Morphological Analysis of Acromioclavicular Joint using Reconstructed
3D CT Model and the Contact Characteristics with Hook Plate in
Subacromial Space
Jong Pil Yoon, Ji-Soo Kim , Yeon Soo Lee*, Geun Soo Song*, Joo Han Oh†
Department of Orthopaedic Surgery, Kyung Pook National University*, School of Medicine, Daegu,
*Department of Biomedical Engineering, Catholic University of Daegu, College of Medical Science,
Daegu,
†Department of Orthopaedic Surgery, Seoul National University, College of Medicine, Seoul,
Korea
Objectives
Acromioclavicular (AC) joint dislocation is a common sports injury, and the hook
plate fixation is widely used recently to promote the natural ligament healing. It
has demonstrated good clinical outcomes, but subacromial erosion and
impingement have been frequently observed postoperatively. To reduce these
complications and to develop the plate design, we quantified and analyzed AC
joint morphology and plate contouring using 3D reconstruction model of CT scan.
Material and Methods
We evaluated 3D reconstructed model of AC joint from CT scans of 26 patients
(13 male, 13 female, mean age 61.4 years) using Rapidform and MiMics
software, and measured several anatomical parameters. For the subacromial
positioning of the hook plate, we scanned real hook plate, and estimated the
contact between the hook plate and acromion.
Results
In 3D reconstruction model, the mean thickness of acromion was 9.7 ± 1.5 mm
(male 10.6 mm, female 8.8 mm), the mean thickness of distal clavicle was 11.3 ±
1.6 mm (male 12 mm, female 10.5 mm), and the mean width of acromion was 29
± 3.6 mm. The mean inclination angle between hook plate and acromion was
31.5 ± 8.7˚ (male 29.8˚, female 33.1˚). The hook plate made point contact with
acromion at 9.1 ± 3.4mm (30.8 %) from the lateral end of acromion.
Conclusions
The current study demonstrated the anatomical data of AC joint for using hook
plate and revealed the stress concentration phenomenon of the hook plate due to
the excessive inclination and occupation of subacromial space. Further
investigation and advancement of plate design is mandatory.
Abstract
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Date
A044
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02 August 2013
Presenter Details
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Jong Pil Yoon
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Korea
, Kyungpook National University Hospital
82-10-7102-7879
jpyoon@knu.ac.kr
Orthopaedic Surgeon
Abstract Details
Morphological Analysis of Acromioclavicular Joint using
Reconstructed 3D CT Model and the Contact Characteristics with
Hook Plate in Subacromial Space
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Free Paper Presentation
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Shoulder
The Abstract :
Abstract__Morphological_Analysis_of_Acromioclavicular_Joint.docx