Injuries of the pectoralis major muscle are rare. Although the injury typically occurs while lifting weights, specifically while performing a bench press, it has also been known to occur in several other sports. Several factors, including delay in care and recognition of the injury, can delay appropriate treatment and result in worse outcomes for the patient. Specific treatment of this injury depends on the severity of the injury, the patient’s activity level, and daily living needs.
A pectoralis major lesion occurs when there is tearing of the pectoralis major muscle due to excessive tension on a maximally eccentrically contracted muscle or, less commonly, as a result of direct trauma.
The injury most commonly occurs in young, physically active males in the third and fourth decades of life. It is often associated with weight lifting (particularly bench press), although there are reports of the injury during various other activities, such as martial arts, gymnastics, and football. It also has correlated with anabolic steroid use.
The pectoralis major is a broad, fan-shaped muscle that covers the upper anterior portion of the chest. The innervation corresponds to the lateral (C5-C7) and medial (C8-T1) pectoral nerves. It is composed of two parts: a sternal head and a clavicular head. The origin of the sternal head is the sternum and the six superior costal cartilages. The origin of the clavicular head is the medial half of the clavicle. The insertion of both is within an anterior and posterior layer at the lateral lip of the bicipital groove of the humerus. The action of the muscle is adduction, forward elevation, and internal rotation.
Traumatic injury of the pectoralis major most commonly occurs due to excessive tension on a maximally eccentrically contracted muscle. This setup typically occurs during the downward portion of a bench press, with the arm in the final 30 degrees of humeral extension and external rotation while pushing against heavy resistance. The most common types of injuries of the pectoralis major muscle are tendon avulsions at the site of insertion by this mechanism. Less common are myotendinous junction tears due to direct trauma.
The patient history should denote the mechanism of injury, as most patients recall the specific incident that led to the injury. Patients will usually report a tearing sensation or a “pop,” accompanied by a painful limitation of motion, as well as localized swelling, asymmetry, and ecchymosis. Delayed presentations often result from patients initially treating the injury at home as a typical sprain or strain rather than seeking medical care.
The physical examination may demonstrate swelling and ecchymosis over the anterior chest wall, axilla, and arm. Further inspection may reveal an asymmetric medial prominence of the muscle belly or a thinned-out, webbed appearance of the anterior axilla. Palpation may elicit tenderness over the insertion along the axillary fold, which may itself be thinned, hollowed, or completely lost. This finding can be accentuated by abducting the arm to 90 degrees. Strength and range-of-motion testing may reveal the limitation of shoulder motion due to pain and weakness in adduction and internal rotation of the arm.
Plain radiographs are of limited utility in diagnosing a pectoralis major tear but should be performed to assess for other pathology or associated abnormalities, such as bony avulsion injuries that occur in 2% to 5% of cases.
Ultrasound can be useful due to its relatively low cost and rapid availability. Tears are often identifiable by uneven echogenicity and muscle tearing in comparison with the contralateral side. The utility of ultrasound for this application, however, remains somewhat controversial, with some authors contending that the false-negative rate is unacceptably high.
Magnetic resonance imaging (MRI) is considered the imaging modality of choice and can help differentiate between acute or chronic complete or partial tears. MRI can be used to assess the grade and site of injury and correlates well with surgical findings.
Tietjen, in 1980, developed a system for classifying the location and severity of the injury. Tietjen denoted type I injuries as those consisting of muscle contusions and tears, type II as partial tears, and type III as complete tears. The latter category is further subdivided by location as follows: A) sternoclavicular origin; B) muscle belly; C) myotendinous junction; D) insertion.
The treatment of a pectoralis major tear depends on the severity of the injury and the anticipated use of the injured muscle based on the activity level of the patient (e.g., an athlete involved in competitive sports versus a sedentary individual performing activities of daily living). The treatment of choice for complete tears is generally operative. Initial non-operative treatment involves rest, ice, analgesia, and immobilization in a sling with the arm adducted and internally rotated. Passive and active range of motion exercises should begin within the first two weeks of recovery, gradually increasing to a full range of motion over the next six weeks. Progressive resistance exercises can begin at six to eight weeks from the date of injury, gradually increasing until full resistance training can resume at three to four months post-injury.
The differential diagnosis includes:
The prognosis of pectoralis major tears is generally good, especially if a prompt diagnosis is made and appropriate treatment is administered. Several studies have compared operative and non-operative management and concluded that operative management generally results in better functional recovery, including peak torque and work performance.
Complications of non-operative management
Complications of operative management
Presentation to a healthcare provider often gets delayed as patients treat the injury like a typical strain or sprain. A pectoralis major tear can be more difficult to detect after the initial pain and swelling have subsided. Persistent weakness and asymmetry after the resolution of the initial symptoms usually suggest a more severe injury. In contrast, an acute pectoralis major tear may be more challenging to detect due to swelling, an intact fascial covering, or the overlying and uninjured clavicular head obstructing a palpable or visible defect.
