Abstract
While arthroscopic Bankart repair yields high success rates, bone loss on the glenoid or humeral head can portend a poor outcome. The authors recommend a thorough evaluation including computed tomography (CT) scanning to best evaluate the amount of bone loss. Multiple studies have shown that the outcomes of revision stabilization procedures are inferior to the respective primary procedure; thus, it is of paramount importance to select the correct index procedure to optimize patient outcome. The authors present the American perspective on treating shoulder instability. For patients with a small on-track Hill Sachs lesion and less than 10 % glenoid bone loss, an isolated arthroscopic Bankart repair is appropriate. This procedure is also recommended for bony Bankart lesions, as well as in overhead throwing athletes. With an engaging Hill Sachs lesion and less than 15 % glenoid bone loss, the authors recommend the addition of a remplissage to the arthroscopic Bankart repair. For patients with up to 15 % bone loss or following a failed previous arthroscopic repair, the authors advocate for open Bankart repair. They recommend Latarjet in patients with a non-engaging Hill Sachs lesion greater than 15 % bone loss. Patients with bone loss over 30 % would benefit from bone grafting with iliac crest autograft or distal tibia allograft for stabilization. In summary, the authors believe that the index procedure provides an opportunity to optimize patient outcome and careful consideration of the treatment options is warranted.
Zusammenfassung
Die Erfolgsrate des arthroskopischen Bankart-Repair ist hoch, ein Knochenverlust am Glenoid oder Humeruskopf kann jedoch auf ein schlechtes Outcome hindeuten. Die Autoren dieses Beitrags empfehlen eine eingehende Untersuchung einschließlich Computertomographie (CT), um das Ausmaß des Knochenverlusts optimal beurteilen zu können. In diversen Studien waren Revisionsoperationen zur Stabilisierung dem jeweiligen Primärverfahren bezüglich der Behandlungsergebnisse unterlegen. Daher ist die Wahl des besten Verfahrens für den Ersteingriff entscheidend für die Optimierung des Patientenoutcomes. Im vorliegenden Beitrag wird die Therapie der Schulterinstabilität aus amerikanischer Perspektive geschildert. Für Patienten mit kleiner Hill-Sachs-Läsion im Kontaktbereich („on track“) und weniger als 10% glenoidalem Knochenverlust eignet sich ein isolierter arthroskopischer Bankart-Repair. Dieses Verfahren wird auch für knöcherne Bankart-Läsionen empfohlen, zudem für Sportler, die Überkopfwürfe ausführen. Bei einer „engaging Hill Sachs lesion“ und weniger als 15% glenoidalem Knochenverlust empfehlen die Autoren eine Remplissage zusätzlich zum arthroskopischen Bankart-Repair. Patienten mit bis zu 15% Knochenverlust oder nach einer gescheiterten arthroskopischen Rekonstruktion sollten einem offenen Bankart-Repair unterzogen werden. Für Patienten mit „non-engaging Hill Sachs lesion“ und über 15% Knochenverlust empfehlen die Autoren das Latarjet-Verfahren. Patienten mit Knochenverlust über 30% profitieren von einer Stabilisierung mit autologem Beckenkamm- oder allogenem distalem Tibiatransplantat. Zusammenfassend sind die Autoren der Meinung, dass der Ersteingriff eine Möglichkeit bietet, das Patientenoutcome zu optimieren. Daher ist eine sorgfältige Abwägung der Behandlungsoptionen erforderlich.
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Introduction
Anterior shoulder dislocations produce characteristic anteroinferior capsulolabral injuries that are commonly treated with arthroscopic repair; however, the presence of bone loss either on the glenoid or humeral head can lead to failure of an arthroscopic repair in up to 67% of cases [1]. Glenoid pathology has been reported in up to 95% of patients with anterior shoulder instability [2]. Following recurrence of instability, 72% present with glenoid lesions and 88% with Hill Sachs lesions [3]. Emerging evidence indicates that bipolar lesions that are each below critical values can also contribute to failure of arthroscopic repair [4, 5]. Recognition of these defects in guiding treatment is paramount to success in the treatment of shoulder instability. Advancements in the understanding of the glenohumeral joint and its stabilizers, as well as imaging technology, have facilitated recognition of these defects as risk factors for failure.
