Which joint is formed by the meeting of the clavicle and acromion?

The joint formed by the meeting of the clavicle and the acromion is known as the acromioclavicular joint. This joint is critical for shoulder stability and mobility, as it connects the clavicle (collarbone) to the acromion, which is a bony projection on the scapula (shoulder blade). The acromioclavicular joint allows for a range of movements, including elevation and rotation of the shoulder girdle.

In contrast, the shoulder joint, which is the ball-and-socket joint formed by the humerus and the glenoid cavity of the scapula, allows for a greater range of motion but is not specifically between the clavicle and acromion. The hip joint and knee joint pertain to different areas of the body (the pelvis and lower limb, respectively) and do not involve the clavicle or acromion at all. Thus, the acromioclavicular joint is the precise answer in identifying where these two bones meet.