Pectoralis major tears are rare injuries, and there may be a delay in the presentation to the emergency department or primary care provider. To improve the morbidity of the disorder, an interprofessional team approach is a recommendation. Healthcare practitioners should order an MRI if a pectoralis major tear is suspected. The patient should obtain a referral to a sports physician, orthopedic surgeon, or rehabilitation specialist. Early diagnosis and treatment are important as chronic injuries may lead to more technically difficult surgery and suboptimal outcomes. The pain may need to be managed by the practitioner. Patients need to be educated on the adverse effects of analgesics and should opt for non-pharmacological measures like ice, massage, and acupressure. For those who are young, active, and want a faster recovery, referral to an orthopedic surgeon is the proper course. The recovery after conservative treatment is often long; after surgery, the recovery is faster, but there is always the risk of complications. Irrespective of the approach, the patient should be encouraged to seek physical therapy. The outcomes in most patients are good. Orthopedic specialty-trained nurses can assist with either surgical or conservative care, and act as a bridge between physical therapists and rehabilitation specialists and the surgeon. All members of the interprofessional healthcare team must communicate and have access to the same level of information regarding the case to drive optimal patient outcomes.[Level V]
|||ElMaraghy AW,Devereaux MW, A systematic review and comprehensive classification of pectoralis major tears. Journal of shoulder and elbow surgery. 2012 Mar; [PubMed PMID: 21831661]|
|||Wolfe SW,Wickiewicz TL,Cavanaugh JT, Ruptures of the pectoralis major muscle. An anatomic and clinical analysis. The American journal of sports medicine. 1992 Sep-Oct; [PubMed PMID: 1443329]|
|||de Castro Pochini A,Andreoli CV,Belangero PS,Figueiredo EA,Terra BB,Cohen C,Andrade Mdos S,Cohen M,Ejnisman B, Clinical considerations for the surgical treatment of pectoralis major muscle ruptures based on 60 cases: a prospective study and literature review. The American journal of sports medicine. 2014 Jan; [PubMed PMID: 24192390]|
|||Haley CA,Zacchilli MA, Pectoralis major injuries: evaluation and treatment. Clinics in sports medicine. 2014 Oct; [PubMed PMID: 25280620]|
|||Petilon J,Carr DR,Sekiya JK,Unger DV, Pectoralis major muscle injuries: evaluation and management. The Journal of the American Academy of Orthopaedic Surgeons. 2005 Jan-Feb; [PubMed PMID: 15712983]|
|||Bak K,Cameron EA,Henderson IJ, Rupture of the pectoralis major: a meta-analysis of 112 cases. Knee surgery, sports traumatology, arthroscopy : official journal of the ESSKA. 2000; [PubMed PMID: 10795675]|
|||Lee SJ,Jacobson JA,Kim SM,Fessell D,Jiang Y,Girish G,Magerkurth O, Distal pectoralis major tears: sonographic characterization and potential diagnostic pitfalls. Journal of ultrasound in medicine : official journal of the American Institute of Ultrasound in Medicine. 2013 Dec; [PubMed PMID: 24277888]|
|||Connell DA,Potter HG,Sherman MF,Wickiewicz TL, Injuries of the pectoralis major muscle: evaluation with MR imaging. Radiology. 1999 Mar; [PubMed PMID: 10207482]|
|||Carrino JA,Chandnanni VP,Mitchell DB,Choi-Chinn K,DeBerardino TM,Miller MD, Pectoralis major muscle and tendon tears: diagnosis and grading using magnetic resonance imaging. Skeletal radiology. 2000 Jun; [PubMed PMID: 10929411]|
|||Tietjen R, Closed injuries of the pectoralis major muscle. The Journal of trauma. 1980 Mar; [PubMed PMID: 7359604]|
|||Provencher MT,Handfield K,Boniquit NT,Reiff SN,Sekiya JK,Romeo AA, Injuries to the pectoralis major muscle: diagnosis and management. The American journal of sports medicine. 2010 Aug; [PubMed PMID: 20675652]|
|||Zeman SC,Rosenfeld RT,Lipscomb PR, Tears of the pectoralis major muscle. The American journal of sports medicine. 1979 Nov-Dec; [PubMed PMID: 507270]|
|||Kircher J,Ziskoven C,Patzer T,Zaps D,Bittersohl B,Krauspe R, Surgical and nonsurgical treatment of total rupture of the pectoralis major muscle in athletes: update and critical appraisal. Open access journal of sports medicine. 2010 Oct 11; [PubMed PMID: 24198558]|
|||Schepsis AA,Grafe MW,Jones HP,Lemos MJ, Rupture of the pectoralis major muscle. Outcome after repair of acute and chronic injuries. The American journal of sports medicine. 2000 Jan-Feb; [PubMed PMID: 10653537]|
|||Aärimaa V,Rantanen J,Heikkilä J,Helttula I,Orava S, Rupture of the pectoralis major muscle. The American journal of sports medicine. 2004 Jul-Aug; [PubMed PMID: 15262651]|