Current Options in Tendon Transfers for Irreparable Posterosuperior Rotator Cuff Tears^[*]

Abstract

Massive irreparable posterosuperior rotator-cuff tears are debilitating lesions that usually require surgical treatment. Even though there is no consensus regarding the best surgical technique, tendinous transfers around the shoulder are the most commonly performed procedures. The latissimus dorsi tendon remains the most commonly used, but different modifications to the original technique have been shown to minimize complications and to improve functional results and satisfaction. Other techniques, such as the transfer of the lower trapezius tendon, are promising and should be considered, especially for patients with isolated loss of external rotation. The present paper is a literary review regarding tendon transfers for irreparable posterosuperior rotator-cuff tears.

Keywords

shoulder - rotator cuff injuries - tendon transfers - review

Introduction

Rotator-cuff-tear (RCT) repairs are among the most common shoulder surgeries.[1] However, tendon-to-bone healing is not always successful or predictable,[2] because it depends on a variety of factors, including biomechanical and biological ones, the latter being influenced by the patient's age.[3] As the population is rapidly aging, the prevalence of failed rotator-cuff repairs is also increasing.[1] [3] The failure rates of massive posterosuperior rotator-cuff repairs are reported to range from 21% to as high as 91%.[4] [5] [6] Failures and complications following revisions are reported to be even significantly higher.[7] [8]

There is no consensus regarding the definition of irreparable RCTs. That being said, whenever a lesion is determined to be irreparable, there are many treatment options, starting with nonsurgical treatments.[9] Regarding the surgical options, there is controversy about the best treatment available. Boileau el al[10] and Walch et al[11] showed satisfactory results after tenotomy of the long head of the biceps (LHB) alone in elderly patients. Other procedures have been reported, including rotator-cuff debridement (with or without concomitant suprascapular nerve release),[12] partial cuff repair,[13] [14] [15] tendon transfers,[16] [17] [18] [19] and reverse shoulder arthroplasty (RSA).[20] The latter, however, is probably not the best option in younger and physically-active patients, because the longevity of these implants in this population is yet unknown, and also because RSAs can still be used as a salvage procedure after the failure of other techniques. More recently, superior shoulder capsular reconstruction[21] [22] [23] [24] [25] [26] [27] [28] has been advocated, but its reported functional results are in their infancy,[23] [29] and longer follow-up periods are needed to confirm its long-term efficacy.[30]

Despite being relatively difficult surgical procedures and requiring accurate patient selection, tendon transfers can significantly improve the quality of life of the patients.[16] [18] [31] This is especially important for young and physically-active patients with lesions graded as Hamada et al[32] stages 1 and 2 (that is, without both glenohumeral arthritis and static proximal humeral head migration), because they may be the only feasible definitive (that is, long-term) treatments available.[30]

The aim of the present paper is to review the literature regarding tendon transfers for irreparable posterosuperior RCTs (that is, the ones involving the supra- and infraspinatus tendons), as the posterosuperior is by far the most common type of RCT.[1] In this context, the latissimus dorsi tendon (LDT) –accompanied or not by the teres major tendon (TMT) – is the most commonly transferred tendon.[33] The alternatives include isolated TMT transfer[34] [35] [36] [37] and the more recently described transfer of the lower trapezius tendon (LTT).[38] [39]

Latissimus-Dorsi-Tendon (LDT) Transfer

The earliest and also most studied transfer is that of the LDT, which was originally described by Gerber et al,[17] and is performed using a double open-approach technique (a posterior approach and a superior transdeltoid approach). The transferred tendon is attached superolaterally to the greater tuberosity (by transosseous sutures) and anteriorly to the subscapularis tendon, therefore changing the latissimus dorsi into a shoulder abductor and external rotator (as opposed to its original role as an internal rotator an adductor) ([Figure 1]). The rationale behind this procedure is: to restore humeral-head centering (as the intact anterior subscapularis force is now joined by the new posterior force[40]); and to improve active external rotation (ER) of the shoulder.

