Ac Joint Ultrasound Anatomy

The shoulder is commonly evaluated with ultrasonography us with which various rotator cuff diseases can be effectively diagnosed including tendinosis tendon tear and bursitis 1 2 accuracies in the diagnosis of rotator cuff tears can reach 100 for full thickness tears and 91 for partial thickness tears. The acromioclavicular joint is between the small facet of the convex distal clavicle and flat medial acromion the articular surfaces are lined with fibrocartilage like the sternoclavicular joint it is an atypical synovial joint. The ac joint is formed by the junction of the lateral clavicle and the acromion process of the scapula and is a gliding or plane style synovial joint.

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4 traumatic arthritis can occur after injuries such as distal clavicle fractures or ac joint dislocations.

Ac joint ultrasound anatomy. The acromioclavicular joint is located at the top of the shoulder where the acromion process and the clavicle meet to form a joint see the following image. Anatomy technique and scanning pitfalls jon a. Comments are turned off. The acromioclavicular joint or ac joint is one of four joints that comprises the shoulder complex.

3 primary osteoarthritis is the leading cause of pain in the ac joint. Ultrasound guided procedures offer many advantages and direct visualization of the needle is key to a successful injection. Injections into the ac joint are usually performed for primary osteoarthritis traumatic osteoarthritis and distal clavicle osteolysis. An in plane technique as shown above means the needle path is parallel to the probe face optimizing the view of the needle.

Acromioclavicular joint injuries are often seen after bicycle wrecks contact sports and car accidents. Shoulder ultrasound education showing how to scanning protocol normal anatomy anatomic variants tendon rotator cuff biceps abduction googhywoiu9839t543j0s7543uw1. The ac joint attaches the scapula to the clavicle and serves as the main articulation that suspends the upper extremity from the trunk 160. The anatomy and biomechanics of the ac joint are described in greater detail separately.

See acromioclavicular joint injuries separated shoulder section on anatomy and biomechanics the ac joint normally degenerates over several decades but in most cases remains asymptomatic. However accuracy can be variable depending on the skill and experience of the. Jacobson md radiology volume 260 1 july 2011.