first time traumatic anterior shoulder dislocation: a review of current management

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Editorial First time traumatic anterior shoulder dislocation: A review of current management The glenohumeral joint is the most frequently dislocated joint accounting for 45% of all dislocations with an estimated annual incidence of 1.1 per 1000. 1–3 The majority of patients are male in their second or third decade, sustaining the injury during contact sports. 4–6 Overall, 47% of dislocations occur in patients between 15 and 25 years of age with a second peak of incidence occurring in the elderly with low velocity falls. 4 Despite its frequency, the treatment of first-time (FT) anterior shoulder dislocation remains controversial both in the method and length of immobilisation after reduction and also in the role of early surgical stabilisation. Currently in the United Kingdom 90% of cases are treated with immobilisation in a sling in internal rotation (IR) for an average of 5 weeks, however amongst enthusiasts there is a trend towards offering early arthroscopic stabilisation. 7,8 Anterior shoulder dislocations usually occur with the arm in an abducted and externally rotated position and lead to predictable patterns of injury to the labrum, capsuloligamentous structures, glenoid and humeral head. The Bankart lesion, an avulsion injury of the labrum with or without capsular injury inferior to the equator of the glenoid, is the most common but other pathologies are seen. 9 A lesion in which the anterior band of the inferior glenohumeral ligament (IGHL), the labrum and the anterior scapular periosteum are displaced as a sleeve from the anterior scapular neck (anterior labral periosteal sleeve avulsion, the ALPSA lesion) was described by Neviasier. 10 Less commonly a humeral avulsion of the glenohumeral ligament (HAGL lesion) can occur. 11 Complete mid-substance tears of the capsule and IGHL also occur. 12,13 A Bankart lesion in itself is not sufficient to lead to recurrent instability in pathological studies. 14 Plastic deformation of the IGHL occurs either at the time of initial injury or during subsequent instability episodes and it is the combination of the two that causes recurrent instability. 15–17 Glenoid rim fractures are reported in 4– 22% of FT anterior dislocations, are generally small (<10% of the AP diameter of the glenoid) and may represent either a shear fracture or an avulsion fracture of the IGHL attachment. 12,13,18–20 Loss of bone from the anteroinferior glenoid decreases the arc of the articular surface (therefore diminishing the distance that the humeral head must translate prior to recurrent dislocation), decreases the articular surface area (thereby increasing contact pressures) and reduces the depth of the glenoid socket (therefore reducing the effectiveness of the concavity compression mecha- nism). 21,22 The Hill–Sachs impression fracture of the poster- osuperolateral humeral head is reported to occur in 54–100% of FT anterior dislocations when the soft posterosuperolateral bone of the dislocated humeral head impacts on the hard anterior glenoid rim. 12,13,18–20,23–26 These lesions have been classified according to their size, depth and volume but more recently it has been suggested that it is the orientation of the lesion and its combination with glenoid bone loss that is more signifi- cant. 25,27–29 Greater tuberosity fractures are seen in 16% of FT anterior dislocations and in contrast to capsulolabral injury are associated with an older group of patients (mean age 60). 30 In the same series all fractures were displaced >1 cm prior to reduction. After reduction 42% were reduced, 58% were displaced <1 cm and none were displaced >1 cm. Multiple authors have demonstrated that greater tuberosity fractures are associated with a lower risk of recurrent instability. 31–34 Therefore the indication for internal fixation of these fractures is based on the avoidance of cuff dysfunction and impingement, with residual displacement of 1 cm generally considered an indication for surgical intervention. 35,36 Rotator cuff tears occur in 10% of FT anterior dislocations and, similarly to greater tuberosity fractures, occur in an older subgroup of patients. 30 The size of the lesion is variable (14% <1 cm, 48% 1– 3 cm, 25% 3–5 cm, 12% >5 cm). In the initial phase it can be difficult to clinically diagnose a rotator cuff tear due to pain. In patients over 40 years of age, ongoing pain or weakness 3 weeks after a dislocation has a 100% correlation with a full thickness tear, although 15% may be chronic or acute-on-chronic. 30,37 If treated non-operatively 100% will continue to be weak but only 33% have ongoing pain. 37 Surgical intervention can be considered in those patients with an acute tear although this has no bearing on recurrent instability rates. It may be reasonable to treat small tears non-operatively. 38 Management after reduction traditionally involves immobilisa- tion in internal rotation (IR). The typical length of immobilisation is 3–6 weeks but there is a trend towards shorter periods or no immobilisation at all. 3,5,8,34,39,40 The safe position of IR avoids the typical instability position of abduction and external rotation (ER) while conve- niently resting the arm close to the torso. There is mixed evidence both for and against immobilisation. Rowe and Kivoluto showed some benefit from immobilisation up to 3 weeks after disloca- tion. 34,41 In contrast, Hovelius did not show any reduction in recurrent instability rates in a group randomised to immobilisation in a sling for 3–4 weeks compared to a group randomised to symptomatic immobilisation only. 31,39,42 Similarly other authors have not demonstrated any positive effect. 32,43,44 Analysing studies in patients under 30 years of age it was concluded that there was no benefit to immobilisation for more than one week. 45 It is recommended that older patients in particular should be Injury, Int. J. Care Injured 44 (2013) 406–408 Contents lists available at SciVerse ScienceDirect Injury jo ur n al ho m epag e: ww w.els evier .c om /lo cat e/inju r y 0020–1383/$ see front matter ß 2013 Elsevier Ltd. All rights reserved. http://dx.doi.org/10.1016/j.injury.2013.01.001

