fixation with FiberTapes while avoiding prominent clavicular implants.

【 授权许可】

Unknown