Safety screw fixation technique in a case of coracoid base fracture with acromioclavicular dislocation and coracoid base cross-sectional size data from a computed axial tomography study
Coracoid base fracture accompanied by acromioclavicular joint dislocation with intact coracoclavicular ligaments is a rare injury. Generally, an open reduction with screw fixation is the first treatment choice, as it protects the important structures around the coracoid process. This report presents a new technique of screw fixation for coracoid base fracture and provides anatomic information on cross-sectional size of the coracoid base obtained by computed tomography (CT). An axial image of the coracoid base was visualized over the neck of the scapula, and a guidewire was inserted into this circle under fluoroscopic guidance. The wire was inserted easily into the neck of scapula across the coracoid base fracture with imaging in only 1 plane. In addition, 25 measurements of the coracoid base were made in 25 subjects on axial CT images. Average length of the long and short axes at the thinnest part of the coracoid base was 13.9 ± 2.0 mm (range 10.6–17.0) and 10.5 ± 2.2 mm (6.6–15.1), respectively. This new screw fixation technique and measurement data on the coracoid base may be beneficial for safety screw fixation of coracoid base fracture.
KeywordsAcromioclavicular joint dislocation Fracture of the coracoid base Screw fixation
Conflict of interest
None of the authors have any conflicts of interest or disclosures in relation this report.
- 3.Wilber MC, Evans EB (1977) Fractures of the scapula. An analysis of forty cases and a review of the literature. J Bone Joint Surg (Am) 59:358–362Google Scholar
- 4.Montgomery SP, Loyd RD (1977) Avulsion fracture of the coracoids epiphysis with acromioclavicular separation. Report of two cases in adolescents and review of the literature. J Bone Joint Surg (Am) 59:963–965Google Scholar
- 18.Eschler A, Gradl G, Gierer P, Mittlmeier T, Beck M (2012) Hook plate fixation for acromioclavicular joint separations restores coracoclavicular distance more accurately than PDS augmentation, however presents with a high rate of acromial osteolysis. Arch Orthop Trauma Surg 132:33–39PubMedCrossRefGoogle Scholar