Rotator cuff repair: the effect of double-row fixation on three-dimensional repair site

Outcome and structural integrity of rotator cuff after arthroscopic treatment of large and massive tears with double row technique: a 2-year followup

Purpose. The purpose of this study was to evaluate the functional outcome and the tendon healing after arthroscopic double row rotator cuff repair of large and massive rotator cuff tears. Methods. 82 patients with a full-thickness large and massive rotator cuff tear underwent arthroscopic repair with double row technique. Results were evaluated by use of the UCLA, ASES, and Constant questionnaires, the Shoulder Strength Index (SSI), and range of motion. Follow-up time was 2 years. Magnetic resonance imaging (MRI) studies were performed on each shoulder preoperatively and 2 years after repair. Results. 100% of the patients were followed up. UCLA, ASES, and Constant questionnaires showed significant improvement compared with preoperatively (P < 0.001). Range of motion and SSI in flexion, abduction, and internal and external rotation also showed significant improvement (P < 0.001). MRI studies showed 24 cases of tear after repair (29%). Only 8 cases were a full-thickness tear. Conclusions. At two years of followup, in large and massive rotator cuff tears, an arthroscopic double row rotator cuff repair technique produces an excellent functional outcome and structural integrity.

Arthroscopic single-row versus double-row rotator cuff repair: a meta-analysis of the randomized clinical trials

PURPOSE

The purpose of this meta-analysis was to critically assess whether there are differences in clinical outcomes between single-row and double-row rotator cuff repair in prospective randomized Level I studies.

METHODS

Using Medline, Scopus, Scirus, CINAHL (Cumulative Index to Nursing and Allied Health Literature), and the Cochrane Library, as well as a hand search, we searched for randomized prospective trials comparing single-row and double-row rotator cuff repair. The functional outcome scores included the American Shoulder and Elbow Surgeons shoulder scale, the Constant shoulder score, and the University of California, Los Angeles shoulder rating scale. A test of heterogeneity was performed to determine whether there was a difference across the included studies.

RESULTS

Five studies met our inclusion criteria. A test of heterogeneity showed no difference across these studies. The functional American Shoulder and Elbow Surgeons; Constant; and University of California, Los Angeles outcomes scores showed no difference between single- and double-row rotator cuff repair.

CONCLUSIONS

We found no significant differences in clinical outcomes between single-row and double-row rotator cuff repair in a meta-analysis of Level I studies.

LEVEL OF EVIDENCE

Level I, meta-analysis of Level I randomized controlled studies.

Rotator cuff repair in patients over 70 years of age

This study reports the clinical and sonographic outcome of arthroscopic rotator cuff repair in patients aged ≥ 70 years and aimed to determine factors associated with re-tear. A total of 69 consecutive repairs were performed in 68 patients with a mean age of 77 years (70 to 86). Constant-Murley scores were collected pre-operatively and at one year post-operatively. The integrity of the repair was assessed using ultrasound. Re-tear was detected in 20 of 62 patients (32%) assessed with ultrasound. Age at operation was significantly associated with re-tear free survival (p = 0.016). The mean pre-operative Constant score was 23 (sd 14), which increased to 58 (sd 20) at one year post-operatively (paired t-test, p < 0.001). Male gender was significantly associated with a higher score at one year (p = 0.019).

We conclude that arthroscopic rotator cuff repair in patients aged ≥ 70 years is a successful procedure. The gender and age of the patient are important factors to consider when planning management.

Cite this article: Bone Joint J 2013;95-B:199–205.

The effects of low-intensity pulsed ultrasound on tendon-bone healing in a transosseous-equivalent sheep rotator cuff model

PURPOSE

The purpose of this study was to examine the effects Low-intensity Pulsed Ultrasound has on initial tendon-bone healing in a clinically relevant extra-articular transosseous-equivalent ovine rotator cuff model.

METHODS

Eight skeletally mature wethers, randomly allocated to either control group (n = 4) or treatment group (n = 4), underwent rotator cuff surgery following injury to the infraspinatus tendon. All animals were killed 28 days post surgery to allow examination of early effects of Low-intensity Pulsed Ultrasound treatment.

RESULTS

General improvement in histological appearance of tendon-bone integration was noted in the treatment group. Newly formed woven bone with increased osteoblast activity along the bone surface was evident. A continuum was observed between the tendon and bone in an interdigitated fashion with Sharpey's fibres noted in the treatment group. Low-intensity Pulsed Ultrasound treatment also increased bone mineral density at the tendon-bone interface (p < 0.01), while immunohistochemistry results revealed an increase in the protein expression patterns of VEGF (p = 0.038), RUNX2 (p = 0.02) and Smad4 (p = 0.05).

CONCLUSIONS

The results of this study indicate that Low-intensity Pulsed Ultrasound may aid in the initial phase of tendon-bone healing process in patients who have undergone rotator cuff repair. This treatment may also be beneficial following other types of reconstructive surgeries involving the tendon-bone interface.

