Acromioclavicular (AC) Joint Injuries Subluxation Dislocation Instability

The Acromioclavicular (AC) Joint is the small joint on top of the shoulder where the clavicle attaches. If the AC joint is hit head-on, such as when falling off a bike or tackling somebody without shoulder pads, the clavicle may detach, raise up and become noticeably 'out of joint'. A

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