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Injury, Int. J. Care Injured 44 (2013) 406–408

Editorial

First time traumatic anterior shoulder dislocation: A review of currentmanagement

Contents lists available at SciVerse ScienceDirect

Injury

jo ur n al ho m epag e: ww w.els evier . c om / lo cat e/ in ju r y

The glenohumeral joint is the most frequently dislocated jointaccounting for 45% of all dislocations with an estimated annualincidence of 1.1 per 1000.1–3 The majority of patients are male intheir second or third decade, sustaining the injury during contactsports.4–6 Overall, 47% of dislocations occur in patients between 15and 25 years of age with a second peak of incidence occurring inthe elderly with low velocity falls.4 Despite its frequency, thetreatment of first-time (FT) anterior shoulder dislocation remainscontroversial both in the method and length of immobilisationafter reduction and also in the role of early surgical stabilisation.Currently in the United Kingdom 90% of cases are treated withimmobilisation in a sling in internal rotation (IR) for an average of 5weeks, however amongst enthusiasts there is a trend towardsoffering early arthroscopic stabilisation.7,8

Anterior shoulder dislocations usually occur with the arm in anabducted and externally rotated position and lead to predictablepatterns of injury to the labrum, capsuloligamentous structures,glenoid and humeral head. The Bankart lesion, an avulsion injury ofthe labrum with or without capsular injury inferior to the equatorof the glenoid, is the most common but other pathologies are seen.9

A lesion in which the anterior band of the inferior glenohumeralligament (IGHL), the labrum and the anterior scapular periosteumare displaced as a sleeve from the anterior scapular neck (anteriorlabral periosteal sleeve avulsion, the ALPSA lesion) was describedby Neviasier.10 Less commonly a humeral avulsion of theglenohumeral ligament (HAGL lesion) can occur.11 Completemid-substance tears of the capsule and IGHL also occur.12,13 ABankart lesion in itself is not sufficient to lead to recurrentinstability in pathological studies.14 Plastic deformation of theIGHL occurs either at the time of initial injury or during subsequentinstability episodes and it is the combination of the two that causesrecurrent instability.15–17 Glenoid rim fractures are reported in 4–22% of FT anterior dislocations, are generally small (<10% of the APdiameter of the glenoid) and may represent either a shear fractureor an avulsion fracture of the IGHL attachment.12,13,18–20 Loss ofbone from the anteroinferior glenoid decreases the arc of thearticular surface (therefore diminishing the distance that thehumeral head must translate prior to recurrent dislocation),decreases the articular surface area (thereby increasing contactpressures) and reduces the depth of the glenoid socket (thereforereducing the effectiveness of the concavity compression mecha-nism).21,22 The Hill–Sachs impression fracture of the poster-osuperolateral humeral head is reported to occur in 54–100% of FTanterior dislocations when the soft posterosuperolateral bone ofthe dislocated humeral head impacts on the hard anterior glenoid

0020–1383/$ – see front matter � 2013 Elsevier Ltd. All rights reserved.