Arthroscopic rotator cuff repair: techniques in 2012

Techniques for arthroscopic partial-thickness and full-thickness RTC repairs continue to advance. When selecting an RTC repair technique, it is important to identify the tear pattern and adhere to the fundamentals of tendon mobilization and footprint preparation. Partial RTC tears greater than 50% in thickness can be reproducibly repaired with tear completion or transtendinous techniques with good clinical outcomes. Based on the available literature, small, less than 1-cm RTC tears can effectively be repaired with single-row techniques. Tears sized 1 cm to 3 cm can be repaired with either single-row, double-row, or transosseous-equivalent techniques based on surgeon comfort, tendon quality, and tissue mobility. Tears greater than 3 cm have shown superior results when transosseous-equivalent techniques are used. Further clinical studies are needed to definitively conclude the ideal RTC repair technique.

Restoration of shoulder biomechanics according to degree of repair completion in a cadaveric model of massive rotator cuff tear: importance of margin convergence and posterior cuff fixation

BACKGROUND

Complete repair in massive rotator cuff tear may not be possible, allowing for only partial repair. However, the effect of partial repair on glenohumeral biomechanics has not been evaluated. Therefore, the purpose of this study was to compare the rotational range of motion (ROM), glenohumeral kinematics, and gap formation at the repaired tendon edge following massive cuff tear and repair according to the degree of repair completion.

HYPOTHESIS

Posterior fixation will restore the altered biomechanics of massive rotator cuff tear.

STUDY DESIGN

Controlled laboratory study.

METHODS

Eight cadaveric shoulders were tested at 0°, 30°, and 60° of abduction in the scapular plane. Muscle loading was applied based on physiological muscle cross-sectional area ratios. Maximum internal (MaxIR) and external rotations (MaxER) were measured. Humeral head apex (HHA) position and gap formation at the repaired tendon edge were measured using a MicroScribe from MaxIR to MaxER in 30° increments. Testing was performed for intact, massive cuff tear, complete repair, and 4 types of partial repair. A repeated-measures analysis of variance was used to determine significant differences.

RESULTS

Massive tear significantly increased ROM and shifted HHA superiorly in MaxIR at all abduction angles (P < .05). The complete repair restored ROM to intact (P < .05), while all partial repairs did not. Abnormal HHA elevation due to massive tear was restored by all repairs (P < .05). Release of the anterior single row alone and release of the marginal convergence significantly increased gap formation at the anterior tendon edge (P < .05).

CONCLUSION

This study emphasizes the importance of anterior fixation in massive cuff tear to restore rotational range of motion and decrease gap formation at the repaired tendon edge and of posterior fixation to restore abnormal glenohumeral kinematics due to massive cuff tear.

CLINICAL RELEVANCE

If complete repair of massive cuff tear is not possible, posterior cuff (infraspinatus) repair is necessary to restore abnormal glenohumeral kinematics, and margin convergence anteriorly is recommended to decrease gap formation of the repaired tendon edge, which may provide a better biomechanical environment for healing.

The failure mode of two reabsorbable fixation systems: Swivelock with Fibertape versus Bio-Corkscrew with Fiberwire in bovine rotator cuff

BACKGROUND

Despite technical advances in rotator cuff surgery, recurrent or persistent defects in the repaired tendon continue to occur. The improved strength of sutures and suture anchors has shown that the most common site of failure is the suture-tendon interface. The purpose of this study was to compare two different types of repair under both cyclic and load-to-failure conditions. The hypothesis is that the use of a fixation system with knotless anchor and taped suture results in better biomechanical performance, under both cyclic and load-to-failure conditions.

METHODS

Thirty bovine shoulder specimens were randomly assigned to two group tests: the Swivelock 5-mm anchor with Fibertape (Group A) and the Bio-Corkscrew 5 mm with Fiberwire (Group B). We simulated the reconstruction of a rotator cuff tear with a single-row technique, performing a tenodesis with types A and B fixation. Each specimen underwent cyclic testing from 5 to 30 N for 30 cycles, followed by load-to-failure testing, in order to calculate the ultimate failure load (UFL).

RESULTS

Load-to-failure tests revealed a significantly higher UFL in Group A than in Group B. Wire fixing failed at the anchor loop whereas tape fixing failed at the sutures, suture-tendon interface, and anchors. Cyclic testing revealed no significantly greater slippage between the two groups. Stiffness values were not statistically significantly different. In all cases, tendons remained intact until the end of the cyclic testing.

CONCLUSIONS

The tape structure is biomechanically stronger than the wire structure.

Meta-analysis of Clinical and Radiographic Outcomes After Arthroscopic Single-Row Versus Double-Row Rotator Cuff Repair

Context:

Double-row rotator cuff repair methods have improved biomechanical performance when compared with single-row repairs.

Objective:

To review clinical outcomes of single-row versus double-row rotator cuff repair with the hypothesis that double-row rotator cuff repair will result in better clinical and radiographic outcomes.

Data Sources:

Published literature from January 1980 to April 2010. Key terms included rotator cuff, prospective studies, outcomes, and suture techniques.

Study Selection:

The literature was systematically searched, and 5 level I and II studies were found comparing clinical outcomes of single-row and double-row rotator cuff repair. Coleman methodology scores were calculated for each article.

Data Extraction:

Meta-analysis was performed, with treatment effect between single row and double row for clinical outcomes and with odds ratios for radiographic results. The sample size necessary to detect a given difference in clinical outcome between the 2 methods was calculated.

