Rotator Cuff Tears at the Musculotendinous Junction: Classification and Surgical Options for Repair and Reconstruction
Peter J. Millett, M.D., M.Sc., Zaamin B. Hussain, B.A., Erik M. Fritz, M.D., Ryan J. Warth, M.D., J. Christoph Katthagen, M.D., and Jonas Pogorzelski, M.D., M.H.B.A.
Arthroscopy Techniques, Vol 6, No 4 (August), 2017: pp e1075-e1085
Although uncommon, rotator cuff tears that occur medially at the musculotendinous junction can result from acute trauma, anatomic force imbalance, or medial row cuff failure following a previous rotator cuff repair. The quality of the torn muscle and tendon along with the length of the remnant tendon stump should be considered before deciding on the most appropriate repair technique. When muscle and tendon quality are sufficient, the tear can often be repaired directly to the remnant tendon stump and compressed onto the greater tuberosity. If the remnant tendon stump is degenerative, of insufficient length, or lacks tendon in which to place sutures, an allograft patch can be used to augment the repair. When the quality of the remaining muscle and tendon are poor or when the muscle is retracted too far medially and is nonmobile, a bridging technique such as superior capsule reconstruction is preferable. The purpose of this report is to (1) highlight that medial cuff failure can occur both primarily and after previous repair; (2) define and classify the 3 major tear patterns that are encountered, and (3) describe the authors’ preferred techniques for medial cuff repair that specifically address each of the major tear patterns.
Although tears near the musculotendinous junction (MTJ) are common in some areas of the body, they infrequently involve the rotator cuff where the majority of tears present with detachment of the footprint from the greater tuberosity. Only a small number of case reports of have described the treatment of rotator cuff tears near the MTJ—many of these reports specifically refer to the infraspinatus1, 2, 3 whereas others refer specifically to the supraspinatus.4, 5, 6 Although the precise etiologies of medial cuff tears are not fully understood, they are likely to be multifactorial and may include any combination of acute or chronic trauma with established subacromial impingement.4, 5, 6
In general, rotator cuff tendon repair techniques aim to restore the anatomic rotator cuff footprint,7 achieve adequate footprint compression,8 minimize gap formation,9 and maximize ultimate load-to-failure.10 With tears at the MTJ, repair techniques rely more on soft tissue–to–soft tissue fixation as opposed to soft tissue to bone. Although we have seen an overall reduction in repair failures with anatomic constructs that follow the aforementioned biomechanical criteria,11 there are still some retears. One of the mechanisms of failure may be related to biologic insufficiency of the repaired cuff tendon (e.g., failure at the suture-tendon interface).12, 13,14, 15, 16, 17, 18 Specifically, repair constructs that have sutures at the MTJ have introduced a new failure mechanism characterized by suture cut-out at or near the MTJ.4, 5, 6
Medial tears of the rotator cuff that occur at the MTJ can occur primarily (without prior surgery), or secondarily after previous rotator cuff repair (secondary or type 2 failures). Both pose relevant treatment challenges. Primary failure usually occurs from a traumatic injury to the shoulder. Secondary injuries occur after previous surgery. Cho et al. described this type of failure and classified it as a type 2 failure where the tendon fails medially, close to the MTJ.12, 19, 20, 21, 22 Secondary medial cuff failure near the MTJ after repair (type 2 failure) has been associated with the placement of knots and abrasive suture materials near the MTJ, thus potentially resulting in acute or chronic subacromial knot impingement, medial stress concentration, tendon strangulation, and/or suture cut-out in this area.12, 19, 20, 21, 22 When failure occurs, the tendon/muscle is found to be torn medial to the previous repair site whereas the cuff tendon insertion remains intact and well fixed to the greater tuberosity.
Surgical treatment of these tears is challenging because of the short or absent medial tendon stump; the lack of sufficient tendon medially, the susceptibility of sutures to tear through degenerated tissues or the medial muscle fibers at the MTJ, the difficulty in restoring the length-tension relation of the cuff tendon without overtensioning the repair site, and the lack of sufficient clinical outcomes data to guide surgical decision making. As a result, when surgeons encounter these types of tears, there is little information to guide them.4, 5,6 The purpose of this report is to highlight that (1) medial cuff failure can occur both primarily and secondarily after previous repair; (2) to define and classify the 3 major tear patterns that are encountered, and (3) to describe our preferred techniques for medial cuff repair that specifically address each of the major tear patterns.