History and imaging
The initial evaluation of anterior instability involves a proper history, physical exam, and imaging. Critical factors to obtain in history include age, number of dislocations, dislocations at night, and type and level of sport. Younger age of less than 22 years is recognized as a strong predictor of recurrent instability following isolated arthroscopic Bankart repair [6, 7]. Dislocation frequency has been shown to be associated with severity of glenoid bone loss, which guides treatment [8, 9]. A recent prospective study by Dickens et al. evaluated the effect of a single instability event on the amount of glenoid bone among patients with first-time and recurrent instability in young active patients [10]. The study reported that an initial dislocation event can result in 6.8% glenoid bone loss, while recurrent instability patients can lose 22.8%. These findings support early stabilization in this population to provide stability and prevent continued erosion of glenoid bone stock. Additionally, dislocation episodes at night with minimal effort would indicate the presence of bone loss. The type and level of sports are each independently associated with recurrent instability following arthroscopic Bankart repair [1]. Competitive athletes and athletes in collision overhead sports are at greater risk for failure. The physical exam may be limited due to pain and apprehension in an acute setting; however, based on the authors’ experience, patients with significant bone loss may demonstrate a positive apprehension sign at lower angles of abduction and external rotation. Standard imaging should begin with orthogonal views of the shoulder including anteroposterior (AP), axillary, and West Point views to evaluate overall alignment, bone stock, and fracture. Loss of the anteroinferior glenoid contour or a visible Hill Sachs lesion should raise strong suspicion for significant bone loss. For further evaluation of bone loss, advanced imaging is strongly recommended. Computed tomography (CT) with three-dimensional (3D) subtraction views of the glenoid and humerus provide an accurate evaluation of bone loss. At the authors’ institution, for a young (age < 40 years) patient with anterior instability with low probability of a rotator cuff tear, the preference is for CT scan. Collectively, the initial evaluation helps define the best treatment for the patient.
Evaluating bone loss
Up to 95% of patients with anterior shoulder instability present with glenoid pathology [11]. In recurrent instability cases, 72% may have glenoid defects and 88% Hill Sachs lesions. In Nakagawa’s series, 29.8% of primary instability patients presented with bipolar lesions; after recurrence, 72% of patients presented with bipolar lesions [3].
Measurement techniques of glenoid bone loss are variable and range from descriptors of the shape of glenoid to surface area measurements. Nonetheless, it is important to evaluate bone loss with a technique that is consistent and accurate. Glenoid bone loss can be evaluated by overall glenoid morphology, illustrated by Burkhart, or by glenoid height and width to calculate bone loss [1, 12]. The authors’ institution favors the best-fit circle technique in which a circle is placed over the inferior glenoid on a sagittal view [13]. From this view, the width of bone loss orthogonal to the glenoid’s longitudinal axis can be divided by the circle’s diameter to calculate the percentage of glenoid bone loss (Fig. 1). Critical bone loss, based on cadaveric studies, has previously been defined for the glenoid to be 20–25% [1, 14,15,16]; however, recent studies have redefined this value. In their clinical study, Shaha et al. showed that glenoid bone loss of 13.5% is associated with poor outcomes following isolated arthroscopic Bankart repair, even in the absence of recurrent instability [4]. Dickens also reported a critical value of 13.5% among a cohort of intercollegiate American football players [5].
