What is the anatomy and function of the rotator cuff?
The rotator cuff consists of four muscles (namely the supraspinatus, infraspinatus, teres minor, and subscapularis) that act in concert to both stabilize and move the shoulder joint. Due to the function of these muscles, sports which involve a lot of shoulder rotation – for example, serving in tennis, pitching in baseball, swimming, kayaking – often put the rotator cuff muscles under a lot of stress.
These muscles arise from the shoulder blade and insert on the humeral head to create a continuous cuff around the shoulder joint, and provide a link from the trunk to the arm. The ball (humeral head) and its socket (glenoid) have relatively little inherent stability, and have often been compared to a golf ball resting on a golf tee. In this capacity, an intact rotator cuff is essential to provide stability to the joint by a compressing the humeral head into the concave glenoid. A large torn rotator cuff , particularly of the subscapularis, can render the joint at risk for instability and dislocation.
The deltoid and rotator cuff muscles work synergistically to maintain a balance of forces around the shoulder joint in every direction. The deltoid and infraspinatus/teres minor maintain a balance in the vertical plane, while the subscapularis and infraspinatus balance each other in the horizontal plane. With lifting of the arm, the deltoid generates an upward force that is resisted by the downward force produced by the rotator cuff muscles, preventing a loss of reduction of the humeral head on the glenoid. A torn rotator cuff can disrupt this balance of forces and compromise normal shoulder joint motion. In fact, a high riding humeral head that shifts superiorly off the glenoid with raising of the arm can be seen in the setting of a massive torn rotator cuff.
What is a torn rotator cuff?
A torn rotator cuff is a disruption in the integrity of the tendon at the insertion into the humeral head. Tendons connect the rotator cuff muscle belly to bone. Most commonly, tears involve the supraspinatus tendon but can involve any combination or all four of the rotator cuff tendons. The mechanism of injury can be highly variable. A torn rotator cuff can result from trauma such as a fall on the shoulder or after a shoulder dislocation. More commonly, however, athletes suffer a torn rotator cuff from repetitive wear and tear activities that strain and chronically fail the tendon. Such tears are particularly prevalent in overhead athletes and are often seen in tennis players, baseball pitches, javelin throwers, swimmers, and football quarterbacks. Sometimes, a narrow space for passage of tendon underneath the acromion can result in direct mechanical abrasion of the tendon. This has been termed outlet impingement and is commonly referred to as impingement syndrome. A prominent acromial spur and thickened bursal tissue in the subacromial space can abrade the tendon running underneath.
How does a torn rotator cuff occur in athletes?
Damage and ultimately tearing of the rotator cuff tendons has been attributed to either static or dynamic causes. Static changes refer to impingement and mechanical abrasion of the tendons from narrowing of the subacromial space, most commonly due to roughness or “spurring” on the underside of the acromion or thickening of the coracoacromial ligament. On the other hand, a torn rotator cuff can result from abnormal dynamic motion of the humeral head and cuff relative to scapula, leading to abnormal strain on the tendon and tearing on either the joint or bursal side. For example, muscle weakness can allow the humeral head to rise higher towards the acromion and is considered to be one of the most common dynamic causes of a torn rotator cuff in athletes.
A torn rotator cuff result when the muscles and tendons of the rotator cuff become frayed under the acromion bone of the shoulder. This occurs both with aging as well as in younger people who perform repetitive overhead activities. Baseball pitchers as well as occupations that require overhead work are two examples of people at risk of sustaining rotator cuff tears. Pedro Martinez and Randy Johnson are both examples of professional, hall-of-fame bound pitchers who developed a torn rotator cuff.
How is a torn rotator cuff classified?
Unfortunately, there is no universal classification system for a torn rotator cuff. They can be classified based on various characteristics, including thickness, size, pattern or degree of retraction. Commonly used terms to descriptively categorize rotator cuff tears include:
Partial vs. Full thickness Tears
L-shaped vs. U-shaped Tears
Small, Large, or Massive Tears (retracted <3cm, 3-5cm, or >5cm respectively
What is the natural history of rotator cuff tears in athletes?
Many patients with rotator cuff tears are asymptomatic. As many as 50% of people over the age of 60 years may have rotator cuff tears. Correspondingly, however, many patients with shoulder pain may not have a cuff tear. In addition, the presence of a rotator cuff tear in a patient with shoulder pain does not necessarily mean that the tear is the primary cause of pain. It is clear, however, that patients with asymptomatic tears are at a high risk for symptom progression over time.