The decision to pursue rotator cuff repair in general is dependent on a number of patient-centered variables, such as symptoms, demographics, comorbidities, physical goals, and the expected outcomes of surgery, among others. Although many of the physical examination findings and biologic features are similar to those found in more common rotator cuff tear variants, there are several pathobiologic features of medial cuff tears that are important indicators of repairability, including the chronicity of the tear, the degree of retraction, the amount of fatty infiltration, the global tissue quality, the quality of the tissue in the medial stump, the length of the remnant tendon stump laterally, the bone quality of the glenoid and greater tuberosity, the acromion morphology, and, in cases of secondary MTJ tears, the number and location of suture anchors used for the previous cuff repair. Three major patterns of MTJ tears occur. Type A tears occur when the tendon and muscle are both healthy and adequate. This tear pattern is seen frequently with primary tears that occur and are treated acutely. Most cases of type A medial cuff tears can be repaired primarily and fixed to the greater tuberosity using a double-row technique. Type B tears occur when there is a healthy muscle laterally, but the remaining medial tendon is short and retracted. When healthy muscle tissue and poor tendon quality is encountered in these type B tears, the medial stump is advanced laterally and an allograft patch can be used to augment the repair. Type C tears occur when the tears become chronic. In such cases, there may be tendon remaining at the footprint but the muscle is retracted, is of insufficient length, and has fatty infiltration (i.e., Goutallier grade 3 or 4). In such cases, the native medial rotator cuff tissue cannot be repaired primarily and some type of reconstructive procedure must be employed such as the recently described superior capsule reconstruction (SCR) procedure, latissimus dorsi tendon transfer, or reverse shoulder arthroplasty. The authors’ present preferred approach is the SCR, as it is proving to be a viable and reproducible surgical option for patients with type C tears who are otherwise poor candidates for reverse total shoulder arthroplasty (RTSA) or tendon transfer.23, 24, 25
Patient Positioning and Anesthesia
After placement of a regional interscalene block and induction of general anesthesia, the patient is placed in a modified beach-chair position and the operative extremity is situated in a pneumatic arm holder (Tenet T-Max Beach Chair and Spider arm positioner; Smith & Nephew, Memphis, TN). The operative shoulder and axilla are prepared and draped using sterile techniques.
Diagnostic arthroscopy is first performed after establishing a posterior viewing portal and an anterior working portal through the rotator interval. The long head of the biceps tendon, biceps-labral complex, glenoid labrum, articular cartilage, and undersurface of the torn rotator cuff are thoroughly evaluated and concomitant pathologies are addressed as necessary. An anterolateral portal is established and subacromial bursectomy is performed to optimize visualization. In cases of secondary tears with medial cuff failure after previous repair, careful inspection of the undersurface of the acromion and its relation with the greater tuberosity with intraoperative dynamic passive elevation is recommended because these tears have been associated with both acute and chronic subacromial knot impingement and the presence of a corresponding impingement lesion.26 Where necessary, subacromial decompression is performed using an arthroscopic shaver (Synergy Resection Shaver Console and APS II Handpiece; Arthrex, Naples, FL) and, in cases of dynamic impingement during passive elevation, additional acromioplasty and release of the coracoacromial ligament is performed through an accessory posterolateral portal. A Bigliani type 1 acromion is created. When the critical shoulder angle is large, a lateral acromioplasty is also performed.27 When present and symptomatic, the long head of the biceps tendon is released from the superior labrum and open subpectoral tenodesis is performed, after completion of the cuff repair. Attention is then turned to repairing the torn rotator cuff.
