Pectoralis Major Rupture
Updated: Apr 8
Over the last two decades, the popularity of fitness and strength sports has increased dramatically. Bench press, powerlifting, and high-intensity resistance training are now part of the weekly routines of millions of people, not just professional athletes. However, this development has also had a significant consequence for sports medicine: some muscle and tendon injuries that were previously quite rare are being reported increasingly frequently.
Before continuing, it's important to state that it's incorrect to say that weight training alone causes muscle and tendon tears. The vast majority of these injuries are related to using weights above physiological limits (ego lifting), incorrect form, and the use of anabolic steroids ( anabolic steroids increase muscle strength but may not increase tendon endurance at the same rate ). Therefore, training with proper form and weights appropriate to the individual's physiology is highly unlikely to lead to these types of injuries.
One of these injuries is a pectoralis major muscle tear . The pectoralis major is one of the largest and strongest muscles of the anterior chest wall and plays a critical role in movements such as adduction , internal rotation , and, in certain situations, raising the arm forward. When the tendon of this muscle tears, not only does pain occur; it can also lead to a significant decrease in arm strength, noticeable deformity in the chest area, and significant losses in athletic performance.
Historically, pectoralis major tears were considered quite rare. One of the first medical descriptions was made in 1822, reporting that this injury usually occurred in people who performed heavy physical work. Throughout the 20th century, only a limited number of case reports were included in the literature. However, the situation has changed with the rise of modern sports culture. Today, the majority of these injuries occur during sports activities, and especially during weight training .
The most important reason for this change is that exercises that intensely activate the pectoralis major muscle, especially pushing exercises like bench press , are performed under high loads. During these movements performed with heavy weights, the tension placed on the muscle and tendon can lead to a tear at the point where the tendon attaches to the bone or at the muscle-tendon junction when a certain threshold is exceeded.
Interestingly, this injury often occurs unexpectedly. Even strong and well-trained athletes can experience a sudden "tearing" sensation in the chest area during a single repetition. Therefore, pectoralis major tendon injuries are frequently considered one of the characteristic injuries of high-performance athletes in the sports medicine literature.
This article will examine the anatomy of the pectoralis major muscle, starting with its cause and effect, the symptoms experienced by athletes, and how modern orthopedic surgery treats these injuries, all in a scientific yet understandable way.
ANATOMY OF THE PECTORALIS MAJOR
The pectoralis major muscle is one of the largest and most functionally important muscles of the anterior chest wall. Although it is known primarily as the "chest muscle" for aesthetic reasons, biomechanically it is one of the fundamental muscle groups that enables powerful movements of the shoulder joint. It plays a critical role, particularly in movements such as adduction (pulling the arm towards the torso) , internal rotation (rotating it inwards) , and flexion (raising it forward in certain positions ) .
GENERAL STRUCTURE OF THE MUSCLE
The pectoralis major is a large, fan-shaped muscle located along the anterior chest wall. Anatomically, its muscle fibers originate from different points in the chest region and converge towards the shoulder blade to form a single strong tendon.
The starting points of the muscles are as follows:
Clavicle (collarbone)
Sternum (breastbone)
Cartilage portions of the ribs (ribs 1–6)
Aponeurosis of the external oblique muscle
Thanks to its large base area, the pectoralis major muscle can generate a very strong pulling force. All these muscle fibers then converge laterally and attach to a region of the humerus bone called the intertubercular groove (bicipital groove) .
TWO PARTS
The pectoralis major is anatomically composed of two main parts:
1. Clavicular Head: This section originates from the medial portion of the collarbone. It plays a major role in raising the arm forward and shoulder flexion.
2. Sternocostal Head: Originating from the sternum and ribs, this section forms the largest part of the muscle. It is particularly active in pulling the arm towards the torso and in strong pushing movements.
A critical point regarding sports injuries is this: the vast majority of pectoralis major tears occur in the sternocostal head . This is because this section is subjected to much greater tension under heavy loads.
FUNCTIONAL IMPORTANCE
The main functions of the pectoralis major muscle are as follows:
Internal rotation of the humerus
Adduction of the humerus
Shoulder flexion with arm behind the back.
All of these movements are heavily utilized, particularly in pushing exercises such as bench press, dips, and push-ups . Therefore, in individuals involved in strength sports, the pectoralis major muscle is constantly under high mechanical stress.
This is precisely why, under certain conditions, even this powerful muscle can suffer a sudden and dramatic tendon rupture .
WHY DOES THE PECTORALIS MAJOR MUSCLE TEAR?