Fig. 1 (A-C) Latissimus dorsi transfer using a double-incision technique. Representation of a right shoulder. (A) Posterior view. A posterior incision is made over the lateral border of the palpable latissimus dorsi belly, which is then separated from the more superior and medial teres major muscle. (B) Posterior view. The tendon is detached from the humerus and then is transported to the subacromial space with a clamp that is brought from the superior to the posterior incision, placed between the posterior deltoid and the long head of the triceps muscle. (C) Superior view. The transferred tendon is then anchored to an osseous trough in the superolateral humeral head (over-the-top placement), and any remaining cuff is sutured to the transfer.

In 1992, Gerber[16] published his postoperative results. A total of 17 patients were followed for an average of 33 months postoperatively, showing that for the subgroup of patients with normal subscapularis function (12 of the total 17), around 80% of normal shoulder function was reestablished. Therefore, this was the first study indicating that the LDT could be a safe and valuable alternative for these patients.

Many other subsequent papers[18] [19] [31] [33] [41] [42] [43] [44] [45] [46] [47] [48] have also shown that satisfactory results following LDT transfer could be achieved. However, these satisfactory results could not be easily predicted. The probable reason for that, besides the proper surgical technique, is that proper patient selection may also crucial in order to obtain satisfactory and predictable results, as it will be discussed subsequently.

While no upper age limit has been defined, a recent systematic review[46] noted a mean age of 59 years for LDT transfer, and showed that the indication could be even extended to elderly patients with Hamada et al[32] stage-3 arthropathies.

Preoperative integrity from both the deltoid and the subscapularis have been shown[19] [44] [45] [49] to be really important in order to achieve good outcomes, as forward elevation and shoulder stability respectively drastically decrease with their insufficiency.[16] [42] [50] [51] [52] However, we should notice that patients with concomitant subscapularis lesions limited only to its proximal insertion (but without subscapular dysfunction – that is negative lift-off sign) have been successfully treated since Gerber's initial publication.[16] [18] [47] [51]

Another likely predictor of worse postoperative outcomes and decreased active ER is preoperative atrophy and fatty infiltration (Goutallier 3 or higher) of the teres minor muscle.[47] [52] [53] Despite that, Moursy et al[52] noticed that even though patients with these findings fared worse overall, they were the ones with greater gain in postoperative ER; they concluded that this happened because preoperative degeneration of the teres minor muscle in all of their cases correlated with lesser preoperative active ER.[52]

Good preoperative shoulder movement is also essential, specifically passive forward flexion (FF) greater than 80°.[41] Furthermore, pseudoparetic shoulders (defined as active FF lower than 90°[54]) and previous surgical procedures have also been demonstrated to correlate with poorer outcomes.[18] [55] [56]

Different techniques for LDT transfer were also developed. Habermeyer et al[43] described a single-posterior-incision approach with a more posterior attachment site into the humeral head. Hertzberg et al[57] reported a similar technique, but instead, with a correction on the original site of insertion of the infraspinatus. However, the authors pointed that occasional proximal subscapularis lesions cannot be adequately treated through this approach. Nonetheless, Habermeyer et al[43] showed clinical results comparable to those of Gerber's two-incision method, with mean Constant-Murley scores improving from 46.5 points (29.3 to 66.7) preoperatively to 74.6 points (64.5 to 81.5) postoperatively.

Recently, there have been reports of arthroscopically-assisted transfers of this tendon.[31] [48] [58] [59] Grimberg and Kany[31] reported outcomes equivalent to those of historical open approaches, and this one-incision arthroscopically-assisted approach provided better mechanical resistance to traction due to the tubularized tendon fixation using two suture threads, resulting in a total of four suture ends for fixation.[60]

In 2019, Miyazaki et al[61] described a new technique for open LDT transfer. The authors claimed that the original technique has two main drawbacks that could predispose to complications and unsatisfactory functional results: 1) postoperative rupture of the origin of the deltoid, as its detachment from the acromion is necessary during the superior approach; and 2) postoperative rupture of the transfer. In an attempt to avoid these problems, they developed the following modifications. Through a deltopectoral approach, the LDT is detached from the humerus shaft, and is then reinforced and elongated with a tendinous allograft (calcaneus or quadricipital grafts), and finally transferred around the humerus and fixed to the superolateral aspect of the greater tuberosity. ([Fig. 4]) Nonetheless, no clinical results have been published so far.

