Common Orthopaedic Shoulder Diagnoses Encountered in the Primary Care Setting

William Wardell, DO | william.wardell@guthrie.org

INTRODUCTION

Shoulder pain and shoulder pathology are common chief complaints in the primary care setting. The shoulder consists of multiple joints, mainly the glenohumeral joint. The other joints that are considered in the shoulder include the acromioclavicular, sternoclavicular, and scapulothoracic joints. Each joint has associated pathology and should be considered in the workup of shoulder pain. Most common pathologies, and the majority of those further discussed, involve the glenohumeral joint. The glenohumeral joint is a ball-and-socket joint formed between the humeral head and the glenoid of the scapula. The joint exhibits significant freedom of motion in all planes, including flexion, extension, abduction, adduction, internal rotation, and external rotation. Motion also exists at the scapulothoracic joint, which also may present with pathology. The glenohumeral joint is stabilized both dynamically and statically. The major dynamic forces include the musculature of the shoulder, most importantly the rotator cuff musculature and biceps brachii, which comprise a large subset of pathology discussed in this article. This complex joint provides multiple areas for pathology to arise.

Shoulder pain and shoulder disorders are commonly seen in the primary care setting. While many of these disorders can be managed by the primary care physician, some may pose a diagnostic dilemma. This article will review 10 common shoulder disorders, evaluating when conservative management is appropriate and when referral to a specialist is warranted.

Subacromial impingement syndrome

Subacromial impingement syndrome is believed to be a three- phase progression. Stage 1 involves younger patients (less than 25 years old) and is characterized by acute bursitis with subacromial edema and inflammation. Stage 2 is more common in patients 25–40 years of age and is mostly characterized by rotator cuff tendonitis and/or fraying of the anterior fibers of the supraspinatus. Stage 3 is characterized by partial- or full-thickness tearing of the rotator cuff.4

At presentation, the patient may complain of shoulder pain exacerbated by overhead activity. Exacerbation of symptoms is common with elevation greater than 90°. Pain may also worsen at night.5 A thorough history and physical exam are important, as many conditions can mimic impingement syndrome. A comprehensive physical exam should include range of motion, strength, and special testing. Special testing includes Neer and Hawkins tests, which are sensitive but not specific for impingement syndrome.6 During the Neer test, the examiner passively flexes the patient’s shoulder with the arm internally rotated; reproduction of pain is a positive exam. With the Hawkins test, which is performed at 90° of shoulder and elbow flexion, the examiner exerts an internal rotation force on the shoulder. If pain is reproduced with internal rotation of the shoulder, this is a positive Hawkins test. Calcific tendonitis is a common cause of active therapy failure, and there are multiple surgical options available for treatment. A lidocaine challenge injection, which involves injecting 5–10 mL of 1% or 2% lidocaine without epinephrine to the subacromial space, can support a diagnosis of impingement syndrome but is not frequently performed in clinical practice. Full pain relief upon reexamination postinjection supports a diagnosis of impingement syndrome.

The majority of patients with subacromial impingement syndrome improve with conservative treatments. Nonsurgical treatment typically includes home exercises, physical therapy (PT), and subacromial cortisone injections. Osteopathic manipulative treatment (OMT) may also be performed to help mobilize the ribs, stabilize the scapula (to prevent dyskinesis), and treat restrictions at the AC joint.7 Studies have found that two-thirds of patients experience significant improvement with conservative management.8 If the patient fails conservative treatment, they may be a candidate for orthopedic surgical intervention.

Surgical treatment options include open or arthroscopic subacromial decompression. Arthroscopic subacromial decompression is associated with decreased recovery and less pain in the immediate postoperative period. Shoulder motion should be assessed and documented diligently. Differential diagnosis should include frozen shoulder, rotator cuff pathology, and glenohumeral arthritis. Although a finding of global decrease in both passive and active range of motion is highly suspicious for frozen shoulder, these findings must be consistent to determine whether or not treatment is successful. The physician should record both passive and active range of motion. Passive motion should be evaluated with the patient supine to restrict scapulothoracic movement. Passive flexion, external rotation in abduction (arm away from the patient’s body), external rotation and internal rotation in adduction (arm at the patient’s side), and cross-chest adduction should be measured. Magnetic resonance imaging (MRI) findings may demonstrate thickening of the joint capsule and the coracohumeral ligament; however, frozen shoulder is a clinical diagnosis. An MRI is also useful for eliminating other sources of shoulder pain.