The pectoralis major muscle is one of the strongest muscle groups in the human body. However, the high force it produces also places significant mechanical stress on the tendon. Especially during resistance exercises with heavy weights, when a certain biomechanical combination occurs, a sudden tear can happen at the point where the tendon attaches to the bone.
Understanding this injury first requires understanding how the muscle works and which movements place the most stress on the tendon.
Eccentric contraction and stress on the tendon.
Muscles work in two main ways:
Concentric contraction: The muscle generates force as it shortens.
Eccentric contraction: The muscle generates force as it lengthens.
During eccentric muscle contraction, muscle fibers both stretch and bear load. Therefore, the stress on the tendon-muscle junction can be much higher.
Pectoralis major tears most often occur during eccentric loading . Specifically, excessive tension is placed on the tendon as the muscle lengthens while controlling a heavy load.
Bench Press
Most pectoralis major tendon tears occur during bench press exercises . This is because this movement places the muscle in its most anatomically disadvantageous position.
As the bar is lowered towards the chest, the arm takes the following position:
in shoulder abduction position
arm in external rotation
muscle elongates eccentrically
This position stretches the sternocostal fibers to their maximum extent. If the weight is too high or the muscle experiences a sudden change in load, a tear can occur at the point where the tendon attaches to the bone.
THE MOST COMMONLY TORN AREA
Pectoralis major tears most commonly occur in the following areas:
The point where the tendon attaches to the humerus (tendo-osseous junction)
Muscle-tendon junction
Studies indicate that approximately 65% of cases occur at the point where the tendon attaches to the bone , and approximately 27% occur at the muscle-tendon junction.
These areas are the anatomical regions where the tendon is subjected to the greatest mechanical stress.
TYPICAL MECHANISM OF INJURIES
Pectoralis major tears typically occur with the following scenario:
During a bench press, the athlete lowers the bar to their chest.
The muscle stretches eccentrically.
The weight creates more stress than is controlled.
The muscle suddenly attempts to contract concentrically.
During this transition, a sudden force is applied to the tendon, and a tear occurs.
Therefore, in the literature, this injury is often described as "eccentric overload injury" .
RISK FACTORS
Not everyone who bench presses experiences this injury. However, certain factors significantly increase the risk:
High weight usage: Exceeding the maximum force the tendon can withstand.
Steroid use: Anabolic steroids increase muscle strength but may not increase tendon endurance to the same extent.
Insufficient warm-up: Cold tendon tissue is more fragile.
Repetitive microtrauma: Prolonged high-volume training can lead to weakening of tendon tissue.
Sudden force change: Spotter intervention or uncontrolled bar movement.
WHO IS MORE LIKELY TO GET IT?
Pectoralis major tears most commonly occur in the following groups:
Male athletes aged 20–40
individuals who do weight training
People involved in powerlifting or bodybuilding
These individuals typically describe a sudden tearing sensation and a "pop" sound in the chest area at the time of the injury . This is often followed by pain, bruising, and weakness.
SYMPTOMS OF PECTORALIS MAJOR TEAR
Pectoralis major tendon ruptures typically occur dramatically. Most athletes remember the moment of the injury very clearly. This is due to the distinct symptoms that result from the sudden tearing of the tendon tissue.
The classic scenario described in the literature is quite characteristic and is often described similarly by athletes.
MOMENT OF INJURY: "SOMETHING BROKE OFF IN MY CHEST!"
Most patients who experience a pectoralis major tear describe the following experience:
a sudden tearing sensation in the chest area
an audible or perceptible "pop" sound
sharp pain that follows immediately
These symptoms often appear during the lower phase of a heavy bench press repetition. Immediately after the injury, the athlete is usually unable to continue the exercise.
FIRST HOURS
Several typical signs develop in the hours following the injury:
Pain: Marked pain occurs in the front of the chest wall and around the shoulder.
Swelling: Inflammation develops in the soft tissues surrounding the muscles and tendons.
Bruising (ecchymosis): Bruising may occur due to bleeding, especially in the armpit and upper arm areas. This bruising sometimes becomes more pronounced within a few days and can spread over a larger area.
POWER LOSS
There is a significant loss of strength in the primary functions of the pectoralis major muscle, namely adduction (pulling the arm towards the trunk) and internal rotation (rotating the arm inwards).
Therefore, athletes often notice the following:
weight significantly reduces thrust
sudden drop in bench press performance
difficulty performing some movements
VISIBLE DEFORMITY
Depending on the severity of the tear, a noticeable deformity may develop in the chest area.