Results:

Three level I studies had Coleman scores of 80, 74, and 81, and two level II studies had scores of 78 and 73. There were 156 patients with single-row repairs and 147 patients with double-row repairs, both with an average follow-up of 23 months (range, 12-40 months). Double-row repairs resulted in a greater treatment effect for each validated outcome measure in 4 studies, but the differences were not clinically or statistically significant (range, 0.4-2.2 points; 95% confidence interval, –0.19, 4.68 points). Double-row repairs had better radiographic results, but the differences were also not statistically significant (P = 0.13). Two studies had adequate power to detect a 10-point difference between repair methods using the Constant score, and 1 study had power to detect a 5-point difference using the UCLA (University of California, Los Angeles) score.

Conclusions:

Double-row rotator cuff repair does not show a statistically significant improvement in clinical outcome or radiographic healing with short-term follow-up.

Single-row versus double-row repair of the distal Achilles tendon: a biomechanical comparison

Surgery for recalcitrant insertional Achilles tendinopathy often consists of partial or total release of the insertion site, debridement of the diseased portion of the tendon, calcaneal ostectomy, and reattachment of the Achilles to the calcaneus. Although single-row and double-row techniques exist for repair of the detached Achilles tendon, biomechanical data are lacking to support one technique over the other. Based on data extrapolated from the study of rotator cuff repairs, we hypothesized that a double-row construct would provide superior fixation strength over a single-row repair. Eighteen human cadaveric Achilles tendons (9 matched pairs) with attached calcanei were repaired with single-row or double-row techniques. Specimens were mounted in a servohydraulic materials testing machine, subjected to a preconditioning cycle, and loaded to failure. Failure was defined as suture breakage or pullout, midsubstance tendon rupture, or anchor pullout. Among the failures were 12 suture failures, 5 proximal-row anchor failures, and 1 distal-row anchor failure. No midsubstance tendon ruptures or testing apparatus failures were observed. There were no statistically significant differences in the peak load to failure between the single-row and double-row repairs (p = .46). Similarly, no significant differences were observed with regards to mean energy expenditure to failure (p = .069). The present study demonstrated no biomechanical advantages of the double-row repair over a single-row repair. Despite the lack of a clear biomechanical advantage, there may exist clinical advantages of a double-row repair, such as reduction in knot prominence and restoration of the Achilles footprint.

Use of platelet-leukocyte membrane in arthroscopic repair of large rotator cuff tears: a prospective randomized study

BACKGROUND

Arthroscopic rotator cuff repair generally provides satisfactory results including decreased shoulder pain and improved shoulder motion. Unfortunately, imaging studies demonstrate that the retear rate associated with the available arthroscopic techniques may be high. The purpose of this study was to evaluate the clinical and magnetic resonance imaging (MRI) results of arthroscopic rotator cuff repair with and without the use of platelet-leukocyte membrane in patients with a large posterosuperior rotator cuff tear.

METHODS

Eighty consecutive patients with a large full-thickness posterosuperior rotator cuff tear were enrolled. All tears were repaired using an arthroscopic single-row technique. Patients were randomized to treatment either with or without a platelet-leukocyte membrane inserted between the rotator cuff tendon and its footprint. In patients treated with this membrane, one membrane was utilized for each suture anchor. The primary outcomes were the difference between the preoperative and postoperative Constant scores and the repair integrity assessed by MRI according to the Sugaya classification. The secondary outcome was the difference between the preoperative and postoperative Simple Shoulder Test (SST) scores.

RESULTS

The only significant differences between the two groups involved the patient age and the preoperative and postoperative Constant scores; the differences in the Constant score were due to differences in the shoulder pain subscore. At a mean of thirteen months of follow-up, rotator cuff retears were observed only in the group of patients in whom the membrane had not been used, and a thin but intact tendon was observed more frequently in this group as well. The use of the membrane was associated with significantly better repair integrity (p = 0.04).

CONCLUSIONS

The use of the platelet-leukocyte membrane in the treatment of rotator cuff tears improved repair integrity compared with repair without membrane. However, the improvement in repair integrity was not associated with greater improvement in the functional outcome. In fact, the Constant scores of the two groups would have been similar if the shoulder pain component (which had differed preoperatively) had been excluded.

Suture number determines strength of rotator cuff repair

BACKGROUND

Failure of surgical repair of a rotator cuff tear continues to be a clinical problem. For other tendon repairs, increasing the number of sutures improves both biomechanical performance and clinical outcomes. Several investigators have shown biomechanical advantages of double-row techniques but have used many more sutures than were used with the single-row techniques with which the double-row techniques were compared. The purposes of our study were to establish whether using a greater number of sutures would improve the biomechanical properties of a rotator cuff repair model, and whether using equal numbers of sutures would lead to equivalent results between single and double-row configurations.

METHODS

Fresh-frozen sheep infraspinatus tendons underwent single-row repair with two, four, or six mattress sutures and double-row repair with use of four mattress sutures. Specimens were pretensioned at 10 N for one minute, then cycled from 10 to 180 N for 200 cycles at 0.2 Hz; this was followed by load to failure. Cyclic gap formation, failure load, and failure type were recorded.

