The rotator cuff (RC) is an anatomic coalescence of the muscle bellies and tendons of the supraspinatus (SS), infraspinatus (IS), teres minor (TM), and subscapularis (SubSc). Rotator cuff syndrome (RCS) constitutes a spectrum of disease across a wide range of pathologies associated with injury or degenerative conditions affecting the rotator cuff (RC).
RCS includes subacromial impingement syndrome (SIS) and bursitis, RC tendonitis, partial- versus full-thickness RC tears (PTTs versus FTTs), and, chronically, can influence the development of glenohumeral degenerative disease (DJD) and rotator cuff arthropathy (RCA).
In order to best understand the clinical association of these conditions, one must first appreciate the constellation of symptoms implied by each clinical diagnosis and its associated terminology.
One must also appreciate the historical and evolving theories behind the etiology and pathophysiology of the RCS clinical spectrum:
Extrinsic Compressive theories
Historically, the popular theory for the etiology of RCS cited extrinsic compression factors as the primary source for the onset of the pathophysiologic cycle. Extrinsic factors consist of anatomic entities that cause direct injury to the cuff. Historically, Watson-Jones described the pathologic abutment of the lateral acromion on the RC during mid-arc shoulder abduction. Neer later popularized and modified the theory of degenerative acromial spurring and advocated for the clinical importance of the anterior aspect of the acromion as the predominant source of impingement. Neer's classic report in 1972 suggested that 95% of RC tears occurred secondary to the aforementioned mechanical site of impingement. In addition to the anterior spurring, the coracoacromial ligament (CAL) can become calcified in chronic SIS and can serve as another source of extrinsic compression on the cuff. Bigliani later highlighted the importance of acromial morphology, especially the hooked-type acromion, in the predisposition of patients developing SIS. Several studies later documented an association between the hooked-type acromial morphology and the presence of impingement symptoms and full-thickness RC tears. Other possible anatomical causes include AC joint degenerative changes. subacromial spurs  and in much rarer instances, symptomatic os acromiale.
After Neer's proposal regarding the prevalence of extrinsic compressive sources as the primary driving force causing injury to the RC, a decade later he coined promote his theories linking RC injury, extrinsic compression, and subacromial impingement syndrome (SIS). SIS implies extrinsic compression secondary to a narrowing of the subacromial space. As knowledge of extrinsic compression has evolved, a particular subset of patients exhibiting a variation in RC pathology was becoming documented in the literature with increasing incidence rate recognition. Internal impingement occurs secondary to the pathologic abutment of the articular side of the RC, between the posterior/superior glenoid rim and greater tuberosity of the humerus with the arm in maximum shoulder abduction, external rotation, and extension. In effect, the theory behind internal impingement provided an important distinction with respect to external compressive forces and a narrowed subacromial space, as these patients did not demonstrate a pathologically narrowed acromiohumeral interval.
Intrinsic degenerative theories
Intrinsic degenerative RC theories advocate for another set of etiological factors as the primary source of pathology leading to the clinical presentation of patient-reported symptoms. Although the opposing theories existed as early as the 1930s, with Codman and Akerson proposing intrinsic tendon degeneration of the RC, more extensive evidence began to surface as multiple reports in the 1990s demonstrated increasing evidence to support increasing degenerative RC changes seen in association with increasing patient age.
In general, the intrinsic degenerative theories cite the that cuff degeneration eventually compromises the overall stability of the glenohumeral joint. With the dynamic stability compromised, the humeral head migrates superiorly, and the subacromial space decreases in size. Thus, the cuff becomes susceptible to secondary extrinsic compressive forces which ultimately leads to cuff degeneration and tearing:
Several studies have identified regions of hypovascularity in the RC tendons which may lead to attritional degeneration of the cuff. Lohr et al. initially demonstrated a distal area of the SS tendon on the articular side that lacks blood vessel supply in a cadaveric study. Rudzki et al. demonstrated an age-dependent manner of increasing degrees of hypovascularity in this tendinous region as well. However, controversy proposed by other studies supports that the attritional areas develop secondary to the preceding impingement mechanisms. Subsequently, EI/SIS leads to blood vessel damage, ensuing ischemia, tenocyte apoptosis and gross tendinopathy, and attritional cuff damage. Furthermore, many studies cite increased vascularity in focal areas of the cuff, and the hypervascularity has been associated with age-related changes, tendinopathy, and PTTs and/or FTTs.