Our understanding of the Hill Sachs lesion also continues to evolve. Burkhart described the concept of the engaging Hill Sachs in which the long axis of the lesion is parallel to the anterior glenoid with the shoulder in abduction and external rotation [1]. In addition to orientation, the position of the lesion is important. Yamamoto introduced the concept of the glenoid track in which the integrity of the track and the location of the lesion can predict bony stability [17]. The authors defined the glenoid track as the contact patch between the superolateral aspect of the posterior humeral head and the glenoid when the arm is in abduction and external rotation. Larger and deeper Hill Sachs lesions are more likely to be engaging, with one study associating a decrease in stability once 25% of the humeral head is involved [18]. More recent studies have indicated the importance of the specific position within the track, with peripheral track lesions representing a subcritical but meaningful lesion [19]. Additionally, consideration must be given to the laxity of the soft tissue stabilizers surrounding the bony defect. Despite these advancements, there is no consensus with regard to the optimal measurement technique for humeral head bone loss.
Recent studies indicate that combined bone loss of the humeral head and the glenoid is a significant factor in evaluating treatment options and cause for failure. Even though each lesion fails to meet the individual threshold for critical bone loss, the osseous deficit can lead to instability, since an off-track lesion more readily engages with smaller glenoid lesions [20, 21]. A Hill Sachs lesion in an off-track position can amplify the effect of glenoid bone loss. Shaha et al. reported that the presence of an off-track Hill Sachs lesion can compromise an isolated arthroscopic Bankart repair, with a 75% failure rate [22]. A recent cadaveric study demonstrated that lesions involving as little as 8–15% of the glenoid combined with a medium-sized Hill Sachs lesion can produce recurrent instability following an isolated Bankart repair [23]. The glenoid track concept has proved useful in evaluating bipolar bone loss and guiding treatment.
Treatment algorithm
Of paramount importance is selection of the index procedure to treat anterior instability. Multiple studies report unacceptably high failure rates following revision arthroscopic soft tissue repair. Ryu and Ryu reported a 27% failure rate in their series with an isolated arthroscopic Bankart repair [2]. The addition of a remplissage did not improve these results; McCabe et al. reported a failure rate of 36% in this group [24]. Thus, it is important to select the optimal procedure at the primary surgery (Fig. 2).
From the authors’ experience, an isolated arthroscopic Bankart repair can be considered in patients with a small on-track Hill Sachs lesion and less than 10% glenoid bone loss. Exam under anesthesia should yield no more than 2+ on load and shift. In their practice, this makes up the majority of the procedures for anterior stabilization. It is important to evaluate the quality of the capsulolabral tissue, since repeated dislocations can lead to labral degeneration and a patulous capsule [8, 25]. In 2005, Sugaya described arthroscopic repair of the bony Bankart lesion, which the authors agree with [26]. Following strict selection criteria and using a modern surgical technique, Leroux reported a recurrence rate of 8% following arthroscopic stabilization for contact athletes [27]. This low failure rate included procedures performed on patients without glenoid or humeral bone loss and utilized the lateral decubitus position with a minimum of three suture anchors.
If the Hill Sachs lesion engages with glenoid bone loss less than 15%, an arthroscopic Bankart repair with remplissage is a reasonable option. Results thus far are promising. Boileau reported 98% stability with 90% of 41 patients returning to sport at a minimum 2‑year follow-up [28]. Franceschi et al. compared 25 patients undergoing arthroscopic Bankart repair to 25 patients undergoing the same procedure plus a remplissage [29]. They reported a 20% recurrence rate in the Bankart group alone compared to none in the remplissage group. Nourissat et al. reported one-third of patients described posterosuperior shoulder pain but did not note range of motion deficits [30]. Other studies have noted a decrease in abduction between 2 and 8 degrees [31,32,33,34]. In a study of return to sports following remplissage, Garcia et al. reported 95.5% returning to full sports at 7 months; however, 65.5% of overhead throwers complained of decreased range of motion during throwing with an average loss of external rotation of 4.8 degrees [35]. As such, the authors recommend arthroscopic Bankart repair without remplissage in overhead athletes, since range of motion is critical to their sport.