RESULTS

The four-suture single-row and four-suture double-row repairs had similar gap formation during cyclic testing, with no significant differences between them. Cyclic gap formation in the two-suture single-row group was 6.7 and 7.1 mm (97% and 109%) greater than that in the four and six-suture single-row groups after 200 cycles (p &lt; 0.001). The average loads to failure of the two, four, and six-suture single-row groups were 274, 362, and 572 N (p &lt; 0.0001). The average load to failure of the four-suture double-row group was 386 N, which was similar to the value in the four-suture single-row group (p = 0.58).

CONCLUSIONS

In an ovine rotator cuff tendon repair model, increasing the number of sutures decreased cyclic gap formation and increased load to failure. Single and double-row repairs are biomechanically equivalent when the number of sutures is kept constant.

CLINICAL RELEVANCE

The results of this study support the use of greater numbers of sutures in rotator cuff repair and disagree with the assertion that double-row repairs are biomechanically superior to single-row repairs.

Tissue anchor use in arthroscopic glenohumeral surgery

Arthroscopic surgery has become the mainstay of treatment of several common glenohumeral pathologies such as tears of the rotator cuff and labrum. Arthroscopic rotator cuff and labral repair provide outcomes comparable to those achieved with traditional open techniques, with the benefits of smaller incisions and less soft-tissue disruption. Development and improvement of tissue anchors and arthroscopic instrumentation has been integral to the increased popularity of arthroscopic glenohumeral repairs. Current anchors can be categorized by design and material composition. Awareness of the advantages and limitations of these implants may influence anchor selection.

Long-term outcome of arthroscopic massive rotator cuff repair: the importance of double-row fixation

PURPOSE

The purpose of this study was to (1) evaluate the long-term functional outcome of arthroscopic rotator cuff repair of massive rotator cuff tears (RCTs) and (2) compare double-row (DR) and single-row (SR) repairs.

METHODS

This was a retrospective review of massive RCTs treated with an arthroscopic rotator cuff repair over an 8-year period. Minimum 5-year follow-up was available for 126 repairs at a mean of 99 months. Among 107 complete repairs, there were 62 SR and 45 DR repairs. Functional outcome was determined by University of California, Los Angeles (UCLA) and American Shoulder and Elbow Surgeons scores. A multivariate analysis was performed to examine the role of a DR repair.

RESULTS

For all repairs combined, improvements were observed in forward flexion (132° v 168°), pain (6.3 v 1.3), UCLA score (15.7 v 30.7), and American Shoulder and Elbow Surgeons score (41.7 v 85.7) (P < .001). A good or excellent outcome, obtained in 78% of cases, was associated with a complete repair (P = .035) and a DR repair (P = .008). When we excluded partial repairs, postoperative UCLA gain was greater after a DR repair (P = .007). Patients reported their shoulder as feeling closer to normal after a DR repair compared with an SR repair (93.5% v 84.4%, P = .006). A DR repair was 4.9 times more likely to lead to a good or excellent outcome (P = .021).

CONCLUSIONS

When a DR repair of a massive RCT is possible, on the basis of the ability to mobilize the tendons, a better long-term functional outcome can be expected compared with an SR repair. Given the known high risk of recurrence after repair of massive RCTs and the knowledge that functional outcome is related to recurrence, a DR repair of massive RCTs should be performed when there is sufficient tendon mobility.

Does double-row rotator cuff repair improve functional outcome of patients compared with single-row technique? A systematic review

BACKGROUND

The advantage of single-row versus double-row arthroscopic rotator cuff repair techniques has been a controversial issue in sports medicine and shoulder surgery. There is biomechanical evidence that double-row techniques are superior to single-row techniques; however, there is no clinical evidence that the double-row technique provides an improved functional outcome.

HYPOTHESIS

When compared with single-row rotator cuff repair, double-row fixation, although biomechanically superior, has no clinical benefit with respect to retear rate or improved functional outcome.

STUDY DESIGN

Systematic review.

METHODS

The authors reviewed prospective studies of level I or II clinical evidence that compared the efficacy of single- and double-row rotator cuff repairs. Functional outcome scores included the American Shoulder and Elbow Surgeons (ASES) shoulder scale, the Constant shoulder score, and the University of California, Los Angeles (UCLA) shoulder rating scale. Radiographic failures and complications were also analyzed. A test of heterogeneity for patient demographics was also performed to determine if there were differences in the patient profiles across the included studies.

RESULTS

Seven studies fulfilled our inclusion criteria. The test of heterogeneity across these studies showed no differences. The functional ASES, Constant, and UCLA outcome scores revealed no difference between single- and double-row rotator cuff repairs. The total retear rate, which included both complete and partial retears, was 43.1% for the single-row repair and 27.2% for the double-row repair (P = .057), representing a trend toward higher failures in the single-row group.

CONCLUSION

Through a comprehensive literature search and meta-analysis of current arthroscopic rotator cuff repairs, we found that the single-row repairs did not differ from the double-row repairs in functional outcome scores. The double-row repairs revealed a trend toward a lower radiographic proven retear rate, although the data did not reach statistical significance. There may be a concerning trend toward higher retear rates in patients undergoing a single-row repair, but further studies are required.

Repair integrity and functional outcomes after arthroscopic suture-bridge rotator cuff repair

BACKGROUND

We evaluated the clinical and imaging outcomes of arthroscopic suture-bridge repair of full-thickness rotator cuff tears.