Age, sex, and genetics
Histologically, age-related RC changes include collagen fiber disorientation and myxoid degeneration. The literature favors increasing frequencies of RC abnormalities with increasing age. The frequency of RC abnormalities increases from 5% to 10% in patients’ younger than 20 years of age to 30% to 35% in those in their sixth and seventh decades of life and tops out at 60% to 65% in patients’ over 80 years of age.
A study by Budoff et al. proposed that the primary mode of failure of the cuff occurs as a result of eccentric tension repeatedly imposed on the RC.
RCS also can be seen in association with glenohumeral instability, PTTs and RC fatigue over time (especially with overhead overuse), and posterior capsular contractures. The subacromial bursa degenerates and eventually loses its physiologic protective potential for the cuff. As a consequence of the degenerative process, the bursa serves as another source of mechanical compression.
Sports and occupation
Various social and environmental factors predispose patients to developing RCS over time. Occupational mechanical risk factors include manual laborer positions requiring significant heavy lifting, constant overhead working requirements, and repetitive work activities in general. Miranda et al. reported a 20-year follow-up study of a cohort of workers in Finland that demonstrated the synergistic effect of multiple occupational mechanical risk factors in the development of RCS and/or shoulder pain. Pertinent factors included occupational force requirements, the posture of the shoulder during the actual work, and overhead activity requirements. As alluded to earlier, overhead activities in sports such as throwing also predispose patients to the development of RCS.
Multiple studies in the literature have supported a dose- and a time-dependent association between smoking and RC tears. A 2010 study investigated 586 subjects with unilateral shoulder pain, noting almost two-thirds of the RC tear subgroup having a documented current or history of smoking. Other studies have suggested a correlation between smoking and RC degeneration, symptomatic cuff tears, and even the increase in the size of the cuff tear when present.
Multiple medical conditions play a potential role in the development and exacerbation of RCS. Metabolic syndrome and its associated diagnoses (i.e., dyslipidemia, hypertension, hyperglycemia, and abdominal obesity) have known associations with RC pathology. The individual medical conditions of metabolic syndrome itself, in addition to thyroid disorders, diabetes, and inflammatory arthritides, are considered additional risk factors for RCS.
Contemporary etiologies for RC pathology
We now appreciate that most RC tears occur in the anterior half of the supraspinatus tendon, typically initiating about 1cm from its insertional footprint on the greater tuberosity. This area has been termed the "anterior critical zone" . This critical zone of hypovascularity has been attributed to our contemporary knowledge and appreciation that the majority of RC tears originate at the articular side .
The prevalence of rotator cuff syndrome (RCS) and its associated pathologies affects millions of patients on a global scale. Shoulder pain accounts for approximately 4.5 million office visits and about $3 billion in healthcare costs in the United States alone. RCS afflicts patient populations in an age-dependent fashion, from 5% to 10% of patients younger than 20 years of age to over 60% in patients over age 80 years. Overall, chronic shoulder pain in the adult population has a 67% lifetime prevalence rate. SIS is considered the most common cause of acute and chronic shoulder pain. The literature supports an equal incidence of RCS and RC tears when comparing male and female populations.
The extrinsic compressive theory of SIS supports the inciting factors leading to SIS to be anatomic and/or mechanical in nature. These structures result in increased pressures and pathologic contact, leading to a susceptible and tendinopathic cuff. Extrinsic mechanisms include:
The intrinsic theory of SIS cites the predisposition for a weakened cuff which degenerates over time. Age, hand-dominance, vascular changes, and repetitive eccentric forces cause the cuff to weaken over time, compromising the dynamic stability of the shoulder. Consequently, the humeral head migrates proximally and decreases the acromiohumeral interval, predisposing the cuff to further injury and degeneration. Intrinsic mechanisms include:
Clinicians evaluating patients with acute or chronic shoulder pain should obtain a comprehensive history. Characteristics of rotator cuff syndrome (RCS) include
A thorough history includes current or history of sports participation (as well as specific positions played in each sport), occupational history and current status of employment, hand dominance, any history of injury/trauma to the shoulder(s) and/or neck, and any relevant surgical history.
