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  1. AC Joint (Acromioclavicular Joint): What It Is & Function

    Nov 6, 2024 · What is the AC joint? The AC joint is one of two joints that make up your shoulder. It’s where the acromion (the top part of your shoulder blade) meets your clavicle (collarbone). …

  2. AC Joint Pain: Treating Symptoms That Won’t Go Away

    Oct 9, 2025 · There are several causes for AC joint pain, and treatment varies depending on what's making your shoulder hurt. The AC joint is where the acromion (the tip of your shoulder …

  3. Acromioclavicular osteoarthritis: Causes and treatment

    Feb 16, 2023 · Acromioclavicular osteoarthritis is a common type of arthritis that affects the shoulder. It develops when the cartilage between the acromion and the collarbone wears down.

  4. Acromioclavicular Joint - Physiopedia

    The Acromioclavicular Joint, or AC Joint, is one of four joints that comprises the Shoulder complex. The AC Joint is formed by the junction of the lateral clavicle and the acromion …

  5. AC Joint Problems - Johns Hopkins Medicine

    The acromioclavicular, or AC, joint is a joint in the shoulder where two bones meet. One of these bones is the collarbone, or clavicle. The second bone is actually part of the shoulder blade …

  6. Acromioclavicular (AC) joint: Anatomy, function | Kenhub

    Nov 3, 2023 · The acromioclavicular (AC) joint is the articulation between the two bones of pectoral girdle; the clavicle and scapula. It is a plane synovial joint, with flat articular surfaces …

  7. The Acromioclavicular Joint - Structure - Movement

    Nov 6, 2025 · The acromioclavicular joint is an articulation in the shoulder region between the clavicle and the acromion of the scapula.It is a plane type synovial joint.

  8. Acromioclavicular (AC) Joint Injury (Shoulder Separation)

    The acromioclavicular (AC) joint — along with ligaments — connects your collarbone and shoulder blade. An injury to to the AC joint is a shoulder separation.

  9. Acromioclavicular joint disorders - UpToDate

    Jun 9, 2025 · The acromioclavicular (AC) joint unites the distal clavicle and the acromion of the scapula. It contains an intra-articular disc, a synovial membrane, and articular cartilage that …

  10. Disorders of the Acromioclavicular Joint - OrthoPaedia

    Patients with AC joint separations commonly present with pain after an athletic injury or fall onto the shoulder. Injuries to the joint rarely require surgical correction. They are generally …