Frozen shoulder

Frozen shoulder tends to resolve with nonsurgical treatment, but resolution may take as long as one to three years. For primary frozen shoulder, defined as insidious onset without inciting event, a supervised PT program is successful in the majority of patients. Secondary frozen shoulder, defined as the diminished global range of motion of the shoulder secondary to shoulder injury or surgery, does not have the same success rate with formal PT alone. Typically, 6 weeks of formal PT is recommended for both subsets of patients. If the patient continues to make progress, an additional 6 weeks of PT, followed by a home exercise program, is reasonable. Techniques using OMT can be applied to the upper thoracic area, upper ribs, and entire shoulder complex to improve motion. For example, Spencer techniques can be utilized to challenge the range of motion barriers in multiple planes of motion. In conjunction with formal PT, other conservative measures should be exhausted in patient treatment, including nonsteroidal anti-inflammatory drugs (NSAIDs), corticosteroid injections, and glenohumeral lidocaine injections.11 In the freezing phase, where pain is the largest concern, corticosteroid injection and oral medications are most successful.11 In the frozen phase, where restricted range of motion is most prevalent, formal PT is best used.11 If, after 12 to 16 weeks, there is no improvement or worsening of symptoms, surgical intervention may be considered.

Surgical management includes manipulation under anesthesia (MUA). MUA is often performed in combination with an arthroscopic capsular release. A formal course of PT, typically for 6 weeks, is essential postoperatively to maintain range of motion and improve shoulder strength

FIGURE 1:

Anteroposterior radiograph of the glenohumeral joint (I) and axillary (II) radiograph of the shoulder demonstrate glenohumeral osteoarthrosis with joint space narrowing and inferior spur formation (red arrow) of the humeral head.

In a patient diagnosed with biceps tendonitis, first-line treatment is conservative. This often includes NSAIDs, activity modification, PT, and corticosteroid injections. Corticosteroid injection can be administered to the bicipital sheath and should not be directly injected into the tendon. If a patient fails nonoperative management, referral to an orthopedic surgeon for further evaluation is recommended, as biceps tenodesis or tenotomy can be performed for refractory cases.

There are four stages of calcific tendonitis. The precalcific stage is usually pain free and includes fibrocartilaginous transformation within the rotator cuff tendon. The formative stage is the stage in which calcium is deposited in the rotator cuff tendon. This stage may or may not be painful. During the resting phase, the calcium deposition is terminated and there is no inflammation or vascular infiltration. Similarly, this phase may or may not be painful. The resorptive phase is considered the most debilitating for patients. Calcium crystals may extravasate into the subacromial bursa, which is a process commonly associated with severe pain and loss of range of shoulder motion. This phase can last for up to 2 weeks.

Physical examination findings are similar to subacromial impingement syndrome. Pain is worse at night and limited range of motion with overhead activities may be present. Imaging is necessary to distinguish between calcific tendinosis and other sources of shoulder pain. Plain radiographic imaging is usually diagnostic for calcific tendonitis (Figure 2). Other modalities such as ultrasound and MRI are not usually required for diagnosis but assist in evaluating for other associated pathology.

Calcific tendinosis is, in general, self-limited. Treatment is usually supportive with NSAIDs, acetaminophen, steroid injections, and PT. Steroid injections tend to be particularly effective in the acute setting.16,17 If calcific tendonitis fails to respond to conservative treatment, referral to an orthopedic specialist is recommended, as a patient may be a candidate for arthroscopic calcific debridement.

FIGURE 2:

Anteroposterior (I) and scapular Y (II) radiographs of the shoulder demonstrate calcific tendonitis (arrow).