Physical Examination Pearls
C-spine / neck exam:
Co-existing cervical radiculopathy should be ruled out in any situation where neck and/or shoulder pathology is in consideration. Observation of neck posturing, muscular symmetry, palpable tenderness, and active/passive ROM should be evaluated. Special tests that are helpful in this regard include the Spurling maneuver, myelopathic testing, reflex testing, and a comprehensive neurovascular exam.
Clinicians must observe the overall shoulder girdle for assessment of symmetry, shoulder posturing, and overall muscle bulk and symmetry. Scapular winging should also be ruled out. The skin should be observed for the presence of any previous surgical incisions, lacerations, scars, erythema, or induration.
After the observational component of the physical examination, the active and passive ROM are documented. In cases of RCS, patients may demonstrate compromised active ROM but should normally exhibit full passive ROM. In the absence of advanced degenerative changes affecting the glenohumeral joint, limited passive ROM is considered diagnostic for adhesive capsulitis and involves a separate treatment algorithm from RCS/impingement.
The clinician can assess motor strength grading for C5 to T1 nerve roots in addition to specific RC muscle strength testing. Specifically, RC strength and/or pathology can be assessed via the following examinations:
Teres Minor (TM)
Radiographic imaging should be obtained in all patients with acute or chronic shoulder pain.
Recommended imaging includes a true anteroposterior (AP) image of the glenohumeral joint (i.e., the “Grashey” view). The true AP image is taken with the patient rotated between 30 and 45 degrees offset the cassette in the coronal plane. Alternatively, the beam can be rotated while the patient remains neutral in the coronal plane. The distance between the acromion and the humeral head (i.e., the acromiohumeral interval) can be calculated. A normal interval is between 7 and 14 mm, and this interval is decreased in cases of advanced degenerative arthritis and RCA.
Other radiographic imaging includes a 30-degree caudal tilt view that can be performed to visualize the presence of acromial spurring. In addition, the “scapular Y” or “supraspinatus outlet” view is used to determine acromial morphology.
The most common radiographic changes associated with EI/SIS and RCS include:
Ultrasound (US) is an often-underutilized imaging modality to detect RC tendon and muscle belly integrity. In 2011, a meta-analysis of over 6,000 shoulders revealed a sensitivity of 0.96 and specificity of 0.93 in assessing shoulders for partial- or full-thickness cuff tears. Another study highlighted the potential inability to differentiate between partial- and full-thickness cuff tears (PTT versus FTT) measuring about 1 cm in size.
Magnetic Resonance Imaging
Magnetic Resonance Imaging (MRI) is useful in evaluating the overall degree of RC pathology. MRI can be helpful in providing more accurate cuff tear details, including partial- versus full-thickness tears, the extent and size of the tear(s), location, and the degree of retraction. In cases of chronic RC pathology, the cuff can be assessed for fatty degenerative changes on the T1-weighted sagittal sequence series.
Subdeltoid and/or subacromial bursitis can also be evident and are important considerations as potential sources of pain. In addition, the acromioclavicular (AC) joint, acromial morphology, and long head of the biceps (LHB) tendon integrity are better appreciated. A systematic approach to reviewing shoulder MRIs is important, especially when correlating the MRI findings with the patient reported symptoms and clinical examination.
Given the complex nature of rotator cuff syndrome (RCS), we recommend the treatment and management be broken down into the following categories:
Group 1: Partial-Thickness (PTTs) or Full-Thickness RC Tears (FTTs), Asymptomatic Patient
Patients presenting with MRI-evidence of PTTs or FTTs often present without any symptoms. The most recent American Academy of Orthopaedic Surgeons (AAOS) clinical practice guideline (CPG) summary reported the growing awareness of incidental RC pathology revealed via shoulder MRIs in asymptomatic patient populations. Although there is evidence of increasing prevalence of RC disease in the aging population, there is no reliable evidence that surgical intervention prevents tear propagation or the development of clinical symptoms. Thus, the committee recommended symptomatic management via nonoperative modalities alone.
