Ac Joint Injury Radiology

It takes into account not only the acromioclavicular joint itself but also the coracoclavicular ligament the deltoid and trapezius.

Ac joint injury radiology. Imaging can be used to classify acromioclavicular injuries with the rockwood system most commonly used to classify injuries into six types. The trapezius and deltoid muscle attachments on the clavicle and acromion are completely stripped figs. The rockwood classification 1998 is the most common classification system in use for acromioclavicular joint injuries 3. In the workplace they can be caused by following objects and falling onto the outstretched hand.

Grade 3 acromioclavicular joint acj injury. Other described systems include the tossy and the allman classification systems. Authors have reported no specific mr imaging findings for this injury 18 19. Fall on shoulder is frequent mechanism of injury point tenderness limitation of motion.

In sports such as hockey or football they can be caused by hard checks or tackles. Radiographs may show mild swelling but are otherwise normal compared to the opposite side and with weight bearing. They are commonly caused by a downward force applied to the ac joint. Direct blows to the shoulder region.

The acromioclavicular ac joint radiographic series is used to evaluate the acromioclavicular joint and the distal clavicle. The acromioclavicular joint acj is a plane synovial joint diarthrodial joint of the pectoral girdle. Type v acromioclavicular joint injury figs. 5a and 5b is an exaggeration of the type iii injury.

And separation of the ac joint in a type iii ac joint separation. Injuries of the acromioclavicular joint acj are common particularly in males involved in contact sports. Ac radiographs are performed for a variety of indications including. Mr imaging appearance and classification of acromioclavicular joint injury gregory e.

Grade 1 injuries result from a sprain of the acromioclavicular ligament only without a complete tear fig 4a. Trudell 1 and donald resnick 1 audio available share. Acromioclavicular ac joint injuries are relatively common. From harris and harris radiology of emergency medicine.

The scapula has therefore lost all its major suspensory supports and droops inferiorly. This well known 6 type system is a modification of the earlier 3 class classification system described by allman 1967 2 and tossy 1963. Antonio 1 2 jae hyun cho 1 christine b. Gross anatomy the acromioclavicular joint is between the small facet of the convex distal clavicle and flat medial acromion.

Abnormal widening of the ac joint due to disruption of the ac ligament.