Unfortunately, rotator cuff tears do not heal spontaneously. In addition, tear size progresses over time and can unfortunately lead to irreversible changes in the tendon and muscle. Retraction of the tendon, scar formation, and atrophy of the muscle with infiltration of fat are all predictable changes that occur with greater chronicity of tears. These changes not only produce a weak shoulder with abnormal mechanics, but also compromise the ability to perform a surgical repair of the tendon to bone. The condition can progress to the point where the relationship between the humeral head and glenoid is permanently altered, with significant upward migration of the head. Arthritis secondary to a massive rotator cuff tear can develop as the humeral head erodes the superior glenoid and undersurface of the acromion. For throwing athletes, fixing a rotator cuff tear is important for them to retain their velocity and control of the ball. Pedro Martinez was able to return to the major league level of baseball competition after a repair of his full-thickness tear.
Symptoms of Rotator cuff tears.
What Does a Torn Rotator Cuff Feel Like?
While rotator cuff tears may be asymptomatic, they will frequently manifest as shoulder pain, particularly at night and during activities of daily living. Patients may complain of varying degrees of shoulder weakness and variable losses of range of motion. Crepitus and swelling can occur as well. On physical exam, patients with longstanding tears may have visible atrophy of muscles around the scapula. Functional deficits often correlate with the location of the tear. Overhead activities are often the most difficult and painful.
Overhead athletes with rotator cuff tears may complain of stiffness and pain during warm-up exercises. Pain is often most prominent during the acceleration phase of throwing or serving. Pitchers will often complain of a loss of velocity or ability to “control their pitch” at the mound.
Rotator cuff tears and MRI. Are imaging studies useful?
Plain x-rays can be useful to examine the relationship between the humeral head and glenoid. Also, they can demonstrate a narrow outlet or downsloping acromion that may put the rotator cuff at increased risk for mechanical abrasion. Magnetic resonance imaging (MRI) and ultrasound are the most common imaging modalities used to diagnose rotator cuff pathology. Ultrasound (US) certainly has a role in the diagnostic evaluation of cuff pathology. While the specificity and sensitivity of US is highly operator dependent, the test is dynamic and permits evaluation of the shoulder with during provocative maneuvers that reproduce symptoms. MRI is more than 95% sensitive in diagnosing rotator cuff tears and can accurately be used to estimate tear size, retraction, and fatty infiltration. This has important clinical implications, as the amount of fatty infiltration can help to prognosticate the success of a surgical repair.
What are my treatment options?
Treatment options for rotator cuff tears can be broadly categorized as nonsurgical or surgical interventions.
Nonsurgical options offer the advantage of avoiding the complications of surgery, and focus on pain relief and improving function by increasing the compensatory role of surrounding muscles. On the other hand, nonsurgical treatment will not result in healing of the torn tendon. Correspondingly, the risk of recurrent symptoms as well as tear progression with irreversible, chronic changes is substantial.
Surgical repair offers the potential benefit of expeditious pain relief and cessates tear progression and secondary chronic changes. Improvements in surgical techniques allow the vast majority of rotator cuff tears to be addressed arthroscopically through minimally invasive techniques. Nonetheless, small risk of infection and stiffness after surgery exist.What are the nonsurgical modalities available for a torn rotator cuff?
Initially, sports injury treatment using the P.R.I.C.E. principle - Protection, Rest, Icing, Compression, Elevation can be applied to a torn rotator cuff.Rotator cuff exercises for rehabilitation:
Exercise is the most important and useful intervention in the nonoperative management of a torn rotator cuff. Initially, athletes should rest and avoid any provocative maneuvers that elicit discomfort. When the pain has resolved, stretching can begin. The initial focus is on obtaining full and painless range-of-motion.
When full and painless range-of-motion have been gradually achieved, strengthening of the intact rotator cuff muscles and associated peri-scapular musculature can ensue. Strengthening of the rhomboids, levator scapulae, trapezius, and deltoid is of tantamount importance to provide a stable platform to maximize the efficiency and function of the remaining, intact cuff tissue. Some useful rotator cuff exercises to focus on these muscles include:
Latissimus pull downs
Local steroid injections in the subacromial space can function as potent anti-inflammatory agents in the subacromial bursa. They are very effective in relieving night pain and can also be used as an augment to rehabilitation exercises in patients that otherwise cannot comply secondary to discomfort. Steroids can have adverse effects on the quality of tendon tissue and healing, however, and for this reason should not be performed more than 3 times in the same shoulder and no more frequently than at least 3 months apart.