Patients presenting with symptoms of EI/SIS in the absence of FTTs are first managed with nonoperative treatment modalities. There is no agreed upon time interval that is most appropriate to proceed with surgical intervention in this particular group of patients. The literature ranges from 3 months to 18 months. Surgical intervention should be individually tailored based on the patient’s symptoms, improvement with nonoperative modalities, and overall goals.
Group 3: Chronic RC Tears, Symptomatic Patients 
The AAOS CPG reported a “weak” recommendation grade secondary to limited available evidence in the literature comparing rotator cuff repair (RCR) to continued nonoperative treatment modalities in this subset of patients. Certainly, the overall clinical picture must be considered, and the treatment tailored to the individual patient in each scenario.
Physical therapy (PT)
RCS surgical techniques range from debridement, subacromial decompression (SAD), and/or acromioplasty to RC debridement and, when indicated, RC bursal- or articular-sided tear completion with RCR. The latter will not be discussed in this review. Assuming no RC FTTs are present, the extent of surgical management for external impingement/SIS alone includes :
The differential diagnosis for chronic shoulder pain includes several etiologies:
AC joint conditions
The majority of patients with rotator cuff syndrome (RCS) in the absence of FTTs improve with nonoperative management. The most recent AAOS CPG touted a “moderate” recommendation grade for initial treatment of NSAIDs and/or exercises programs based on multiple level II studies in the literature.
In 2013, The MOON shoulder group provided insight into the management and outcomes of atraumatic, FTT of the RC. In a cohort of almost 500 patients, nonoperative treatment resulted in 75% reporting positive patient-reported outcomes at 2-year followup. In addition, the patients electing to undergo surgery (25%) typically decided to do so between 6- and 12-weeks following the initial onset of symptoms.
Complications associated with rotator cuff syndrome (RCS) are best broken down into nonoperative- versus operative-related complications:
Following SAD/acromioplasty (without RCR), patients are kept in a sling for 1 to 2 weeks with early passive ROM rehabilitation parameters. Clinicians should recognize the risk of overutilization of sling immobilization, especially when soft tissue repair protocols do not have to be respected.
Initially, patients are instructed to avoid heavy lifting and exercises to facilitate soft tissue healing. Cryotherapy devices are often applied for the first 10 to 14 days postoperatively. Physical therapy is often started postoperatively once the sling is discontinued.
Full active ROM should be achieved by 3 to 6 weeks maximum. If applicable, return to sport-specific skills at 6 to 8 weeks as tolerated.
Primary care medical doctors can manage the majority of cases of rotator cuff syndrome (RCS), especially along the nonoperative management spectrum. After these modalities are exhausted, an appropriate referral can be made to an orthopedic surgeon. While the nonoperative management is not conclusively managed with a supervised physical therapy protocol, a supervised protocol is recommended in the postoperative setting to regain maximum ROM and full strength.
Patients should be educated about the nature of the condition as well as the possibility of continued chronic pain following surgical management for persistent impingement/rotator cuff syndrome (RCS) symptoms.
Rotator cuff syndrome (RCS) is a clinical entity consisting of a wide range of clinical symptoms, ranging in severity from mild shoulder impingement, but eventually in the long-term setting, can lead to progressive partial thickness cuff tears (PTTs) and/or full-thickness cuff tears (FTTs). When clinicians are working up acute or chronic shoulder pain, it is imperative to correlate the clinical examination with radiographic imaging, MRI, and response to nonoperative treatment modalities. The latter consists of physical therapy, NSAIDs, rest/activity modification, and injections. Surgical management is considered after impingement symptoms fail to resolve, or worsen, after all other management modalities are exhausted. Referral to an orthopedic surgeon should be considered, especially with long-standing persistent symptoms.
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