- Subacromial bursitis
Infobox_Disease
Name = Subacromial bursitis
Caption =
DiseasesDB =
ICD10 = ICD10|M|75|5|m|70
ICD9 = ICD9|726.19
ICDO =
OMIM =
MedlinePlus =
eMedicineSubj =
eMedicineTopic =
MeshID =Subacromial bursitis is a condition caused by inflammation of the bursa that separates the superior surface of the supraspinatus tendon (one of the four tendons of the rotator cuff) from the overlying coraco-acromial ligament, acromion, coracoid ( the acromial arch) and from the deep surface of the deltoid muscle . The function of a healthy subacromial bursa is to facilitate the motion of the supraspinatus tendon of the rotator cuff in activities such as overhead work.
Musculoskeletal complaints are one of the most common reasons for primary care office visits, and rotator cuff disorders are the most common source of shoulder pain [cite journal |author=Arcuni SE |title=Rotator cuff pathology and subacromial impingement |journal=Nurse Pract |volume=25 |issue=5 |pages=58, 61, 65–6 passim |year=2000 |pmid=10826138 |doi= |url=] . According to the
American Academy of Orthopaedic Surgeons (AAOS) visits to orthopedic specialists for shoulder pain has been rising since 1998 and in 2005 over 13 million patients sought medical care for shoulder pain, of which only 34% were related to injury [ American Academy of Orthopaedic Surgeons Physician Visits for Musculoskeletal Symptoms http://www.aaos.org/Research/stats/Common%20Orthopaedic%20Symptoms%20Seen%20by%20a%20Physician.pdf ] .Primary inflammation of the subacromial bursa is relatively rare and may arise from autoimmune inflammatory conditions (rheumatoid arthritis), crystal deposition (Gout or Pseudo gout), calcific loose bodies (rheumatoid arthritis) and infectioncite journal |author=Salzman KL, Lillegard WA, Butcher JD |title=Upper extremity bursitis |journal=Am Fam Physician |volume=56 |issue=7 |pages=1797–806, 1811–2 |year=1997 |pmid=9371010 |doi= |url=] . More commonly, subacromial bursitis arises as a result of complex factors, thought to cause shoulder impingement symptoms. These factors are broadly classified as intrinsic (intratendinous) or extrinsic (extratendinous). They are further divided into primary or secondary causes of impingement. Secondary causes are thought to be part of another process such as shoulder instability or nerve injury (Bigliani and Levine, Journal Bone Joint Surgery 1997) cite journal |author=Bigliani LU, Levine WN |title=Subacromial impingement syndrome |journal=J Bone Joint Surg Am |volume=79 |issue=12 |pages=1854–68 |year=1997 |pmid=9409800 |doi= |url=http://www.ejbjs.org/cgi/pmidlookup?view=long&pmid=9409800] .
In 1983 Neer described three stages of impingement syndrome cite journal |author=Neer CS |title=Impingement lesions |journal=Clin. Orthop. Relat. Res. |volume= |issue=173 |pages=70–7 |year=1983 |pmid=6825348 |doi= |url=http://meta.wkhealth.com/pt/pt-core/template-journal/lwwgateway/media/landingpage.htm?issn=0009-921X&volume=173&spage=70] . He noted that "the symptoms and physical signs in all three stages of impingement are almost identical, including the `impingement sign'..., arc of pain, crepitus, and varying weakness." The Neer classification did not distinguish between partial-thickness and full-thickness rotator cuff tears in stage III . This has led to some controversy about the ability of physical examination tests to accurately diagnose between bursitis, impingement,impingement with or with out rotator cuff tear and impingement with partial versus complete tears.
In 2005, Park et al published their findings which concluded that a combination of clinical tests were more useful than a single physical examination test. For the diagnosis of impingement disease, the best combination of tests were “ any degree (of) a positive Hawkins-Kennedy impingement sign, a positive painful arc sign, and weakness in external rotation with the arm at the side,” to diagnose a full thickness rotator cuff tear, the best combination of tests, when all three are positive, were the: “the painful arc, the drop-arm sign, and weakness in external rotation” [cite journal |author=Park HB, Yokota A, Gill HS, El Rassi G, McFarland EG |title=Diagnostic accuracy of clinical tests for the different degrees of subacromial impingement syndrome |journal=J Bone Joint Surg Am |volume=87 |issue=7 |pages=1446–55 |year=2005 |pmid=15995110 |doi=10.2106/JBJS.D.02335 |url=http://www.ejbjs.org/cgi/pmidlookup?view=long&pmid=15995110] .