Tears can be classified as primary (no prior surgery: type 1 tear) or secondary (occurring after prior rotator cuff repair: type 2 retear) and simultaneously by their tear patterns (Table 1). Accurate diagnosis of the tear pattern is crucial as this determines the optimal management strategy (Table 1).
|A. Tendon on footprint, short but adequate medial tendon||Complex bridging repair|
|B. Tendon on footprint, deficient medial tendon, with healthy muscle (MTJ can reach medial footprint)||Bridging repair with graft augmentation|
|C. Tendon on footprint laterally but deficient medial tendon with retracted, atrophied muscle with fatty infiltration||Interposition graft (superior capsule reconstruction), latissimus dorsi tendon transfer, or reverse total shoulder arthroplasty|
NOTE. Accurate diagnosis of the tear pattern is crucial as this determines the optimal management strategy. These tears are simultaneously classified as primary (no prior surgery: type 1 tear) or secondary (occurring after prior rotator cuff repair: type 2 retear).
Type A Medial Cuff Tears
Technique: Complex Bridging Repair
Primary medial cuff tears (type 1A MTJ tears) (Figs 1 and 2) that are treated promptly are typically amenable to repair to the lateral tendon stump as long as the final fixation construct diverts tensile stresses through the suture anchors rather than through the apposed tear edges (Fig 3). There are also many secondary type A MTJ tears that can be repaired with this method. With type A tears, there is a small amount of tendon that remains with the medial MTJ stump that aids in repair and will resist suture cutout. The remaining medial tendon stump is also typically fairly mobile and reaches the footprint. In such cases, we prefer to use an anatomic linked or bridging construct with suture tapes and sutures to decrease the chance of suture cutout after repair.
In these cases, the torn edge at the MTJ is first debrided to remove frayed and degenerative tissue and a grasper is used to assess the tendon’s mediolateral mobility. Intra- and extra-articular releases are performed as necessary to allow for adequate lateral excursion of the muscle substance in preparation for repair—this step is critical for the planning of anchor placement that ensures restoration of the resting length-tension relation of the torn cuff muscle. The footprint on the tuberosity is prepared and can be medialized 1 to 2 mm onto the articular surface to create a bony bed for healing. This step is very important to achieve healing in primary repair of tears at the MTJ. The goal is to get the medial tendon stump to heal not only to the lateral tendon stump but also to the bone of the greater tuberosity. In secondary type A MTJ tears, suture anchors, if present from the previous repair, should be removed to improve the biology at the bone-tendon interface where healing and tissue regeneration needs to occur.
Typically, a hybrid double-row bridging repair with 4 anchors is performed (2 medial and 2 lateral anchors).10, 28Although rarely needed, additional anchors may be added when larger tears are encountered.23 After preparing the footprint and debriding 1 to 2 mm of the articular margin, the medial anchors are placed in the greater tuberosity. We recommend maintaining an anteroposterior bone bridge of about 10 mm between each medial anchor. An arthroscopic punch is used to create a bone socket to accommodate the anterior-medial anchor approximately 1 to 2 mm medial to the articular margin into the newly created footprint. A vented 4.75-mm knotless suture anchor loaded with no. 2 suture tape is placed in this anterior-medial socket (BioComposite SwiveLock anchor with FiberTape; Arthrex). With an arthroscopic grasper and suture passer (QuickPass SutureLasso; Arthrex), each limb of the suture tape is passed through the medial muscle/tendon remnant, approximately 3 to 5 mm medial to its lateral tear edge. Care should be taken to avoid passing the suture tapes too medially as this will overtension the repair. When a small stump of tendon remains just lateral to the MTJ, as is frequently the case for type A tears, care should be taken to pass the suture tapes through the residual tendon to optimize the length-tension relation of the repair. Preparation of the posterior-medial anchor is performed in an identical fashion while taking care to maintain a 10-mm bone bridge relative to the first medial anchor.
After placement of the medial anchors, nonabsorbable sutures are also shuttled at least 2 mm from each tear edge into the medial and lateral tendon stumps. The medial and lateral tear margins are then drawn together, and arthroscopic knots are tied. This creates medial to lateral, margin-convergence-to-bone stitches at each anchor. Although the number of sutures required for adequate repair depends on the size of cuff tear, we advise tying approximately 1 knot per 0.5 to 1.0 cm of anteroposterior length of repaired tissue. Typically, there are 2 sutures placed, 1 per medial anchor. Additional medial to lateral simple sutures can be placed as deemed necessary to sew the torn medial MTJ stump to the lateral tendon stump (Fig 4).