Nonsteroidal Anti-inflammatory Drugs (NSAIDS):
NSAIDs help to both control inflammation and relieve pain, and can be very useful as an adjunct to rehabilitation exercises in the management of a torn rotator cuff. These medications can have significant gastrointestinal and renal side effects, however, and should be carefully monitored by a medical physician.
Iontophoresis and Phonophoresis:
These are both techniques used to delivery medications locally through the skin, and can be useful to provide shoulder analgesia as an augment to rehabilitation exercises. Iontophoresis uses electrical current delivery, while phonophoresis uses ultrasound.
What does surgery involve for a torn rotator cuff?
Several factors influence the decision to pursue surgical treatment, including tear size and pattern, patient expectations, medical comorbidities, and occupational demands. Surgery for rotator cuff tears may be performed as an open, mini-open, or entirely arthroscopic procedure.
Partial-thickness tears usually involve the supraspinatus and/or infraspinatus and can be located on the articular or bursal surfaces of the tendon. Articular-sided tears on the side of the joint are about twice as common as bursal-sided tears. There is increasing evidence to suggest that partial-thickness tears, particularly those that are ignored or left untreated, progress to larger, full-thickness tears.
Partial-thickness tears are common in overhead athletes who perform repetitive activities, such as tennis, baseball, swilling, or cricket. Athletes will have pain and stiffness with warm-up exercises, and are often uncomfortable during the acceleration phase of throwing. They may demonstrate mild weakness with resisted elevation and/or external rotation of the arm, and will complain of a loss of velocity and control with pitching.
Currently, most surgeons decide of the treatment strategy for partial-thickness tears based on the depth of the lesions. If the tendon tear is less than 50% its thickness, the tear is typically debrided. If the tear is high-grade and involves greater than 50% of the tendon thickness, the tear is often completed and repaired down to bone. If the tear is on the bursal-side, a subacromial decompression and acromioplasty (shaving of the acromion) is also important to increase space for the tendon and avoid future injury.
Symptomatic full-thickness tears can be approached with arthroscopic or open surgical techniques to repair the tendon back to bone.
Regardless of which technique is performed, the first step of the procedure involves carefully exposing and visualizing the tear to determine its pattern and configuration. This involves performing a thorough resection of the overlying subacromial bursa until the bursal side of the cuff tissue is clearly visualized. The bursa can often be thick and inflamed, and may provide indication of mechanical impingement. An acromial spur or downsloping anterolateral acromion can certainly compromise visualization and contribute to mechanical injury of the tendon. In this setting, an acromioplasty (shaving of the acromion) to increase the clearance for the cuff and improve visualization should be performed. Bony prominences (or osteophytes) related to osteoarthritis of the acromioclavicular joint may also be encountered, and these should be resected as well to improve clearance for the rotator cuff tendons.
After careful inspection of the tear, a repair strategy should be developed to approximate the tendon to bone. If the tear is chronic, mobilization of the tendons may be necessary by releasing adhesions and scar tissue. Without this step, the retracted tendon may not be repairable to bone.
The tendons are typically repaired to bone using suture anchors that are placed in the humeral head at the site of detachment. These are metallic or biocompatible composite screws loaded with on or two sutures. The sutures are passed through the tendon, pulled down, and tied to the bone. The number and position of anchors required depends on the size and configuration of the tear. Sometimes side-to-side sutures can be placed between tendon edges if a tear within the tendon is present as well.
After the tear is anatomically repaired to bone, the surgeon must also evaluate all other lesions within and around the shoulder that may be a source of pain as well. This will include an inspection of structures within the joint such as the glenoid labrum and long head of the biceps tendon. In addition, the acromioclavicular joint and distal clavicle can be a source of pain and may require a resection as well.
What are the advantages of arthroscopic surgery over a conventional open procedure?
Arthroscopic surgery has become the technique of choice for rotator cuff surgery. It offers several advantages, including:
1- Small skin incisions
2- The ability to visualize and inspect the inside of the shoulder (glenohumeral joint) at the time of surgery, and treat other potential pain-generating lesions. This is not possible with conventional open procedures.