Natural history
The true natural history of subacromial bursitis may not be known. Patients with a single episode of shoulder pain from isolated bursitis may not seek medical care and may improve over time. Patients with bursitis commonly present for treatment with concomitant shoulder problems such as arthritis, rotator cuff tendinitis, rotator cuff tears, cervical radiculopathy (pinched nerve in neck) and since shoulder pain may arise from structures outside of the shoulder (jaw, neck, heart, gut) the true diagnosis may not be known initially.
In 1997 Morrison et al cite journal |author=Morrison DS, Frogameni AD, Woodworth P |title=Non-operative treatment of subacromial impingement syndrome |journal=J Bone Joint Surg Am |volume=79 |issue=5 |pages=732–7 |year=1997 |pmid=9160946 |doi= |url=http://www.ejbjs.org/cgi/pmidlookup?view=long&pmid=9160946] ., published a study that reviewed the cases of 616 patients (636 shoulders) with impingement syndrome (painful arc of motion) to assess the outcome of non-surgical care. An attempt was made to exclude patients who were suspected of having additional shoulder conditions such as, full-thickness tears of the rotator cuff, degenerative arthritis of the acromioclavicular joint, instability of the glenohumeral joint, or adhesive capsulitis. All patients were managed with anti-inflammatory medication and a specific, supervised physical-therapy regimen. The patients were followed up from six months to over six years. They found that 67% (413 patients) of the patients improved, while 28% did not improve and went to surgical treatment. 5% did not improve and declined further treatment and did undergo surgery.
Of the 413 patients who improved, 74 had a recurrence of symptoms during the observation period and their symptoms responded to rest or after resumption of the exercise program.
The Morrison study shows that the outcome of impingement symptoms varies with patient characteristics. Younger patients ( 20 years or less) and patients between 41 to 60 years of age, fared better than those who were in the 21 to 40 years age group. This may be related to the peak incidence of work, job requirements, sports and hobby related activities, that may place greater demands on the shoulder. However, patients who were older than sixty years of age had the “poorest results”. It is known that the rotator cuff and adjacent structures under go degenerative changes with ageing.
The authors were unable to posit an explanation for the observation of the bimodal distribution of satisfactory results with regard to age. They concluded that is was “unclear why (those) who were twenty-one to forty years old had less satisfactory results”. The poorer outcome for patients over 60 years old was thought to be potentially related to, “undiagnosed full-thickness tears of the rotator cuff” .
Pathophysiology
The literature on the pathophysiology of bursitis describes inflammation as the primary cause of symptoms. Inflammatory bursitis is usually the result of repetitive injury to the bursa.In the subacromial bursa, this generally occurs due to microtrauma to adjacent structures, particularly the supraspinatus tendon. The inflammatory process causes synovial cells to multiply, increasing collagen formation and fluid production within the bursa and reduction in the outside layer of lubrication (Ishii et al, 1997).
Less frequently observed causes of subacromial bursitis include hemorrhagic conditions, crystal deposition and infection. Many causes have been proposed in the medical literature for subacromial impingement syndrome. The bursa facilitates the motion of the rotator cuff beneath the arch, any disturbance of the relationship of the subacromial structures can lead to impingement. These factors can be broadly classified as intrinsic such as tendon degeneration, rotator cuff muscle weakness and over -use. Extrinsic factors include bone spurs from the acromion or A-C joint, shoulder instability and neurologic problems arising outside of the shoulder .
- The patient actively abducts the arm and a painful arc occurs between 800 and 1200. This is due to the compression of the supraspinatus tendon or subacromial bursa between the anterior acromial arch and humeral head. When lowering from full abduction there is often a painful “catch” at midrange. If the patient can achieve adequate muscle relaxation, passive motion tends to be less painful (Starr & Harbhajan, 2001).
- The patient performs an isometric flexion contraction against resistance of the therapist (Speed’s Test). When the therapist’s resistance is removed, a sudden jerking motion results and latent pain indicates a positive test for bursitis (Buschbacher & Braddom, 1994).
- Neer’s Sign: If pain occurs during forward elevation of the internally rotated arm above 900. This will identify impingement of the rotator cuff but is also sensitive for subacromial bursitis (Starr & Harbhajan, 2001).