Patients with rotator cuff tears may present with progressive weakness, worsened with overhead motion of the affected arm. Patients who sustained an acute traumatic tear may present with acute pain and weakness of the affected arm or pseudoparalysis. In addition, night pain is commonly associated with rotator cuff tears. A thorough physical exam should be performed on all patients, and all four rotator cuff muscles should be tested individually with muscle strength testing and associated special tests. Supraspinatus primarily functions in abduction of the shoulder and is best tested with resisted abduction. The drop arm test and the Jobe test (also known as the empty can test) are two special tests to evaluate the supraspinatus. Infraspinatus and teres minor both function to externally rotate the shoulder. Infraspinatus is best examined by testing muscle strength in external rotation at 0° of abduction, while the teres minor is best tested in external rotation at 90° of abduction. The teres minor can be examined with the Hornblower’s test, in which the patient’s arm is abducted to 90° with the elbow flexed to 90°. The patient is then asked to externally rotate the arm to 90° against resistance. If the arm drops back to a neutral position, the test is positive. The subscapularis functions to internally rotate the shoulder and is best tested with resisted internal rotation at 0° of abduction. Special tests for the subscapularis include the belly press, bear hug, or lift-off sign.

In addition to physical examination, imaging also plays an important role in the diagnosis and management of rotator cuff tears. Plain radiographs are useful in assessing associated calcific deposits in the tendons or ligaments or to evaluate for superior migration of the proximal humerus. Superior migration is a sign of long-standing rotator cuff arthropathy. Because MRI is the gold standard for diagnoses of rotator cuff injuries, it should be ordered when there is a high clinical suspicion (Figure 3). Ultrasound can also be useful in providing static or dynamic examination.

Treatment of rotator cuff tears consists of nonoperative management and operative management. The conservative approach is typically first-line treatment for most tears, especially partial tears. A crucial component of conservative measures is PT, with focus on regaining lost range of motion, followed by rotator cuff strengthening and scapular stabilization. Administration of NSAIDs and subacromial corticosteroid injections can be useful in symptom management. Indications for surgery and referral to orthopedics include acute full-thickness tears, pseudoparalysis, massive rotator cuff tears, and tears greater than 50% that have failed conservative treatment. Open or arthroscopic rotator cuff repair can be performed.

 

FIGURE 3:

MRI T2-weighted coronal sequence of the shoulder demonstrates a full- thickness supraspinatus tear with retraction.

Patient presentation and physical exam are important steps in the diagnosis of proximal humerus fractures. Physical exam findings include pain and swelling of the shoulder and upper arm, with decreased range of motion of the shoulder. It is always important to perform a thorough neurovascular exam as concomitant injury can occur to the axillary nerve. It may not be possible to assess motor function in the acute setting due to pain. Sensory testing of the lateral shoulder should be performed. In addition to the physical exam, diagnosis of a proximal humerus fracture requires radiographic imaging. A true AP or Grashey view, a scapular Y view, and axillary views should be obtained. Additional studies, including computed tomography (CT), may be useful for preoperative planning, especially if there is concern for intra- articular comminution or there is an unclear view of the fracture fragments on plain radiographs, but are not necessary in the primary care setting.

Management of proximal humerus fractures is based on the fracture pattern and extent of displacement. The Neer classification is used to classify proximal humerus fractures. This classification system is based on the anatomy of the potential fracture segments.29 The four potential segments include the greater tuberosity, lesser tuberosity, humeral head, and humeral shaft. The distinction of a part or segment is important to the system. A fracture fragment is classified as a distinct part or segment if it is displaced greater than one centimeter or if there is more than 45° of angulation.

Most fractures of the proximal humerus can be treated conservatively. Indications for a nonsurgical treatment include a minimally displaced surgical or anatomical neck fracture, or greater tuberosity fractures with less than 5-mL displacement.30 Nonoperative management consists of sling immobilization followed by PT for rehabilitation.30

Displaced fractures should be referred to an orthopedic surgeon for consideration of surgical intervention. There are various operative fixation methods, including open reduction with internal fixation, percutaneous fixation, intramedullary nailing, and arthroplasty.

CONCLUSION

The 10 shoulder disorders reviewed in this article represent some of the most common shoulder diagnoses encountered in the primary care setting but is not all inclusive. Knowledge of these disorders is important because most of them can be managed without referral to a subspecialist. It is also imperative to identify when referral to a specialist is warranted.

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