We agree with the findings of Moursy et al[52] that it is difficult to assess the integrity of the transfer through magnetic resonance imaging (MRI). Regarding this matter, Kany et al[62] published in 2018 an interesting and insightful study. They evaluated 60 patients (after losing 6 patients to follow-up), with a mean postoperative follow-up of 35.2 months. The surgical technique in all of the patients involved placing three metallic markers distanced 2 cm, 4 cm and 6 cm from the tip of the tendon, therefore enabling an easy diagnosis of transfer ruptures with simple X-rays ([Figure 2]). The results showed 23 (38.6%) ruptures ([Figure 3]), which in itself was a major factor for worse postoperative functional results and satisfaction using 7 different functional and satisfaction scores (p < 0.05 in all of them).

Fig. 2 (A, B) Postoperative radiographs after a latissimus dorsi transfer with 3 metal markers (placed at 2 cm, 4 cm and 6 cm from the tip of the tendon). The asterisks indicate the metallic anchor from a previous (failed) rotator-cuff repair. (A) Anteroposterior view. (B) Scapular profile view.

Fig. 3 (A, B) Postoperative rupture of a latissimus dorsi tendon transfer. Note the increased distance between the intact first marker (1st) and the displaced second and third (2nd and 3rd) metal markers. The asterisks indicate metallic anchors from a previous (failed) rotator-cuff repair. Note that the calcified lesion in the proximal part of the humerus is an enchondroma, not at all related to the procedure or the rotator-cuff tear. (A) Anteroposterior view. (B) Scapular profile view.

Checchia et al[30] have hypothesized that the outcomes of LDT transfers would be determined not only by patient selection or concomitant subscapularis insufficiency, as mentioned by Gerber[16] and other authors,[19] [44] [45] but also by respecting five specific principles of tendon transfers:

1. Accurate positioning of the transferred tendon;

2. Physiological tensioning of the transferred muscle-tendon unit;

3. Strong bone fixation of the reimplanted tendon;

4. Minimally-invasive surgery to reduce muscle scarring (without hindering the excursion of the transfer);

5. A synergistic transfer.

1. The ideal fixation site probably varies according to the preoperative clinical presentation. According to Walch et al,[63] the clinical presentation of these patients is variable, especially regarding the drop sign (also known as Hornblower sign), which indicates deficiency of the external rotators. Painful, pseudoparetic shoulders with negative drop signs (described by Boileau et al[64] as a ‘painful loss of active elevation’), should be treated, according to Gerber et al,[17] with an over-the-top transfer. This means the tendon should be transferred above the joint's center of rotation in order to act mainly as a humeral-head depressor. For patients with isolated positive drop signs (described by Boileau et al[64] as ‘isolated loss of external rotation’), the aim should be the fixation lateral to the joint's center of rotation.[43] [57]

2. The second principle is to control the muscle-belly tension. One can reason that insufficient tension would lead to a non-effective transfer. Alternatively, excessive tension could damage the transferred muscle-tendon unit. It has been proposed[30] that, in order to obtain appropriate tension, before releasing the latissimus dorsi from its original attachment, one should place two landmarks on the muscle while the shoulder is in maximum abduction and ER (which is the position of maximal physiological tension of the latissimus dorsi). At the time of tendon reattachment, the muscle should be retensioned to match the prerelease distance between these two markers.

3. The third principle regards the mechanical resistance of tendon-to-bone fixation. Since the metaphyseal bone is fragile, a resistant fixation method should be used.[65] For open approaches, it is believed that transosseous sutures are strong enough, especially if augmented with some sort of cortical reinforcement, as suggested in an article by Gerber et al.[66]

   Arthroscopic techniques, however, require implants to achieve proper tendon-to-bone attachment. Diop et al[67] published a cadaveric biomechanical study that compared a standard anchor-fixation method (in a simple double-row manner) to a technique of fixation of the tubularized LDT to the greater tuberosity with an interference screw. They have shown that the latter presents higher biomechanical performance – in terms of stiffness, cyclic displacements and load to failure – despite resulting in more complications (especially greater tuberosity fracture during bone drilling).[67] For this reason, some authors[68] prefer fixation of the tubularized tendon with a cortical button positioned onto the bicipital groove, thereby avoiding drilling through the greater tuberosity.