- Reduce inflammation
- Reduce pain
- Prevent weakness and atrophy of muscles as a result of disuse
- Increase the patient’s awareness of bursitis
- Prevent/reduce impingement and further tissue damage
- Improve muscle control
- Improve scapulohumeral rhythm
- Improve active and passive range of motion
- Restore strength of scapular and rotator cuff muscles
- Return the patient to their previous level of function
- Achieve full active and passive range of motion
igns and symptoms
Subacromial bursitis often presents with a constellation of symptoms called
Pain along the front and side of the shoulder is the most common symptom and may cause weakness and stiffness . If the pain resolves and weakness persists other causes should be evaluated such as a tear of the rotator cuff or a neurological problem arising from the neck or entrapment of the suprascapular nerve. The onset of pain may be sudden or gradual and may or may not be related to trauma. Impingement may be brought on by sports activities, such as over head throwing sports, or over head work such as painting, carpentry or plumbing. Activities that involve repetitive over head activity, or directly in front,may cause shoulder pain. Direct upward pressure on the shoulder, such as leaning on an elbow may increase pain. Night time pain, especially sleeping on the affected shoulder, is often reported. Localized redness or swelling are less common and suggest an infected subacromial bursa. In patients who are less than forty years old, the diagnosis of impingement syndrome should be viewed with caution because these patients may have subtle glenohumeral instability [cite journal |author=Jobe FW, Kvitne RS, Giangarra CE |title=Shoulder pain in the overhand or throwing athlete. The relationship of anterior instability and rotator cuff impingement |journal=Orthop Rev |volume=18 |issue=9 |pages=963–75 |year=1989 |pmid=2797861 |doi= |url=] . Clinical tests: It is often difficult to distinguish between pain caused by bursitis or that caused by a rotator cuff injury as both exhibit similar pain patterns in the front or side of the shoulder (Hartley, 1990). Subacromial bursitis can be painful with resisted abduction due to the pinching of the bursa as the deltoid contracts (Buschbacher & Braddom, 1994).If the therapist performs a treatment direction test and gently applies joint traction or a caudal glide during abduction (MWM), the painful arc may reduce if the problem is bursitis or adhesive capsulitis (as this potentially increases the subacromial space). The following clinical tests, if positive, may indicate bursitis: It is interesting to note that an irritation or entrapment of the lower subscapular nerve, which innervates the subscapularis and teres major muscles, will produce muscle guarding at the shoulder that will restrict motion into external rotation, abduction, or flexion. The aforementioned tests will assist in diagnosing bursitis over other conditions (Hartley, 1990). X-ray and other imaging studies:X-rays may help visualize bone spurs, acromial anatomy and arthritis. MRI imagining can reveal fluid accumulation in the bursa and assess adjacent structures. Ultra sound studies are useful in identifying bursitis. pecial Considerations Patients with bursitis who have Many non-operative treatments have been advocated, including rest; oral administration of non-steroidal anti-inflammatory drugs; physical therapy; and local modalities such as cryotherapy, ultrasound, electromagnetic radiation, and subacromial injection of corticosteroids, . Blair et al, studied the effects of corticosteroid injections on patients with a mean eight month history of duration of symptoms and found that it was an effective short-term treatment for relief of impingement and was able to substantially decrease pain and increase motion cite journal |author=Blair B, Rokito AS, Cuomo F, Jarolem K, Zuckerman JD |title=Efficacy of injections of corticosteroids for subacromial impingement syndrome |journal=J Bone Joint Surg Am |volume=78 |issue=11 |pages=1685–9 |year=1996 |pmid=8934482 |doi= |url=http://www.ejbjs.org/cgi/pmidlookup?view=long&pmid=8934482] . Shoulder bursitis rarely requires surgical intervention and generally responds favourably to conservative treatment (Starr & Harbhajan, 2001). Surgery is reserved for patients who fail to respond to non-operative measures. Minimally invasive surgical procedures such as arthroscopic removal of the bursa allows for direct inspection of the shoulder structures and provides the opportunity for removal of bone spurs and repair of any rotator cuff tears that may be found. Early/ initial Initial phase of physiotherapy rehabilitation Goals of treatment Treatment Justification Advice and education Educate the patient about their condition and advise to avoid painful activities and the importance of relative rest of the shoulder Prevention of pain and impingement which delays the healing process Educate the patient about the importance of correct posture Puts muscles in the optimal length tension relationship, reducing impingement Manual therapy Grade 1 and 2 accessory mobilisations