(Introduction) Shoulder surgeons often perform osteotomy of the tip of the coracoid process to expose the shoulder joint and stabilize the tip to its original position. To fix this firmly, it is important to make a hole in the center of the coracoid before the osteotomy. Because of the coraco-acromial ligament, the teres minor and the conjoined tendon attached to the coracoid process, it is difficult to define the direction and thickness of the coracoid process. We have developed a drill guide to ease the was to make a hole in the center of the coracoid process.
(Method) In 80 shoulder x-rays, the length of the coracoid process was measured in the axial view and its thickness was measured in the antero-posterior view in the fully elevated position. There were 48males and 32 females, ranging from 17 to 39 years old (average 23.4).
(Results) The average length of the coracoid process was 3.7cm and its average thickness was 0.88cm. A drill guide was made based on these data.
(Configuration of the drill guide) The drill guide has a hook and a drill sleeve that slants toward the hook. The distance between the drill sleeve and the hook can be changed from 20 to 60 mm. In order to make a hole in the coradoid process, the hook of the drill guide is placed on the bottom of the process and the drill sleeve is lengthened to the top of the process. A surgeon does not need to hold the drill guide, because the drill guide has a locking system which holds the coracoid process.
(Conclusion) We can drill a hole easily in the center of the coracoid process using this drill guide.
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