After reducing and suturing the medial and lateral tear margins, a lateral row of anchors is placed to bridge the tapes over the repair construct. An arthroscopic punch is used to prepare the anterior-lateral bone socket approximately 15 mm lateral to the corresponding medial anchor. One limb of suture tape from each medial anchor is retrieved through the anterolateral portal and preloaded into the eyelet of the anterior-lateral anchor. Gentle tension is applied through the suture tapes to reduce and compress the cuff tissue against the greater tuberosity. While maintaining adequate tension, the anterior-lateral anchor is guided into place using a driver and rotated clockwise to achieve bony fixation. The remaining suture limbs are cut, thus completing anterior-lateral anchor insertion. This procedure is repeated for placement of the posterior-lateral anchor while maintaining a minimum 15-mm distance from both the posterior-medial and anterior-lateral anchors. The tapes help disperse the force over a greater surface area and decrease the risk of cutout and at the same time serve as a bioscaffold for new tissue growth. From our experience with second look arthroscopy and from postoperative magnetic resonance images, the suture tapes act as biological scaffolds for new tissue growth that aid in healing. Furthermore, the linked and crossed nature of the construct improves the biomechanics by dispersing forces across the whole repair construct to minimize point loading, maximize self-reinforcement,29and minimize the risk of suture cutout. After the repair, complete dynamic evaluation is then performed to ensure adequate stability and security of the repair.
Type B Tears
Chronic Medial Cuff Tears with Adequate Muscle Quality and Insufficient Tendon Length
In contrast to more acute cases, chronic medial cuff tears often exhibit insufficient tissue quality not suitable for primary repair. There may be lateral tendon that remains, but in type B cases, the medial torn rotator cuff tendon is deficient (too short) whereas the muscle remains healthy. Patch augmentation can be performed in these cases (Fig 5), especially when the quality of muscle tissue is adequate for suture holding but the quality of the remnant tendon stump is insufficient to maintain postoperative knot security.30, 31 This technique can also be used when lateral excursion of medial cuff tissue remains inadequate for primary repair to the lateral tendon stump even after extensive releases. Augmentation of such tear patterns can be useful in cases such as this.30, 31
When using tissue augmentation, most studies suggest that allografts work better than xenografts.32 We believe that active patients who present with chronic medial cuff tears with insufficient lateral excursion (type B MTJ tears) are particularly suited for this procedure, particularly when the tendon can reach to the medial aspect of the footprint on the greater tuberosity. Although the operation is now typically performed arthroscopically, for many years we did open repair with patch augmentation through a deltoid split for larger tears or when an extended double-row repair is anticipated and good results were obtained.31 It should be noted that current commercially available allograft materials are not approved by the Food and Drug Administration to span across a tissue defect more than 1 cm in distance and, thus, using these materials to span larger gaps is considered off-label use.
Technique: Double-Row Repair with Patch Augmentation
Following diagnostic arthroscopy (as described above), subacromial bursectomy, decompression, and acromioplasty are performed as necessary. Acromioplasty is often done in this setting to prevent graft abrasion beneath the acromion. The lateral tendon stump is resected, previous suture anchors are removed where applicable, and the greater tuberosity footprint is debrided to a bleeding surface. An arthroscopic ruler is used to measure the area of tendon loss that corresponds to the required dimensions of the allograft patch (ArthroFlex; Arthrex). On the back table, the patch is then trimmed to match the planned area of augmentation. The planned sites for medial suture anchors are prepared using the techniques described above, each anchor is double-loaded with no. 2 nonabsorbable suture (FiberWire; Arthrex) and no. 2 suture tape (FiberTape; Arthrex), and each medial anchor is inserted while maintaining an adequate bone bridge. One strand each of the nonabsorbable suture and the suture tape are passed through the medial cuff remnant approximately 5 mm medial to the tear edge using a standard shuttling device. Each limb of suture and suture tape is retrieved and pulled through the anterolateral portal. The suture tapes are then passed through the medial and lateral regions of the patch allograft ex vivo according to its planned in vivo positioning while maintaining a distance of at least 5 mm from its cut edges.