of the glenohumeral joint Has a neurophysiological affect reducing pain and improving synovial fluid flow, improving healing Soft tissue massage Lengthens tight muscles and reduces muscle spasm Therapeutic exercise Gentle pendulum range of motion exercises Maintenance of range of motion and prevention of adhesive capsulitis Scapular exercises such as shoulder shrugs and shoulder retraction exercises Improve muscular control and scapular coordination Centring of humeral head Helps to facilitate adequate muscle timing and recruitment Stretching of tight muscles such as the: Levator scapula, pectoralis major, subscapularis and upper trapezius To lengthen tight muscles which may improve scapulohumeral rhythm, posture and increase the subacromial space Rotator cuff strengthening – isometric contractions in neutral and 30 degrees abduction Improves rotator cuff strength which is integral to the stability of the shoulder and functional activities Electrophysical modalities Ice To reduce inflammation and pain Low intensity pulsed ultrasound (3Hz) To reduce inflammation and facilitate healing External physical aids May use head of humerus repositioning tape To maintain the head of humerus in its central position for optimal muscle recruitment Middle/ intermittent Intermittent phase of physiotherapy rehabilitation Goals of treatment Treatment Justification Advice and education Advise the patient that they must perform all activities and exercises pain free To prevent reinjury and damage to the bursa Manual therapy Grade 3 and 4 accessory mobilisations of the glenohumeral joint Improves range of motion and increases synovial fluid movement, improving healing Proprioceptive neuromuscular facilitation (PNF) in functional diagonal patterns Strengthens muscles, improves motor control and scapulohumeral rhythm Mobilisation with movement eg caudad glide with active abduction Improves range of motion and decreases pain Therapeutic exercise Specific muscle strengthening exercises especially for scapular depressors (serratus anterior, middle and lower trapezius muscles) eg strengthening lower trapezius muscle – bilateral external rotation using a theraband, strengthening of serratus anterior, punching with theraband resistance Increases the strength of the scapular depressors which may help to reduce impingement of the bursa by increasing the subacromial space, strengthening also prevents atrophy Active assisted range of motion - creeping the hand up the wall in abduction, scaption and flexion and door pulley manoeuvre Help to improve active range of motion and gravity assists with shoulder depression Active internal and external rotator exercises with the use of a bar or a theraband Improves strength of rotator cuff and improves mobility in internal and external rotation Electrophysical modalities Heat Improves muscle extensibility Low intensity pulsed ultrasound (3Hz) Facilitates healing External physical aids May use head of humerus repositioning tape if necessary To maintain the head of humerus in its optimal position for optimal muscle recruitment Late/ return to function Return to function phase of physiotherapy rehabilitation Goals of treatment Treatment Justification Education and advice Education about the importance of a home based exercise program in the late stage of rehabilitation Ensures patient compliance Correction of techniques performed Ensures that the correct target muscles are being used Education to ensure that the patient performs activities and exercises within pain free limits This reduces the chance that the patient may work too hard and cause reinjury Manual therapy PNF functional patterns with increasing resistance Continues to strengthens muscles, improves motor control and scapulohumeral rhythm Therapeutic exercise Exercises specific for the patient’s functional needs eg functional reaching To improve the patients functional ability Proprioception exercises eg Wall push ups with the hands resting on medicine balls or dura disks Improves proprioception important to reduce reinjury as return to function/sport Strengthen the shoulder elevators – deltoid, flexors and also lat dorsi. Important in this phase of the rehabilitation following strengthening of the shoulder depressors. Progress strengthening exercises to incorporate speed and load to make more functional Adding speed and load to exercises ensures that the patient is prepared for more functional tasks and activities Electrophysical modalities Ice after exercise May assist to reduce any inflammation post exercise External physical aids May use head of humerus repositioning tape if necessary May assist with return to function Anderson, D., M, (2000), Dorland’s Illustrated Medical Dictionary, 29th ed, W.B. Saunders Company, Canada, 965-967. Buschbacher, R., M, Braddom, R., L. (1994). Sports medicine & rehabilitation: A sport-specific approach. Hanley and Belfus Inc, Philadelphia. Hartley, A. (1990).Practical joint assessment: A sports medicine manual, St Louis, Sydney. 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References
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