METHODS

From May 2007 to April 2008, seventy-nine patients with a full-thickness rotator cuff tear consecutively underwent arthroscopic suture-bridge repair. The mean age of the patients was 58.3 years (range, thirty-eight to seventy-eight years), and the mean duration of follow-up was 30.6 months (range, twenty-four to forty-four months). Seventy-three patients underwent postoperative ultrasonography or magnetic resonance imaging; seventy-one underwent the imaging at a minimum of two years postoperatively, and the remaining two did so after the operation because of persistent symptoms. The clinical results of seventy-seven patients (all except two who had undergone revision) were evaluated at a minimum of two years postoperatively. University of California at Los Angeles (UCLA), American Shoulder and Elbow Surgeons (ASES), and Constant-Murley scores were used for clinical and functional evaluations before surgery and at the time of final follow-up.

RESULTS

The imaging follow-up rate was 92%, and the follow-up rate for clinical evaluation was 100%. The re-tear rate after suture-bridge repair was 15%. The re-tear rate of the medium, large, and massive tears (as classified according to the anterior-to-posterior diameter of the tear) was 12%, 21%, and 22%, respectively. Massive and large tears tended to show a higher re-tear rate than did medium tears, but the difference was not significant (p = 0.417 and p = 0.964, respectively). The mean UCLA, ASES, and Constant-Murley scores improved from 21.6, 50.4, and 52.7 preoperatively to 30.9, 86.2, and 74.7 at the time of final follow-up (p < 0.001). However, the clinical outcomes after the operation did not differ significantly between the patients who had healing of the tear and those who did not (p = 0.438, p = 0.625, and p = 0.898 for the UCLA, ASES, and Constant-Murley scores, respectively).

CONCLUSIONS

Arthroscopic suture-bridge repair of full-thickness rotator cuff tears was followed by a re-tear rate of 15% as seen with imaging and resulted in significant improvement of functional outcomes and clinical results compared with the preoperative findings.

Double row repair: is it worth the hassle?

In the operative management of rotator cuff disease, comparable functional results have been reported after open or mini-open repair and arthroscopic fixation. Surgical repair aims to re-establish an anatomical configuration of the tendon-bone construct for restoring its mechanical performance. Single row repair is the most commonly used technique, but recently some authors have proposed to re-establish the rotator cuff footprint with 2 rows of suture anchors ("double row" repair). In regard to imaging assessment, at time zero double row repair results being more anatomic and allows for structurally sound restoration of the rotator cuff footprint. However, this does not seem to translate into superior clinical outcomes for the double row repair when evaluating all different sizes of rotator cuff tears as a whole. The scientific basis for recommending single or double row repair as preferred treatment for patients with rotator cuff tear is questionable, as minimal differences have been measured on clinical and functional rating scales.

Arthroscopic rotator cuff repair: suture anchor properties, modes of failure and technical considerations

Rotator cuff injury and tears are a common source of shoulder pain, particularly among the elderly. Arthroscopic repair has now become the mainstay in the treatment of significant injuries that have failed conservative therapy. Compared with the traditional open technique, arthroscopic repair offers patients smaller incisions and less soft-tissue trauma, which result in improved postoperative pain and rehabilitation. The advances that have made arthroscopic repairs a reality includes improvement in arthroscopic rotator cuff instrumentation, particularly suture anchors. Suture anchors are used to reattach the torn rotator cuff tissue back onto the bone. Current rotator cuff anchors vary by design, anchor composition and suture materials. A treating physician should be aware of the advantages and limitations of these implants, which may influence the choice of one anchor over another. In addition to anchor variables, other factors that may affect the success of the repair include the local environment and surgical technique. In this article, various aspects of anchor design will be discussed. In addition, a concise review of technical considerations will also be discussed.

Surgery of subacromial syndrome with application of plasma rich in growth factors

Background

Our objective was to evaluate clinical recovery of patients with subacromial syndrome, after administering them plasma rich in growth factors (PRGF) by means of the Constant, University of California Los Angeles (UCLA) and Dissabilities of Arm, Shoulder and Hand (DASH) tests.

Materials and Methods

Prospective cohort study involving two groups — group A, treated with PRGF (52 patients); and group B, without PRGF treatment (79 patients). We analyzed the clinical situation preoperatively (time 1), at 1 month (time 2) and after rehabilitation (time 3).

Results

We considered 131 patients (71.2% were men, with median age of 53.7 years). Different approaches were used — traditional (62.5%), mini-open (22.5%) and arthroscopic (15%), without significant differences (P= .71). We observed improvement in the Constant test results at time 2 (59.8 ± 11.5 points in group A vs. 13.2 ± 7.1 points in group B; P < .05) and at time 3 (79.3 ± 11.6 points in group A vs. 59.7 ± 20.1 points in group B; P ¼ .05). We found improvement in the UCLA test results at time 2 (23.2 ± 5.8 points in group A vs. 4.72 ± 1.1 points in group B; P < .05) and at time 3 (32.1 ± 5.3 points in group A vs. 22.1 ± 7.35 points in group B; P < .05). We also observed improvement in the DASH test results at time 2 (45.2 ± 17.2 points in group A vs. 118.3 ± 7.6 points in group B, P < .05) and at time 3 (37.3 ± 12.6 points in group A vs. 69 ± 25.7 points in group B). Time of rehabilitation reduced significantly: 2.53 months in group A vs. 4.96 months in group B (P < .05). No significant differences were observed in surgical times: 88 minutes (group A) vs. 97 minutes (group B).