The most common findings are:
disappearance of the anterior axillary fold
pulling the pectoral muscle towards the medial side
asymmetry in the chest muscle
Normally, there is a distinct muscle fold in the front of the armpit formed by the pectoralis major muscle. When the tendon tears, this structure can disappear, and the chest contour can change.
CHEST ASYMMETRY
Some patients also experience the following visual changes:
prominent asymmetrical appearance on the chest wall
nipple displacement downwards
medial pull in the chest muscle
These deformities become particularly noticeable when the muscles contract or the arm is pulled towards the torso.
PECTORLIS MAJOR INDEX(PMI): CLINICAL EXAMINATION
In recent years, a simple clinical test has been developed to evaluate pectoralis major tears: the Pectoralis Major Index (PMI) .
In this test, the patient is evaluated in the following position:
arms 90° abduction
shoulders 90° external rotation
elbows flexed at 90°
This position is called the "military press position." In this position, the distance between the areola and the most prominent crease of the pectoralis major muscle is measured, and the two sides are compared.
If the distance between the injured and healthy sides is significantly shorter, a PMI < 0.9 is a strong diagnostic finding for a pectoralis major tear.
This method is particularly important for early diagnosis because delayed diagnosis can make surgical treatment more difficult .
DIAGNOSIS
Pectoralis major tendon tears are often injuries strongly suspected through clinical examination . For an experienced orthopedist, the patient's injury history and physical examination findings are quite helpful in making a diagnosis. However, imaging methods are of great importance in making a definitive diagnosis and determining the exact location of the tear.
Accurate diagnosis is crucial not only for confirming the injury but also for planning the most appropriate treatment.
CLINICAL EVALUATION
The diagnostic process usually begins with taking a detailed history of the patient. Patients with pectoralis major tears often describe a fairly typical event:
a sudden tearing sensation during a heavy bench press repetition
sharp pain in the chest area
loss of power that followed immediately
During a physical examination, the doctor will evaluate the following findings:
chest muscle deformity
anterior axillary fold loss
decrease in adduction and internal rotation force
bruising and swelling
These findings often raise strong clinical suspicion. However, imaging is necessary for a definitive diagnosis.
X-RAY
Radiography is often performed during the initial assessment. X-ray images do not directly show muscle or tendon tears. Instead, they are used to rule out certain conditions:
shoulder dislocation (glenohumeral dislocation)
humerus fractures
rare bone avulsions
This can be seen on a radiograph, especially if a small piece of bone has broken off at the point where the pectoralis major tendon attaches to the bone.
ultrasound
Ultrasound can be used as a quick and economical imaging method in some cases. When performed by an experienced radiologist, it can show tendon tears.
Findings that may be seen on ultrasound:
irregularities in muscle fibers
disruption of tendon integrity
hematoma formation
tendon retraction
However, ultrasound has a significant limitation: the results depend heavily on the operator.
Therefore, a sonographer with a good knowledge of anatomy and experience in sports injuries is necessary.
Gold standard: MR imaging
MRI is the most reliable imaging method for evaluating pectoralis major tears . This is because MRI can show soft tissues in extremely high detail.
The following information can be obtained with MRI:
the exact location of the tear
Degree of tear (partial or complete)
amount of tendon retraction
presence of hematoma or bleeding
edema in muscle tissue
Therefore, in the literature, MR imaging is considered the "gold standard" for diagnosing pectoralis major tendon ruptures .
In MRI scans, T2-weighted images are particularly valuable in evaluating acute injuries. In these images, edema and bleeding appear as high signal intensity, and the location of the tear can be clearly identified.
THE IMPORTANCE OF EARLY DIAGNOSIS
Early diagnosis is crucial in pectoralis major tendon ruptures, as surgical treatment is generally much more successful when performed within the first 8 weeks .
If an injury remains untreated for a long time, the following problems may arise:
tendon retraction
fibrosis in muscle tissue
scar tissue formation
surgical repair becomes more difficult
Therefore, it is important for athletes to receive an early orthopedic evaluation if they experience sudden tearing sensations, bruising, or loss of strength in the chest area.
TREATMENT: SURGERY OR CONSERVATIVE APPROACH?
The treatment approach for pectoralis major tendon tears depends on three main factors:
Degree of tear (partial or complete)
localization of the tear
patient's activity level
Therefore, the same treatment is not applied to every patient. However, there is a general consensus in modern sports medicine literature: complete tendon tears in young and active individuals are mostly treated surgically. This is because surgical repair yields more successful results in restoring muscle strength and function.
