Clinics in Shoulder and Elbow

Korean Shoulder and Elbow Society (대한견·주관절의학회)
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Evaluation of the Acromioclavicular Joint Morphology for Minimizing Subacromial Erosion after Surgical Fixation of the Joint Using a Clavicular Hook Plate

  • Kim, Sung-Jae (Department of Orthopaedic Surgery, Dongtan Sacred Heart Hospital, Hallym University College of Medicine) ;
  • Kee, Young-Moon (Department of Orthopaedic Surgery, Gwangmyeong Saeum Hospital) ;
  • Park, Dong-Hyuck (Department of Orthopaedic Surgery, Hanyang University College of Medicine) ;
  • Ko, Young-Il (Department of Orthopaedic Surgery, Hanyang University College of Medicine) ;
  • Lee, Bong-Gun (Department of Orthopaedic Surgery, Hanyang University College of Medicine)
  • Received : 2018.06.07
  • Accepted : 2018.07.08
  • Published : 2018.09.01
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Abstract

Background: Subacromial erosion remains a major concern after surgical fixation of acromioclavicular (AC) joint using a clavicular hook plate. To minimize postoperative subacromial erosion, we investigated the structural relationship between distal clavicle and acromion around the AC joint by considering the surgical fixation of the joint using the hook plate technique. Methods: Computed tomography scans of 101 AC joints without any inherent pathology were analyzed. The angle between the distal clavicle and acromion around the AC joint (AC angle), depth of the acromion, differences in height between distal clavicle and acromion (AC height difference), and thickness of distal clavicle and acromion at the AC joint were measured. Descriptive statistics were calculated for each anatomical parameter, and all results were compared between gender groups. Results: The mean AC angle was $17.1^{\circ}$(range, $-8.0^{\circ}$ to $39.0^{\circ}$), and the mean AC height difference was 3.5 mm (range, -0.7 to 8.7 mm). Both factors showed very high variability (coefficients of variation=62.6% and 46.6%, respectively). The mean AC angle was significantly higher in the female gender than in the male gender ($19.8^{\circ}$ vs. $13.8^{\circ}$, p=0.048). The mean acromion thickness and distal clavicular thickness were both significantly thinner in the female group than in the male group (p<0.001). Conclusions: Taken together, we believe our results might be helpful in minimizing postoperative subacromial erosion when performing surgical fixation of the AC joint using the hook plate, and be valuable in improving future design of the hook plate.

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References

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