Conclusion

In our experience, PRGF should be indicated in subacromial syndrome and cuff involvement, as shown by the improvement in our results in terms of better results of tests, reduction in rehabilitation time and no increase in operation time.

Single-row repair versus double-row repair of full-thickness rotator cuff tears

PURPOSE

The purpose of this meta-analysis was to assess whether there are differences in the outcomes between single-row and double-row rotator cuff repair.

METHODS

Using MEDLINE, SCOPUS, SCIRUS, CINAHL, and the Cochrane Library, as well as a hand search, we searched for articles comparing single-row and double-row rotator cuff repair that were published before September 2009. The controlled clinical studies that met the inclusion and exclusion criteria were assessed for quality of methodology. Two of the authors performed this review and assessment. Any disagreements were resolved by the third author.

RESULTS

Three randomized controlled studies and two controlled clinical cohort studies were included in this meta-analysis. These studies were assessed as having a moderate to high level of evidence. The results showed that double-row repair improved tendon healing and provided greater external rotation but with significantly increased operative time. Furthermore, this study found that double-row repair decreased the recurrence rate. However, there were no statistically significant differences found in shoulder function as assessed by Constant score; American Shoulder and Elbow Surgeons (ASES) score; University of California, Los Angeles (UCLA) score; Western Ontario Rotator Cuff (WORC) index; Disabilities of the Arm, Shoulder and Hand (DASH) score; muscle strength; forward flexion; internal rotation; patient satisfaction; return to work; and adverse events.

CONCLUSIONS

Despite the fact that double-row repair shows a significantly higher rate of tendon healing and greater external rotation than does single-row repair, there is no significant improvement in shoulder function, muscle strength, forward flexion, internal rotation, patient satisfaction, or return to work.

LEVEL OF EVIDENCE

Level II, meta-analysis of Level I and Level II studies.

Early structural and functional outcomes for arthroscopic double-row transosseous-equivalent rotator cuff repair

BACKGROUND

The arthroscopic double-row transosseous-equivalent (TOE) rotator cuff repair is growing in popularity. The current body of literature supports this technique; however, the number of patients in these studies is relatively small. The authors conducted this study to learn more about the natural history of this construct in a large sample of patients.

HYPOTHESIS

The double-row TOE rotator cuff repair will have an acceptable structural failure rate with improved clinical outcomes at 1-year follow-up.

STUDY DESIGN

Case series; Level of evidence, 4.

METHODS

Between June 2006 and October 2007, 225 patients underwent an all-arthroscopic rotator cuff repair at 2 surgical centers. A total of 155 TOE primary rotator cuff repairs were performed, and 154 of these patients met the inclusion criteria. Assessment of structural integrity was based on evaluation of postoperative magnetic resonance imaging or computed tomography arthrogram at a minimum of 12 months after surgery. The Constant scores, visual analog pain scale, range of motion, strength, and complications were the clinical outcomes analyzed for the study. Seventeen patients (of 154) had postoperative shoulder stiffness at follow-up.

RESULTS

The 154 patients were clinically and radiologically evaluated at a mean of 15 months postoperatively (range, 12-26.1 months). The study included 47 small (30.5%), 89 large (57.1%), and 19 massive (12.3%) rotator cuff tears. Analysis of postoperative imaging demonstrated that 92%, 83%, and 84% of the small, large, and massive rotator cuff tears, respectively, were intact. The mean Constant score improved from 44.42 points preoperatively to 80.47 points postoperatively (P < .001). The mean preoperative pain score improved from 3.83 to 12.77 (P < .001) postoperatively. The mean forward flexion improved from 123.06° preoperatively to 162.39° postoperatively (P < .001). Seventeen patients (of 154) had postoperative shoulder stiffness at follow-up.

CONCLUSION

The short-term results of this study indicate that the clinical outcomes and structural integrity of TOE double-row rotator cuff repair (the suture-bridge technique) have results that compare favorably with those reported for other double-row suture anchor techniques employed in rotator cuff repairs. Long-term follow-up will be necessary to determine if the durability of these repairs and the structural integrity of these constructs maintain their performance over time.

Single versus double-row repair of the rotator cuff: does double-row repair with improved anatomical and biomechanical characteristics lead to better clinical outcome?

PURPOSE

Several techniques for arthroscopic repair of rotator cuff defects have been introduced over the past years. Besides established techniques such as single-row repairs, new techniques such as double-row reconstructions have gained increasing interest. The present article therefore provides an overview of the currently available literature on both repair techniques with respect to several anatomical, biomechanical, clinical and structural endpoints.

METHODS

Systematic literature review of biomechanical, clinical and radiographic studies investigating or comparing single- and double-row techniques. These results were evaluated and compared to provide an overview on benefits and drawbacks of the respective repair type.

RESULTS

Reconstructions of the tendon-to-bone unit for full-thickness tears in either single- or double-row technique differ with respect to several endpoints. Double-row repair techniques provide more anatomical reconstructions of the footprint and superior initial biomechanical characteristics when compared to single-row repair. With regard to clinical results, no significant differences were found while radiological data suggest a better structural tendon integrity following double-row fixation.