With the arthroscope in the posterior portal, the patch is introduced into the subacromial space through the anterolateral portal following the path of the suture tapes, which guides the patch allograft into the correct position on the medial cuff remnant. Using the previously loaded no. 2 nonabsorbable sutures tied over the allograft in a horizontal mattress configuration, the remnant medial cuff tissue is reduced and secured to the greater tuberosity together with the patch allograft. The planned sites for lateral row anchor placements are then marked using a radiofrequency ablator as described above. An arthroscopic punch is again used to prepare the bone sockets laterally. One limb of suture tape from each medial anchor is retrieved and loaded into another knotless suture anchor that is subsequently driven into the first lateral bone socket. The suture tapes are then pulled to achieved adequate tension, thus reducing the patch allograft laterally and completely covering the greater tuberosity footprint. The suture tails are then cut and the procedure is repeated as necessary using the remaining limbs of suture tape from each medial anchor. In this way, the graft acts to reinforce the repair and as an augment for new tissue growth (bioscaffold).
Our routine postoperative rehabilitation protocol after rotator cuff repair consists of early passive range of motion for 4 weeks limited to 30° of external rotation, 90° of abduction, and 120° of forward flexion, after which full passive and active-assisted range of motion exercises are permitted. For type B and C MTJ tears where a graft is used, we immobilize in a sling for 6 weeks with an abduction pillow to allow for the graft to incorporate. At 6 weeks, passive motion is started, and active motion is allowed at 8 weeks. When tenodesis of the long head of the biceps tendon is performed, resisted elbow flexion is restricted up to 4 weeks postoperatively. For type A tears, active shoulder motion exercises are commenced at 6 weeks. Full return to daily activities (including sports) is typically achieved after 4 to 6 months of structured rehabilitation.
Rotator cuff tears that occur medially near the MTJ are relatively uncommon, but they can have devastating effects on shoulder function and the quality of life of affected patients when appropriate surgical management is not performed. Because of the number of rotator cuff repairs that are being performed, secondary MTJ retears (type 2 tears) are being seen more frequently. Medial cuff tears are difficult to repair and have few reported treatment methods. In addition, the lack of clinical outcomes data following surgical repair of medial cuff tears provides little guidance toward surgical decision making in either the primary or revision setting.
This article highlights that MTJ tears do occur primarily, and it is important for the surgeon to recognize this type of tear pattern preoperatively and intraoperatively because the repair technique should be modified to deal with the pathoanatomy. Secondary MTJ tears are also being seen more commonly.12 The mechanisms of secondary medial repair failures are often attributed to stress concentration at the medial row, subacromial knot impingement, decreased vascular inflow, use of braided suture materials, and overtensioning of repair constructs.12, 19 Primary prevention is one way to address secondary type 2 retears, and techniques that utilize knotless, linked, bridging constructs have been developed to prevent tissue strangulation medially and better force distribution.10, 43 The use of wider suture tapes with these knotless repairs as described in this report is also thought to not only improve the biological healing environment by decreasing the compressive stress per unit area of tendon8, 28 but also decrease the risk of a type 2 retear. Another prevention strategy with this construct is that it more closely restores the native length-tension relation of the posterosuperior rotator cuff without compromising overall construct stability.44, 45 Furthermore, the lack of medial knots avoids the possibility of acute or chronic postoperative knot impingement within the subacromial space26 while also decreasing operative time46 and improving technical efficiency.29, 47 We have also observed new tissue growth on the suture tapes in second look arthroscopy and in postoperative magnetic resonance images, and believe this acts as a scaffold for tissue regeneration.
In our recently published results of knotless double-row repair in 44 patients older than 70 years, median satisfaction was 10/10, outcomes scores improved significantly, and no patients required revision surgery after a minimum 2-year follow-up period.48 Similar findings have been reported by multiple studies.13, 17, 49, 50Therefore, where possible, we prefer to perform bridging double-row repair for type A MTJ tears that occur either primarily or after previous double-row repair. When there is healthy muscle but a short, deficient medial tendon (type B MTJ tears) the repair can be augmented with a collagen graft. For those who present with type C MTJ tears with large tears and poor tissue quality, SCR is currently our preferred surgical approach for young and active patients, whereas RTSA is reserved for elderly and more sedentary patients with type C tears.
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