3- Avoid splitting and potential detachment of the deltoid muscle.
4- Ability to visualize and treat partial-thickness tears on the articular (joint) side.
5- Less soft tissue dissection.
6- Less postoperative pain.
7- Expeditious rehabilitation program.
Subacromial decompression, acromioplasty, debridement of partial-thickness tears, and repair of full-thickness tears can all be performed using arthroscopic techniques. Tears of the subscapularis tendon, however, can be challenging using the arthroscopic technique and may require an open procedure to fully visualize and repair.
What is involved in postoperative rehabilitation?
In the postoperative period, the arm must be protected. The forces related to daily activities with the shoulder exceed the strength of the repair and can disrupt it until some healing has occurred. A postoperative brace maintains the arm in approximately 15 degrees of abduction and prevents any overhead activity. Ice packs or custom devices that circulate cooled fluid are very useful to control pain and swelling in the immediate postoperative period.
As pain resolves, early passive range-of-motion is initiated within the first week of surgery. A physical therapist can be a very useful adjunct to this process in order to maintain a safe, supervised program. Gentle pendulum exercises in the sling, as well as passive motions in forward flexion and external rotation are continued for the first six weeks.
Rotator Cuff Exercises: Stretching & Strengthening Strengthening exercises are typically delayed until 8 to 12 weeks when healing has progressed and full range-of-motion has been achieved. Start strengthening exercises only after you have your health professional's approval. Muscle strengthening with rubber tubing can be very effective and often safer than weight machines. Strengthening of the scapular stabilizers (deltoid, trapezius, rhomboids, levator scapulae, etc) is paramount to the strengthening of the rotator cuff to maintain a stable platform and favorable posture for cuff mechanics. Patients continue strengthening for up to a year or longer until satisfactory strength and function are achieved. The degree of strength achieved often relates with the severity and chronicity of the initial tear.
Rehab after rotator cuff surgery can vary widely, but there are some general principles that are true for most patient having surgery for treatment of a torn rotator cuff. Usually these rotator cuff exercises are started gradually as soon as you can do the exercise routine without pain.The list below provides links to specific rehab video exercises:
● 2 - 4 weeks: Torn Rotator Cuff, Beginning Exercises
● 2 - 4 weeks: Torn Rotator Cuff Recovery Exercise, The Pendulum
● 4 - 6 weeks: Torn Rotator Cuff Stretch - Internal Rotator
● 4 - 6 weeks: Torn Rotator Cuff Stretch - External Rotator
● 6 - 8 weeks: Torn Rotator Cuff, Pulley Exercises
● 8 weeks: Torn Rotator Cuff Recovery Exercise, Bench & Reach
● 8 weeks: Torn Rotator Cuff Recovery Exercise, External Rotation
● 8 - 10 weeks: Torn Rotator Cuff Recovery Exercise, Lat Pull-Downs
How long will it take for me to get back to my sport?
Just like all tears are not created equal, neither is the rehabilitation and recovery. Unfortunately, these timelines need to be individualized based on the severity of the tear and demands of your sport. Tennis, baseball, and other overhand sports can be very demanding, particularly at high-levels of competition. With these sports, a gradual return to activity is planned with your doctor. After healing has occurred, this is usually initiated through a graduated and supervised throwing program in which distance and velocity is slowly increased as tolerated over 2 to 3 months. Small or partial thickness tears will generally permit an accelerated recovery compared to large tears, but the ultimate plan to get you back on the field or court must be determined by your doctor and should reflect a balance of moving forward expeditiously without placing the repair at undue risk.
Can I prevent a torn rotator cuff? Rotator cuff Exercises.
The etiology of rotator cuff tears is multifactorial, and it is unclear with current evidence if tears can be completely prevented. Maintaining the health of the rotator cuff muscles and peri-scapular musculature, however, can certainly help to prevent injury and optimize the kinematics of the shoulder joint. These strategies are employed by elite pitchers and overhead athletes who place remarkable demands on their shoulder and rotator cuff daily. The internal rotators are inherently stronger than the external rotator cuff muscles, and maintain a balance of these forces is important. Rotator cuff exercises to consider include:
Latissimus pull downs
Resisted tubing exercises
Side-lying external rotator
Propped external rotator
Shoulder blade squeeze