CONCLUSION

Presently published clinical studies cannot emphasize a clearly superior technique at this time. Available biomechanical studies are in favour of double-row repair. Radiographic studies suggest a beneficial effect of double-row reconstruction on structural integrity of the reattached tendon or reduced recurrent defect rates, respectively.

Comparison of mechanical stability in double-row rotator cuff repairs between a knotless transtendon construct versus the addition of medial knots

PURPOSE

Our purpose was to investigate the importance of medial-row knot tying to mechanical stability in a double-row rotator cuff repair by comparing a knotless construct with transtendon anchor passage versus a similar construct implementing medial knots.

METHODS

A standard defect was created in the infraspinatus tendons of 14 bovine humeri. All defects were repaired with 2 medial and 2 lateral anchors (SutureCross System; KFx Medical, Carlsbad, CA). The medial anchors were either placed by transtendon passage in a knotless construct or placed directly into bone with needle passage of suture to create bursal-sided knots medially. Constructs were subjected to a cyclic loading protocol and then loaded to failure.

RESULTS

The medially knotted constructs had a statistically higher stiffness at both the initial and final cycles (P < .001 and P < .001, respectively) and a lower displacement during cyclic loading (P < .02). There were strong trends toward decreased gauge displacement (P = .12) and decreased cycles to 3 mm of displacement (P = .07) in the medially knotted group. Maximal yield strength was greater in the medially knotted group (350 +/- 270 N v 650 +/- 530 N), although this was not found to be statistically significant (P = .5).

CONCLUSIONS

Our data suggest that creation of medial knots increases construct stiffness and stability in arthroscopic double-row cuff repair. This is likely because of increased load transfer to the lateral anchor and suture-tendon interface in the knotless construct.

CLINICAL RELEVANCE

Medial knots create increased mechanical stability that theoretically may improve rotator cuff healing. This mechanical advantage must be weighed against surgical efficiency, with consideration given to factors such as tissue quality.

Three-dimensional evaluation of the cyclic loading behavior of different rotator cuff reconstructions

PURPOSE

To perform a biomechanical comparison of single-row rotator cuff repairs with modified suture configurations versus double-row repairs using radiostereometric analysis (RSA).

METHODS

The infraspinatus tendon and the humerus of 40 porcine cadaveric shoulders were marked with tantalum beads and placed in an RSA calibration cage that allows for calculation of 3-dimensional positions of the tantalum markers. The intact tendon was cyclically loaded (50 cycles/20 N). After sharp dissection of the infraspinatus from the bone, the repairs were made by use of 3 single-row (modified Mason-Allen, double mattress, inclined mattress) and 2 double-row (modified Mason-Allen, suture bridge) configurations. The reconstructions were cyclically loaded for 50 cycles (10 N to 40, 60, 80, and 100 N). Displacements under cyclic loading were quantified in the anteroposterior (x), craniocaudal (y), and mediolateral (z) direction. The craniocaudal measurements were compared with the results of a video extensometer.

RESULTS

Cyclic loading of the intact tendon showed a mean displacement of 0.06 +/- 0.08 mm at the x-level, 0.16 +/- 0.18 mm at the y-level, and 0.19 +/- 0.28 mm at the z-level. High correlations between the RSA and the video extensometer measurements were found (0.87). Comparison of rotator cuff repairs showed significant differences in gap formation at 40, 60, 80, and 100 N in the craniocaudal plane (P < .0001) and the mediolateral plane (P <or= .05), with the double-row Mason-Allen repair providing the lowest gap formation of all tested configurations. However, these results were not statistically significant compared with the single-row double-mattress repair. No significant differences were measured at the anteroposterior level (P > .05).

CONCLUSIONS

Single-row repairs using modified Mason-Allen or double-mattress repair were able to achieve biomechanical results comparable to double-row repairs as measured by RSA and digital video.

CLINICAL RELEVANCE

Single-row repairs, using modified suture configurations, were able to decrease implant costs compared with double-row repairs, by achieving comparable results. Furthermore, RSA gives additional information on the applied forces acting on the rotator cuff repair in 3 different planes, which may help to decrease the rerupture rate of rotator cuff reconstructions.

Massive tears of the rotator cuff

Repair of massive rotator cuff tears is technically difficult but often feasible. Technical and biological challenges to a successful repair include inelastic poor-quality tendon tissue, scarring, muscle atrophy, and fatty infiltration. Fatty infiltration of the involved rotator cuff muscles has been identified as an important negative prognostic factor for the outcome after repair of massive rotator cuff tears. Tendon transfer is a good option for young patients and manual laborers with an irreparable massive rotator cuff tear. Arthroplasty can be considered for the treatment of symptomatic massive rotator cuff tears in patients who have glenohumeral arthritis.

Internal impingement: a review on a common cause of shoulder pain in throwers

Internal impingement is a term used to describe the pathologic contact of the undersurface of the rotator cuff with the glenoid. It typically occurs in overhead athletes, particularly throwers. In these athletes, the bones and soft tissues adapt to allow these athletes to have a supraphysiologic range of motion. In many athletes, these changes may lead to symptoms of internal impingement. This article discusses the background, biomechanics, pathophysiology, clinical and radiographic assessment, treatments, and outcomes of this disorder.

