Complications
Rotator cuff syndrome An acute strain of the acromioclavicular joint is sometimes followed by supraspinatus tendinitis. Whether this is directly due to the primary injury or whether it results from post-traumatic oedema or inflammation of the overlying acromioclavicular joint is unclear. Treatment with anti-inflammatory preparations may help.
Unreduced dislocation An unreduced dislocation is ugly and sometimes affects function. Simple excision of the distal clavicle will only make matters worse. An attempt should be made to reconstruct the coracoclavicular ligament. The Weaver–Dunn procedure may be suitable (See Figure 24.8).
Ossification of the ligaments The more severe injuries are quite often followed by ossification of the coracoclavicular ligaments. Bony spurs may predispose to later rotator cuff dysfunction, which may require operative treatment.
Secondary osteoarthritis A late complication of Type I and II injuries is osteoarthritis of the acromioclavicular joint. This can usually be managed conservatively, but if pain is marked the outer 2 cm of the clavicle can be excised. The patient will be aware of some weakness during strenuous over-arm activities and pain is often not completely abolished.
---from 《Apley’s System of Orthopaedics and Fractures》
重点词汇整理：
Rotator cuff 肩袖 旋转肌群/kʌf/n. 袖口，裤子翻边；手铐；一巴掌
supraspinatus tendinitis冈上肌肌腱炎 /,tendi'naitis/n. 腱炎
dotted lines点状虚线
Ossification /ˌɑːsɪfɪˈkeɪʃn/n. 骨化；成骨；（思想的）僵化
Bony spurs截骨面的新生骨突;骨刺
predispose /ˌpriːdɪˈspoʊz/vt. 预先处置；使…偏向于
if pain is marked the outer 2 cm of the clavicle can be excised.如果在锁骨外2厘米处有疼痛，可以切除。
百度翻译：
并发症
肩袖综合征肩锁关节急性劳损，有时伴有冈上肌炎。目前尚不清楚这是直接由原发性损伤所致，还是由创伤后肩锁关节水肿或炎症所致。用抗炎药治疗可能有帮助。
未复位脱位一个未复位脱位是丑陋的，有时影响功能。单纯切除锁骨远端只会使情况更糟。应尝试重建喙锁韧带。Weaver-Dunn程序可能是合适的（见图24.8）。
韧带骨化较严重的损伤往往伴随着喙锁韧带骨化。骨刺可能导致晚期肩袖功能障碍，需要手术治疗。
继发性骨关节炎I型和II型损伤的晚期并发症是肩锁关节骨关节炎。这通常可以保守处理，但如果疼痛是标记的锁骨外2厘米可以切除。患者在剧烈的上臂活动中会意识到一些弱点，疼痛通常不会完全消除。
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