Patients that present with a non-engaging Hill Sachs lesion with greater than 10% bone loss demonstrate inferior outcomes following arthroscopic Bankart repair [4, 5]. The Latarjet has become very popular in the past decade for this clinical scenario, while open Bankart has fallen out of favor. Multiple reports support favorable outcomes following Latarjet [36,37,38,39,40]. A recent analysis of American Board of Orthopaedic Surgery (ABOS) case logs from 2004–2013 indicates a trend towards increased use of bone block procedures; however, the complication rate remained high at 20.8% [41]. Reported complications include axillary or musculocutaneous nerve palsy, infection, coracoid non-union, failure of fixation, and increased risk of osteoarthritis. Additionally, Di Giacomo reported an average of 59.5% osteolysis of the coracoid graft despite no recurrent dislocations, indicating that the bone block effect may not be the primary stabilizing force from the Latarjet [42]. In the revision setting following a failed Latarjet procedure, changes in the anatomic relationships of the musculocutaneous and axillary nerve may predispose them to injury [43]. Yang et al. noted that all of their complications were from patients that had failed prior shoulder stabilization surgery [44]. Shah et al. reported on 47 patients undergoing Latarjet and noted a trend towards higher prevalence of complication rates when the patient had undergone multiple prior shoulder surgeries [45]. Thus, the Latarjet is a technically demanding procedure that produces its best outcomes as a primary procedure. With this in mind, the authors believe a role remains in shoulder stabilization for open Bankart repair. They reserve this for young male collision athletes with a history of multiple dislocations and glenoid bone loss up to 15%. Patients that have failed an arthroscopic Bankart are also indicated for open Bankart repair. The open procedure allows for double row fixation of the capsulolabral complex, capsular plication, and a dual capsular shift involving the inferior and superior leaflets to doubly reinforce the capsule. As such, a more robust repair is possible and suitable for the revision setting. The open Bankart has been a reliable option for over 60 years. Moroder et al. reported 20 year follow-up of open Bankart repairs, which resulted in 95% satisfaction and 15% recurrent instability; however, of those with recurrent instability, only 4.2% underwent reoperation [46]. More recently, Mohtadi compared open to arthroscopic Bankart repair and found equivalent quality of life scores but significantly reduced recurrence rates in the open group [47]. Thus, the authors believe that open Bankart repair is a reasonable option in this population.
Nonetheless, the Latarjet procedure remains an excellent option for cases that can overwhelm an open Bankart repair. The authors recommend Latarjet in patients with > 15% glenoid bone loss—lowering to 10% in the revision setting—with an off-track glenoid lesion. Additionally, the presence of marked apprehension on exam or a 3+ load and shift on exam under anesthesia would also support the application of the Latarjet procedure.
From the author’s experience, more severe bone loss over 30% would benefit from bone grafting with iliac crest autograft or distal tibia allograft. Iliac crest provides the healing advantage of autograft with the volume and contour needed to restore the glenoid. Disadvantages of this procedure include donor site morbidity, lack of articular cartilage on the graft, and potential for accelerated osteoarthritis due to contact with the humeral head [48, 49]. Distal tibia has been shown to closely match the contour of the glenoid as well as provide articular cartilage [50]. The authors reserve these procedures for severe cases of bone loss or the revision setting.
Conclusions
The treatment of anterior shoulder instability continues to evolve as surgical techniques are refined and longer-term studies are published. Multiple factors inform the treatment algorithm for anterior instability. Age as well as type and level of sport can drive the treatment decision. For example, the demands of the stable shoulder are different for the middle-aged patient looking to wash his or her hair compared to a young contact athlete. Additionally, the allure of a minimally invasive arthroscopic Bankart should be carefully weighed against the evidence supporting more invasive procedures. The primary stabilization procedure represents an opportunity to produce the best outcome for the patient in light of poorer outcomes and higher recurrence rates following revision procedures.
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R. Kakazu, M.R. LeVasseur, R.A. Arciero, and A.D. Mazzocca declare that they have no competing interests.
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Kakazu, R., LeVasseur, M.R., Arciero, R.A. et al. State of the art for treatment of bony defects around anterior shoulder instability—the American perspective. Obere Extremität 16, 16–21 (2021). https://doi.org/10.1007/s11678-021-00631-2
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DOI: https://doi.org/10.1007/s11678-021-00631-2