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Degenerative Rotator Cuff Tears

N. D. Clement, J. M. McBirnie
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The earliest published description of a rotator cuff tear was by Alexander Munro in 1788, when he described a “hole with ragged edges in the capsular ligament of the humerus”.1 Since this description there has been little agreement amongst orthopaedic surgeons regarding the exact indications for surgical repair of a torn rotator cuff.2 This review describes the epidemiology and management of degenerative rotator cuff tears.

 

Epidemiology

The prevalence of rotator cuff disease increases with age, with 4% of asymptomatic patients aged < 40 years and 54% of patients aged ≥ 60 years, having partial or complete tears of the rotator cuff on a MRI scan.3 Ultrasound scanning has demonstrated that 13% of the population in the fifth decade, 20% in the sixth decade and 31% in the seventh decade of life have a rotator cuff tear.4 Yamaguchi et al5 demonstrated that more than half of asymptomatic rotator cuff tears become symptomatic within 3 years and progressed in size during this time period.

 

The Natural History of a Rotator Cuff Tear

Neer6 originally described three stages of rotator cuff disease.6 Stage I occurring in patients < 25 years with oedema and hemorrhage of the tendon and bursa. Stage II involves tendinitis and fibrosis of the rotator cuff in patients aged between 25 and 40 years of age. Stage III involves tearing of the rotator cuff, either partial or full-thickness, and occurs in patients > 40 years of age. Whether the pathological changes observed in the rotator cuff is secondary to intrinsic tendon degeneration and/or extrinsic mechanical impingement is a matter of debate. Yamanaka and Matsumoto7 demonstrated that 10% of partial-thickness tears heal and 10% become smaller, but 53% of tears will propagate and 28% progress to full-thickness tears. Full-thickness rotator cuff tears do not heal spontaneously, and may progress with time.5,8,9 This is thought to be due to poor vascularisation within the rotator cuff as well as the intra-articular environment which can inhibit healing.10-12 A number of patients will develop an irreparable rotator cuff tear due to progression of the tear and tendon retraction, and some patients will go on to develop secondary degenerative changes of the glenohumeral joint termed rotator cuff arthropathy (Fig. 1 and Fig. 2).13

 

Fig. 1.  Rotator cuff arthropathy secondary to rotator cuff disease.

Fig. 2.  U-shaped tear in the rotator cuff.

 

Management

The management of a rotator cuff tear is multifaceted. Conservative management includes analgesia and anti-inflammatory medications, physical therapy, activity modification and subacromial injections of local anaesthetic and/or steroid. Operative interventions include arthroscopic debridement of the tear or repair of the torn rotator cuff, with or without subacromial decompression. Most reports in the literature are procedure oriented, consisting of retrospective single surgeon series with limited numbers of patients. A Cochrane review performed in 200414 analysed interventions for rotator cuff tears and concluded that there is little evidence to support or refute the efficacy of commonly used treatment methods.

 

A suggested approach to management of a rotator cuff tear

The aim in managing a rotator cuff tear is to reduce pain and improve function. The evidence for conservative management of a rotator cuff tear dictates an initial period between six weeks and three months of non-operative treatment unless there is evidence of an acute tear in a younger patient.15-17 Prolonged conservative management in symptomatic patients can have negative consequences. These include increase in tear size, tear retraction, increased difficulty of repair18,19 and muscle atrophy with fatty infiltration, all of which can result in a diminished outcome.19-22

Despite limited evidence, physiotherapy is the mainstay of conservative management of rotator cuff tears. An ultra-sound or MRI scan may be obtained for patients with persistent symptoms that have not improved after two to three months of conservative management. There is no good evidence for or against steroid injection in the management of rotator cuff tears, although empirically these do seem to have a positive effect in some patients. Multiple injections should be avoided however, especially if there is a diagnosed rotator cuff tear that is potentially repairable.

Initial radiological assessment includes an anteroposterior, scapulolateral, and axillary view. If a rotator cuff tear is suspected based on clinical assessment, an ultra-sound or MRI scan can be obtained. An ultrasound scan offers dynamic assessment of the rotator cuff with less expense, relative to a MRI scan, but it is operator dependent. A MRI scan can also evaluate tear size and retraction, but in addition the rotator cuff muscles can be assessed for fatty atrophy which predicts outcome after repair.