http://dx.doi.org/10.1016/j.injury.2013.01.001

rim.12,13,18–20,23–26 These lesions have been classified according totheir size, depth and volume but more recently it has beensuggested that it is the orientation of the lesion and itscombination with glenoid bone loss that is more signifi-cant.25,27–29 Greater tuberosity fractures are seen in 16% of FTanterior dislocations and in contrast to capsulolabral injury areassociated with an older group of patients (mean age 60).30 In thesame series all fractures were displaced >1 cm prior to reduction.After reduction 42% were reduced, 58% were displaced <1 cm andnone were displaced >1 cm. Multiple authors have demonstratedthat greater tuberosity fractures are associated with a lower risk ofrecurrent instability.31–34 Therefore the indication for internalfixation of these fractures is based on the avoidance of cuffdysfunction and impingement, with residual displacement of 1 cmgenerally considered an indication for surgical intervention.35,36

Rotator cuff tears occur in 10% of FT anterior dislocations and,similarly to greater tuberosity fractures, occur in an older subgroupof patients.30 The size of the lesion is variable (14% <1 cm, 48% 1–3 cm, 25% 3–5 cm, 12% >5 cm). In the initial phase it can be difficultto clinically diagnose a rotator cuff tear due to pain. In patients over40 years of age, ongoing pain or weakness 3 weeks after adislocation has a 100% correlation with a full thickness tear,although 15% may be chronic or acute-on-chronic.30,37 If treatednon-operatively 100% will continue to be weak but only 33% haveongoing pain.37 Surgical intervention can be considered in thosepatients with an acute tear although this has no bearing onrecurrent instability rates. It may be reasonable to treat small tearsnon-operatively.38

Management after reduction traditionally involves immobilisa-tion in internal rotation (IR).

The typical length of immobilisation is 3–6 weeks but there is atrend towards shorter periods or no immobilisation atall.3,5,8,34,39,40 The safe position of IR avoids the typical instabilityposition of abduction and external rotation (ER) while conve-niently resting the arm close to the torso. There is mixed evidenceboth for and against immobilisation. Rowe and Kivoluto showedsome benefit from immobilisation up to 3 weeks after disloca-tion.34,41 In contrast, Hovelius did not show any reduction inrecurrent instability rates in a group randomised to immobilisationin a sling for 3–4 weeks compared to a group randomised tosymptomatic immobilisation only.31,39,42 Similarly other authorshave not demonstrated any positive effect.32,43,44 Analysingstudies in patients under 30 years of age it was concluded thatthere was no benefit to immobilisation for more than one week.45

It is recommended that older patients in particular should be

Editorial / Injury, Int. J. Care Injured 44 (2013) 406–408 407

immobilised for a short time to prevent stiffness.33,41 There isdebate whether the arm is immobilised in IR or ER. Cadavericstudies have suggested that ER keeps the capsule in contact withunderlying bone and this effect has since been documented withMR arthrography.46–48 A Cochrane review (2006) suggested therewas no difference in clinical outcome while more recent clinicalstudies have shown mixed results.49–52 Whatever the methodchosen there is a reported non-compliance rate of 20–47%.50,53

The risk of recurrent instability is 26–95% after non-operativetreatment.13,19,20,23,24,31,32,38,39,42,54,55 The wide range reflectspopulation differences between series and different lengths offollow up. Those studies with the highest recurrence rates haveincluded highly selected groups such as military cadets and contactathletes.13,19 The definition of recurrent instability varies withsome authors including symptomatic instability, clinical anteriorapprehension, subluxation, dislocation or multiple dislocations.Risk of recurrence is strongly correlated with age and sex, beinghighest amongst males in their early twenties or youn-ger.30,31,33,34,39,42 The sex difference is significant, with theprobability of redislocation within the first 2 years falling below50% in males age 27 and females at age 17.6 Recurrence rates alsocorrelate with time after the original injury. Hovelius showed arecurrence rate of 30% at 2 years rising to 49% at 25 years andRobinson reported 56% at 2 years increasing to 67% at 5 years (87%recurring in the first 2 years).6,31,39,42,56 Participation in contactsports and forced overhead activity increases the risk.6,57 As aresult of the high recurrence rate after non-operative treatmentnumerous authors have recommended surgical intervention.18–

