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contentuptodate· Content· item f8_7_8319
©2013 UpToDate ® Print Email Acromioclavicular injury Type I Type I acromioclavicular (AC) injuries represent a sprain of the AC ligaments, while the coracoclavicular ligaments remain intact. Often no abnormality is seen on x-ray, but a slight widening of the AC joint may be apparent. Courtesy of Scott M Koehler, MD.