 

Conservative Management

Symptomatic rotator cuff tears treated conservatively can give a baseline to which the outcome after surgical intervention can be compared. Bartolozzi, Andreychik and Ahmad15 in a study of 136 patients managed conservatively with symptomatic rotator cuff disease identified that full-thickness tears > 1cm2, symptoms persisting more than 1 year, and functional impairment and weakness were associated with a worse outcome. They recommended that surgery be considered in these patients with those risk factors. Itoi and Tabata17 reported 62 cuff tears in 54 patients that were treated conservatively and found that 72% of patients had good or excellent results at an average of 3.4 years. This however was a selected cohort of patients presenting with mild pain and minimal functional deficit. Bokor et al16 reported that 74% of patients with confirmed rotator cuff tears managed conservatively had minimal or no pain at seven years and 86% were satisfied with their result. In this study, patients who failed conservative treatment and went on to have surgery were excluded, which introduces an obvious selection bias. Samilson and Binder23 report the largest series of conservatively managed full-thickness rotator cuff tears (n=292), demonstrating that 72% of shoulders had more than 150º of abduction after treatment but 40% were rated as having a fair or poor outcome. Hawkins and Dunlop24 reported a smaller series of 33 patients managed conservatively. No patients were excluded and unsatisfactory results occurred in 14 of 33 (42%) with 12 patients eventually undergoing surgery. Patients with an insurance claim were less likely to be satisfied.

 

Oerative Management

Repair of a torn rotator cuff has been shown to give predictable pain relief and functional improvement, with good overall patient satisfaction.25 The results of open, mini-open and arthroscopic rotator cuff repair have all generally been favourable, but approximately 38% of patients suffer a post-operative complication.26 Re-rupture rates of 13%27 to 68%28 have been reported after rotator cuff repair, however patients suffering a re-rupture still have significant improvement in pain and function.29 The re-rupture rate, as assessed by MRI is 20% to 39%30-32 and in larger tears the rate at 2 years is nearly double this (41% to 94%).33-35 Patients with an intact repair have significantly better outcomes.31,34 The outcome of revision surgery for symptomatic failed primary repairs is inferior to successful primary repair, with only 69% of patients being satisfied.36 Despite the risk of complications and tendon re-rupture, rotator cuff repair predictably reduces pain and improves strength and function in symptomatic patients.37

There is great debate throughout the literature as to whether arthroscopic rotator cuff repair is superior to that performed through a mini-open approach.  A recent systematic review by Lindley and Jones38 found no statistically significant difference in postoperative outcome or incidence of re-ruptures of those rotator cuff tendons repaired arthroscopically versus using the mini-open repair technique. There was, however, decreased post-operative pain in the short-term for patients who underwent arthroscopic repair. In addition to the surgical approach for repair, the technique of cuff repair is also contested. Options for this include a single row, double row, or suture bridge repair (Fig. 3). Trappey and Gartsman39 performed a systematic review of the literature to answer this question. They identified four randomised control trials, all of which demonstrated no difference in the clinical outcome between single or double row repairs. The most recent study, by Gartsman et al40, demonstrated a significant difference in the re-rupture rate when comparing a single row repair (20% re-rupture) with a double row suture bridge technique (7% re-rupture) (Fig. 3c). They did not assess clinical outcome and this improved re-rupture rate may translate into a superior patient outcome. Trappey and Gartsman40 suggest that more sophisticated outcome analyses may be needed to confirm the superiority of double row repairs.

 

Fig 3a

Fig 3b

Fig 3c

Fig. 3. Diagrams showing a) a single row repair on the lateral aspect of the foot print, b) a double row repair securing the rotator cuff tendon into the foot print and c) a double row bridging repair securing the rotator cuff tendon into the foot print.

 

Conclusion

Most of the guiding principles used for decision-making in treating rotator cuff disease are based on limited evidence and minimal science. Factors that seem to be important include duration of symptoms, weakness, size of the tear, and muscle atrophy. If surgery is performed, either by a mini-open or arthroscopic technique, a double row bridging repair seems to be biomechanically stronger, provided this can be performed in a tension-free environment. At this point in time however, there is no clinical evidence to support double row repair over single row repair.

 

References

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