   Another technique that improves tendon-to-bone healing involves removing cortical bony chips along with the LDT (by performing a delicate superficial osteotomy of the humeral cortex rather than a simple tenotomy). In fact, Moursy et al[52] have shown that this modification statistically results in fewer postoperative ruptures and better functional outcomes. Another possible alternative, as previously mentioned, is tendon reinforcement with the use of a tendinous allograft, as proposed by Miyazaki et al[61] ([Fig. 4]).

4. The fourth principle aims to limit the surgical trauma to the tissues. As far as we are aware, this is not supported by any empirical data, except for the findings by Warner and Parsons[56] of suboptimal results regarding revisions or multiple simultaneous tendon transfers. However, we can reason that less trauma may improve healing because it minimizes iatrogenic devascularization, and it may also enable greater tendon excursion, as less scarring of the surrounding soft tissues is generated. Furthermore, minimally-invasive techniques, as arthroscopic approaches, preserve the deltoid muscle belly, which is especially important to shoulder function in the setting of a rotator-cuff deficiency. Even though it has been shown that every step of the LDT transfer can be performed exclusively through an arthroscopic approach (Lafosse, Nice Shoulder Course, 2016, unpublished data), we believe that this should be avoided, once our experience has shown that failing to release the latissimus dorsi attachment to the apex of the scapula (which in our opinion cannot be performed arthroscopically) results in postoperative scapular winging.

5. It can also be argued that the LDT transfer does not respect the fifth principle of tendon transfer, because this muscle is not originally an agonist of both FF and ER, and its line of action is more inferior and more posterior than that of the original cuff tendons ([Figure 5]). Perhaps this is the main reason for the reported controversial and imperfect electromyographic results,[43] [47] [69] as well as for some of the reported unsatisfactory clinical results.[18] [70]

Fig. 4 (A-D) Latissimus dorsi tendon transfer elongated and reinforced with a tendinous allograft and performed through an isolated deltopectoral approach, as described by Miyazaki et al.[61] (A) Figure depicting tendon preparation before transfer. (B) Allograft preparation. (C) After passing the transfer behind the humerus. (D) Figure depicting final configuration of the latissimus dorsi tendon. Abbreviations: AG, allograft; TRI, triceps, LD, latissimus dorsi; RCT, rotator-Cuff Tear; LHB, long head of the biceps; TM, teres major; sub, subscapularis.

Fig. 5 (A-C) Drawings of the right shoulder. The line of pull from the lower trapezius (LT) more closely replicates the one from the infraspinatus (IS) than the one generated by the latissimus dorsi (LD). The line of pull from the LD closely replicates the line of pull from the subscapularis (SSCP). (A) Posterior view. (B) Anterior view. (C) Medial view.

Teres-Major-Tendon (TMT) Transfer

There are very few published studies regarding isolated TMT transfers for irreparable RCTs. All of them were performed in patients with isolated infraspinatus deficiency. The first series was reported in 1998 by Celli et al,[35] who achieved patient satisfaction and satisfactory functional results for all of their 6 patients. More recently, Celli et al,[34] published the long-term results of 20 patients with maintenance of the improved postoperative Constant-Murley scores.[34]

More recently, Henseler et al[36] published short-term results of TMT transfers. At two years of follow-up, the patients had significant (p < 0.05) improvements in ER, FF, and visual analogue scale and Constant-Murley scores. With a medium-term follow-up (mean of six years), Mansat et al[37] evaluated the results of 12 TMTs, showing results similar to those of Henseler et al.[36] Interestingly, the authors[37] could identify negative preoperative prognostic factors that included previous surgery and RCTs involving the subscapularis, as well as two positive prognostic factors: isolated involvement of the infraspinatus and of the functional teres minor. Furthermore, Mansat et al[37] described the following recommendations for TMT transfer: the patients should be under the age of 55 years, should have proper understanding of the lesion and the treatment, and should have intact subscapularis and anterior supraspinatus cable.

