The acromioclavicular joint (AC joint) is located at the top of the shoulder and is the junction between the acromion of the shoulder blade and the clavicle. This planar synovial joint is essential for the movement of the arm, especially when we lift our arm high or perform other complex movements. However, many people lack the necessary knowledge about the health of this joint, which may prevent them from responding promptly after an injury. This article will explore how to recognize subtle signs of AC joint injuries and explain the impact these injuries can have on your daily activities.
The stability of the AC joint mainly relies on the support of three ligaments, namely the acromioclavicular ligament, the coronoid acromial ligament and the coronoid clavicular ligament. Together, these ligaments form a protective structure that helps keep the shoulder joint stable and supports movement of the arm.
The AC joint acts as a pivot in shoulder movement, allowing for increased mobility of the scapula, thereby increasing the range of rotation of the arm.
Injuries to the AC joint are very common during sports. Many athletes suffer this injury after a collision or fall, a condition known as AC separation. The degree of separation is graded from I to VI depending on the degree of exercise. Mild separations may not require surgery, but as the severity of the injury increases, treatment options may become more complex.
Most grade I and II AC separations heal spontaneously; however, grade III injuries may result in significant shoulder deformity.
In addition to AC separation, degenerative changes in the AC joint (such as osteoarthritis) are also quite common. This may be due to past trauma or it may be due to long-term wear and tear and aging. Being aware of these common situations can help us respond more quickly when we feel uncomfortable.
Many times, injuries to the AC joint may not show obvious symptoms right away. Patients may experience mild pain or discomfort, which may be mistaken for muscle fatigue. Here are some subtle signs to help you recognize if you have an AC joint injury:
If you notice the above symptoms, it is important to seek professional medical help. Doctors usually use X-rays or MRI to diagnose the severity of the injury. For grade I and II injuries, conservative treatment is usually effective, including physical therapy and time to recover.
However, for more severe Grade III injuries, specialized surgical treatment may be necessary.
When participating in sports, pay attention to proper warm-up and stretching to reduce the risk of injury. Additionally, strengthening the shoulder's musculature provides increased support for the joint, which reduces the likelihood of injury. Proper training is just as important as adequate rest, as overuse can also lead to potential injury.
Armed with this information, are you ready to review your movement and shoulder health to identify any potential issues?