Pectoralis Major Tendon Ruptures

The pectoralis major muscle originates from the clavicle (collarbone), sternum (breastbone), and upper ribs. Its fibers converge into a thick tendon that attaches to the upper portion of the humerus (upper arm bone), near the shoulder. The muscle has two heads:

• The clavicular head, which helps lift the arm forward and upward.
• The sternal head, which brings the arm inward and downward toward the body.

During powerful movements—like pressing or throwing—the pectoralis major generates large forces across the tendon attachment. If the tendon is suddenly overloaded, especially while the arm is extended or externally rotated (as in the lowering phase of a bench press), it can tear away from the bone.

Most ruptures occur at the tendon’s attachment to the humerus, though tears can also occur within the muscle belly or at the junction between muscle and tendon.

While relatively uncommon compared to other sports injuries, pectoralis major ruptures have become more frequent in recent years due to the popularity of high-intensity resistance training and powerlifting.

They are seen most often in:

• Men between 20 and 50 years old, particularly those who weight train.
• Athletes involved in football, wrestling, rugby, or martial arts.
• Individuals using anabolic steroids, which can weaken tendons relative to muscle strength.

Studies show that the majority of cases occur during eccentric contraction—when the muscle lengthens while under tension, such as lowering the bar in a bench press.

Diagnosis begins with a detailed history and physical examination. Dr. José Vega, Cleveland’s trusted orthopedic shoulder and sports medicine specialist, will ask how the injury occurred, what you felt at the time, and whether you noticed bruising or deformity afterward.

Common signs and symptoms include:

• A sharp tearing or popping sensation in the chest or shoulder
• Immediate pain and weakness with pushing or lifting
• Bruising that spreads across the chest and upper arm
• Visible or palpable defect near the armpit or upper chest
• Difficulty bringing the arm across the body or performing pressing motions

During the exam, Dr. Vega will assess shoulder strength and compare the injured side with the uninjured side.

Imaging tests help confirm the diagnosis:

• MRI is the gold standard and can determine the location and extent of the tear—whether it’s partial or complete, and whether the tendon has retracted from the bone.
• Ultrasound may also be used as a quick, cost-effective way to evaluate the tendon.

Early diagnosis is important, as surgical repair yields the best outcomes when performed soon after injury.

Treatment depends on the severity of the tear, the patient’s age, activity level, and goals.

Nonsurgical management may be appropriate for partial tears, low-demand patients, or those unable to undergo surgery. It includes:

• Rest and activity modification to allow pain and swelling to subside.
• Physical therapy to restore motion, reduce stiffness, and strengthen surrounding muscles.
• Gradual return to light activity, avoiding heavy pushing or lifting.

However, surgical repair is the preferred treatment for most complete ruptures, especially in active individuals or athletes.

Pectoralis major tendon repair involves reattaching the torn tendon to the humerus using sutures and anchors through small incisions. Surgery aims to restore the muscle’s natural tension and contour, allowing for normal strength and appearance.

After surgery, the arm is typically protected in a sling for several weeks, followed by a gradual rehabilitation program focused on restoring range of motion, flexibility, and strength. Most patients can resume resistance training after 4–6 months, with near-complete return to pre-injury function.

While not all injuries can be avoided, proper training and conditioning can significantly reduce risk:

• Warm up thoroughly before heavy lifting.
• Use correct form, particularly during bench press—avoid lowering the bar too deeply or flaring the elbows.
• Increase weight gradually rather than making large jumps in load.
• Maintain balanced strength between chest, shoulder, and back muscles.
• Avoid performance-enhancing substances that can weaken tendons.

Listening to your body and stopping when you feel sharp pain or strain can prevent small tears from progressing to a full rupture.