Your shoulder would win many design awards if we had made it in a lab rather than over ions of evolution. It’s an amazing bit of engineering that allows a wide degree of motion in your arm — everything from smashing a tennis ball to paddling out through the break at Trestles to throwing a curveball. The shoulder consists of several joints and an assortment of tendons and muscles.

But complexity has its shortcomings; the shoulder can be a source of pain and weakness, both from acute injury and also from the simple effects of wear and tear. From tearing the rotator cuff (Dodger pitcher Tommy John made that injury famous) to separating the shoulder to AC joint pain, myriad issues can develop with the shoulder

At Orthopaedic Surgery & Sports Medicine, Dr. Dini is all about diagnosing and treating your shoulder problems. Here are some of the most common factors causing your shoulder pain.


Your shoulder consists of three bones: the upper arm bone (humerus), the shoulder blade (scapula), and the collarbone (clavicle). The head of the humerus fits into a socket in the shoulder blade. A combination of muscles and tendons, known as the rotator cuff, keeps the humerus centered in the socket. They attach the humerus to the shoulder blade.


Your shoulder pain usually comes from one of four areas: tendon issues, instability, fracture, or arthritis. Here’s a more detailed breakdown.

If you have shoulder pain, finding the cause is the first step toward providing relief. That’s Dr. Dini’s focus at Orthpaedic Surgery & Sports Medicine. He has extensive experience with sports injuries and can help with your shoulder. If you have lasting pain or weakness, call us at our Los Angeles office, (323) 525-0101, or our Encino office, (818) 784-1020, to make an appointment.

You Might Also Enjoy...

Tips for Managing Joint Pain Over the Holidays

Chronic joint pain can put a damper on the joy of the holiday season, but if you prepare and plan ahead of time, you may be able to avoid additional pain. Here are our tips for managing joint pain during the winter holidays.

The Most Common Causes of Hip Pain

Your hip is the largest and one of the most durable joints in your body. As strong as it is though, it’s still vulnerable to injury. This post describes some of the most common causes of hip pain.

Posture Matters on the Job

You spend a lot of time at work. Even if your job isn’t physically demanding, it’s likely having an impact on your body. This post discusses why posture is important, especially if you have a desk job.

Treatment Options for Knee Arthritis

If you’re developing arthritis in your knee, you may be wondering what kinds of treatments are available. There are several treatment options, depending on the state of your overall health and how advanced your knee arthritis is.

6 Things that Can Cause an Achilles Tendon Rupture

Your Achilles tendon is critical to your ability to walk. If it ruptures, you ‘re likely to feel intense pain, and you may need surgery to repair the injury. This post describes common ways people rupture their Achilles tendons.