Lower-Trapezius-Tendon (LTT) Transfer

The double incision (a technique of prolonged LTT transfer with a tendinous autograft or allograft) has been recently investigated as an alternative to the LDT transfer for irreparable posterior RCTs and for chronic isolated musculotendinous tears of the infraspinatus.[33] [38] [39] [71] Besides probably being technically easier than the LDT transfer, the line of pull of the lower-trapezius-muscle fibers more closely replicates those of the infraspinatus ([Figure 5]). Furthermore, it has been shown that tension and excursion forces of the trapezius are very similar to those of the infraspinatus.[38] [39]

In a cadaveric study, Omid et al[39] concluded that the LTT transfer was biomechanically superior to the LDT transfer, providing greater ER forces. Hartzler et al[38] also found improved ER with the arm at the side compared to LDT transfer, but the LDT transfer was better at restoring the FF as well as the ER at 90° of abduction. More recently, in 2019, Reddy et al,[72] showed through a three-dimensional (3D) biomechanical virtual study (performing virtual LDT and LTT transfers in a computer software), that the LTT provided better abduction and ER moment arms when transferred to the infraspinatus insertion. However, LDT performed better when transferred to the supraspinatus insertion. Overall, the LTT transfer showed a biomechanical advantage compared with the LDT transfer because of stronger abduction moment arms.

In 2016, Elhassan et al,[71] were the first to report the outcomes following this technique. They evaluated 33 patients (26 men, with an average of 53 years of age; range: 31to 66 years) at an average follow-up of 47 months (range: 24 to 73 months). Except for one patient, who had a bone mass index of 36 kg/m², all achieved statistically significant improvements in pain, subjective shoulder value, and disabilities of the arm, shoulder and hand (DASH) score, as well as statistically significant improvements to all active shoulder motions. Their results were, therefore, the first to show that this mode of treatment may be a good alternative, at least at early and medium follow-up.

In 2016, Elhassan et al[73] described a modification to their original technique in which, instead of creating a second lateral open approach, they would instead fix the transfer to the greater tuberosity under arthroscopic visualization. Nonetheless, they haven't published the results following this modification. However, in 2018, Valenti and Werthel[74] published the results following almost the same technique as the one published by Elhassan et al,[73] the only difference being the use of a semitendinosus tendon autograft instead of an Achilles allograft. They evaluated 14 patients after a mean follow-up of 24 months (range 12 to 36 months). Their results have shown gain in external rotation with the arm at the side of 24° and, in 90° of abduction, of 40°. The lag sign and the Hornblower sign have disappeared from every patient in whom they were present preoperatively. The Constant-Murley score improved from 35 (preoperatively) to 60 points (postoperatively), the SST, from 3.5 to 7.5, the SSV, from 30 to 60%, and the pain decreased from 7 to 2 (visual analogue scale). There were two cases of hematomas, and one was revised because of infection.

We are unaware of any other published study showing the results of lower trapezius transfer for irreparable RCTs. Despite all that, to date there are no clinical studies that suggest the superiority of latissimus dorsi transfer or lower trapezius transfer over the other.

Conclusion

Irreparable posterosuperior RCTs can be debilitating, and failed cuff repairs are still challenging conditions to treat. Different techniques have been developed, and the proposed benefits of tendon transfers are pain relief and some increased range of motion with potential increase to shoulder strength. The LDT remains the most commonly used method, and different modifications to the original technique have been shown to minimize complications and to improve functional results and satisfaction. Nonetheless, LTT transfers are promising and should be considered, especially for patients with isolated loss of external rotation. Its results, however, are limited to two series of cases, both of which have reported only short to midterm follow-up.

^* Work developed at the Department of Orthopedics and Traumatology, Faculdade de Ciências Médicas, Santa Casa de São Paulo, Pavilhão “Fernandinho Simonsen”. Director: professor doctor Ivan Chakkour – São Paulo (SP), Brazil.

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Publikationsverlauf

Eingereicht: 07. Juli 2019

Angenommen: 10. Januar 2020

Artikel online veröffentlicht:
29. Mai 2020