Several different surgical techniques can be used to reattach the pectoralis major tendon to the humerus. The most commonly used methods are:
Transosseous suture (TOS): In this method, small holes are made in the humerus bone, and the tendon is fixed to the bone with strong sutures passed through these holes. It is a classic and reliable technique that has been used for many years.
Suture anchor technique: In this method, small anchor implants are placed in the bone. The tendon is attached to these anchors and fixed in its anatomical position.
Cortical button fixation: This is a more modern technique. The tendon is firmly fixed to the bone using special button systems.
Biomechanical studies show that these techniques generally have similar durability. Therefore, the surgeon's preferred method often depends on clinical experience and the characteristics of the tear.
WHEN IS SURGERY NOT NECESSARY?
Not every pectoralis major tear requires surgery. Some patients may find non-surgical treatment sufficient.
Conservative treatment is generally preferred in the following situations:
elderly patients
low level of physical activity
partial tendon tears
patients unsuitable for surgery
In this approach, the treatment process generally proceeds as follows:
First stage: short-term immobilization with arm sling.
Second stage: pain and inflammation control.
Third stage: physical therapy and muscle strength recovery.
However, there is an important point here. Studies show that in patients treated without surgery, in most cases:
decrease in shoulder adduction force
loss of maximum muscle strength
difficulty in high-performance activities
This shows that it can be seen.
Therefore, surgical treatment is more frequently preferred, especially in athletes and active individuals .
WHY IS SURGICAL REPAIR MORE EFFECTIVE?
The goal of surgical treatment for complete tendon tears is quite simple: to anatomically reattach the torn tendon to the humerus bone. This procedure allows the muscle's normal biomechanics to be restored.
The advantages of surgical treatment, as demonstrated in the literature, are as follows:
better muscle strength recovery
preserving the contour of the chest muscles
shortening the recovery period
higher patient satisfaction.
Therefore, surgical repair often yields the best results, especially in individuals who participate in high-strength sports such as bench press .
POST-OPERATIVE RECOVERY
Rehabilitation after surgical repair is crucial. Typically, the following steps are followed:
First 4–6 weeks: The arm is supported with a sling, and strenuous activities are avoided.
6–12 weeks: Controlled range of motion exercises and light strengthening begin.
3–6 months: Muscle strength is gradually regained, and a return to sports activities is planned.
With appropriate treatment and rehabilitation, many patients can achieve a satisfactory recovery in terms of strength and function .
CONCLUSION
Pectoralis major tendon ruptures were considered relatively rare injuries for many years. However, with the rise of modern fitness culture and high-intensity resistance training, these injuries have become increasingly common. Particularly during high-load pushing exercises like bench press, the pectoralis major muscle is subjected to significant mechanical stress, and under certain conditions, tendon ruptures can occur.
This injury usually manifests dramatically: the athlete experiences a sudden tearing sensation, pain, and loss of strength. Early diagnosis is crucial at this point, because timely assessment and appropriate imaging methods can determine the location and severity of the injury and allow for the development of the most suitable treatment plan.
Although the treatment approach varies from patient to patient, in modern sports medicine, surgical repair often provides the best functional results, especially in active individuals and athletes . Through anatomical repair, the muscle's natural biomechanics can be restored, and many patients can return to high levels of physical activity with an appropriate rehabilitation program.
Perhaps the most important lesson to be learned about this injury is that as muscle strength increases, so does the stress on the tendons. Therefore, athletic performance is improved not only by lifting more weight, but also by understanding the correct biomechanics, progressive loading, and tissue adaptation .
Understanding the muscular system is essential not only for improving performance but also for maintaining it. This is precisely the goal of modern sports science: not to push the limits of the human body, but to understand how those limits work.
References:
Long MK, Ward T, DiVella M, Enders T, Ruotolo C. Injuries of the Pectoralis Major: Diagnosis and Management. Orthop Rev (Pavia). 2022 Nov 30;14(4):36984. doi: 10.52965/001c.36984. PMID: 36589511; PMCID: PMC9797018.
ElMaraghy AW, Rehsia SS, Pennings AL. Utility of the Pectoralis Major Index in the Diagnosis of Structurally Significant Pectoralis Major Tears. Orthop J Sports Med. 2013 Dec 16;1(7):2325967113516729. doi: 10.1177/2325967113516729. PMID: 26535260; PMCID: PMC4555516.
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