20,23,24,26,57

It was postulated that arthroscopic lavage might decreasecapsular volume and allow better coaptation of the capsulolabralcomplex with the glenoid rim.18 Wintzell compared the results ofarthroscopic lavage with that of non-operative treatment. Recur-rence rates were significantly reduced at 2 years in those treatedwith lavage (20 vs 60%). Other authors have not shown such afavourable outcome with recurrence rates of 38–55% at 2 and 5years respectively.20,38

The typical Bankart lesion is usually treated by arthroscopicstabilisation using several anchors, which are inserted into theglenoid rim. The aim of soft tissue stabilisation is to restore thenative capsulolabral anatomy. Originally the emphasis was placedon creating a soft tissue bumper effect. However, since it has beenrecognised that plastic deformation of the IGHL occurs withdislocation, a re-tensioning of the inferior capsule has beenconsidered an essential step – which is performed by an inferior tosuperior and lateral to medial capsular shift. Several studies haveassessed the effect of arthroscopic surgery after FT anteriordislocation. Two prospective randomised controlled trials in youngpatients employing arthroscopic techniques have demonstrated alower recurrence rate with operative stabilisation (47–75%ongoing instability after nonoperative treatment vs 10–11% afterarthroscopic stabilisation).23,24 A Cochrane review concluded thatthere was a significantly decreased dislocation rate in young adultstreated by arthroscopic stabilisation.58 In a study of 88 patientsaged 15–35 randomised to arthroscopic washout alone orarthroscopic stabilisation, there was a significantly lower recur-rence rate in those treated by stabilisation (7% vs 38% at 2 years).20

Using the results of their own series, Robinson demonstratedthe need to treat 4.7 patients to eliminate one dislocation and 3.2for symptomatic instability; but in the high-risk group of males<28 years and females <17 years this falls to 2.6.20 Hoveliusestimated that if all FT dislocators of <25 years undergo surgerythen 30% will undergo unnecessary operations.56 It is difficult tocompare the relative costs of the two treatment options. Eachepisode of redislocation entails time off work or education andattendance at an emergency department with radiographs and

reduction under sedation. Functional outcomes are better inpatients treated operatively yet a full health economic analysis hasyet to be undertaken.6,20 Despite the potential benefits 19–56% ofpatients elect to pursue a wait-and-see policy.6,20,30,39,42,54,56

From the evidence reviewed, there is little benefit inimmobilisation of young patients in IR other than for symptomaticbenefit as redislocation rates remain high. Older patients should bemobilised early to avoid stiffness in the knowledge thatredislocation rates are low. They should be examined carefullyfor evidence of a rotator cuff tear once the acute pain has settled.The evidence for bracing in ER to reduce recurrent instability ratesis limited. The recurrence rate of instability can be reduced byarthroscopic stabilisation of the FT dislocator and early surgery,particularly in the younger patient who wishes to continue withhigh-risk activities such as contact, overhead and water-basedsports, should be considered. Patients should be counselled as totheir recurrence rates without surgery allowing them to make aninformed decision.6 It should be acknowledged that there is apossibility of spontaneous stabilisation even in those withrecurrent dislocations.6,56 Routine plain radiographs in threeplanes are recommended after reduction, and axial imaging eitherin form of CT or MRI arthrography if there is suspicion of glenoid orhumeral bone loss or rotator cuff tear.

Arthroscopic soft tissue stabilisation is performed in theabsence of major bone loss. When bone loss has occurred, defectson the humeral and glenoid sides are considered individually andin combination. A final decision on treatment may not be madeuntil the time of arthroscopic assessment. Loss of 15–20% of theanteroposterior diameter of the inferior glenoid is considered asignificant risk factor for recurrence 59,60,61. Rarely a large anteriorglenoid fragment may be fixed directly but it is more common thatglenoid rim fragments are of insufficient size to allow this. Optionsin this situation include a Latarjet procedure or other bone graftingtechniques.62–64 As evidence increases, the management of the FTdislocator should involve assessment by those with experience ofthe available operative techniques.

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G.C.S. SmithT.J.S. Chesser*

I.N. PackhamM.A.A. Crowther

Frenchay Hospital, North Bristol NHS Trust, Bristol BS16 1LE, UK

*Corresponding authorE-mail address: [email protected] (T.J.S. Chesser)