Biomechanical comparison of transosseous versus suture anchor repair of the subscapularis tendon

PURPOSE

The purpose of this study was to compare the biomechanical properties of transosseous versus suture anchor repair of the subscapularis tendon. We also performed real-time measurement of contact area and pressure of the repair site under rotational loads.

METHODS

Six paired human cadaveric shoulders were subjected to rotational loading after repair of the subscapularis tendon. Both shoulders were randomized to transosseous or suture anchor repairs. Real-time pressure sensors were placed between the subscapularis tendon and lesser tuberosity. The repair was subjected to cyclical rotational loading and load-to-failure testing.

RESULTS

No significant difference was detected in initial pressurized contact area between transosseous repairs (1.70 +/- 0.99 cm(2), 57.88 +/- 30.02% footprint) and suture anchor repairs (1.08 +/- 0.58 cm(2), 34.26% +/- 17.32% footprint). Under cyclical loading, the conditioning elongation of transosseous repairs (0.64 +/- 0.40 mm) was significantly lower (P < .05) than that of suture anchor repairs (2.38 +/- 1.58 mm). No significant difference was found in mean pressurized contact area between the transosseous repairs (2.72 +/- 1.25 cm(2), 94.2% +/- 37.4% footprint) and suture anchor repairs (2.01 +/- 0.89 cm(2), 65.9% +/- 27.9% footprint). For suture anchor repairs, repair-site contact area was significantly (P < .05) smaller than the area of corresponding native insertional footprints; for transosseous repairs, no significant difference was detected. There were no significant differences in peak pressures between the 2 repairs. In the load-to-failure tensile test, there was no significant difference between transosseous repairs (453.2 +/- 66.1 N) and suture anchor repairs (392.6 +/- 78.0 N).

CONCLUSIONS

Transosseous and suture anchor repairs of the subscapularis tendon have comparable biomechanical properties. Despite increased conditioning elongation in suture anchor repairs, we found no significant differences in mean contact area between the 2 repairs under cyclical loading. The suture anchor repairs do have a smaller contact area than the native insertional area. Real-time pressure and contact area measurements enabled mapping of the repair site throughout cyclical loading.

CLINICAL RELEVANCE

Rotational loading of the subscapularis tendon may provide a more accurate representation of subscapularis tendon injuries. Both techniques showed adequate repair strength; however, neither surgical technique exhibited normal insertional behavior in this time-zero biomechanical study.

In vitro biomechanical comparison of three different types of single- and double-row arthroscopic rotator cuff repairs: analysis of continuous bone-tendon contact pressure and surface during different simulated joint positions

HYPOTHESIS

We assessed bone-tendon contact surface and pressure with a continuous and reversible measurement system comparing 3 different double- and single-row techniques of cuff repair with simulation of different joint positions.

MATERIALS AND METHODS

We reproduced a medium supraspinatus tear in 24 human cadaveric shoulders. For the 12 right shoulders, single-row suture (SRS) and then double-row bridge suture (DRBS) were used. For the 12 left shoulders, DRBS and then double-row cross suture (DRCS) were used. Measurements were performed before, during, and after knot tying and then with different joint positions.

RESULTS

There was a significant increase in contact surface with the DRBS technique compared with the SRS technique and with the DRCS technique compared with the SRS or DRBS technique. There was a significant increase in contact pressure with the DRBS technique and DRCS technique compared with the SRS technique but no difference between the DRBS technique and DRCS technique.

CONCLUSIONS

The DRCS technique seems to be superior to the DRBS and SRS techniques in terms of bone-tendon contact surface and pressure.

Assessment of bone quality within the tuberosities of the osteoporotic humeral head: relevance for anchor positioning in rotator cuff repair

BACKGROUND

Tears of the rotator cuff are highly prevalent in patients older than 60 years, thereby presenting a population also suffering from osteopenia or osteoporosis. Suture fixation in the bone depends on the holding strength of the anchoring technique, whether a bone tunnel or suture anchor is selected. Because of osteopenic or osteoporotic bone changes, suture anchors in the older patient might pull out, resulting in failure of repair.

HYPOTHESIS

The aim of our study was to analyze the bone quality within the tuberosities of the osteoporotic humeral head using high-resolution quantitative computed tomography (HR-pQCT).

STUDY DESIGN

Descriptive laboratory study.

METHODS

Thirty-six human cadaveric shoulders were analyzed using HR-pQCT. The mean bone volume to total volume (BV/TV) as well as trabecular bone mineral densities (trabBMDs) of the greater tuberosity (GT) and the lesser tuberosity (LT) were determined. Within the GT, 6 volumes of interest (VOIs) within the LT, and 2 VOIs and 1 control volume within the subchondral area beyond the articular surface were set.

RESULTS

Comparing BV/TV of the medial and the lateral row, significantly higher values were found medially (P < .001). The highest BV/TV, 0.030% + or - 0.027%, was found in the posteromedial portion of the GT (P < .05). Regarding the analysis of the LT, no difference was found comparing the superior (BV/TV: 0.024% + or - 0.022%) and the inferior (BV/TV: 0.019% + or - 0.016%) portion. Analyzing trabBMD, equal proportions were found. An inverse correlation with a correlation coefficient of -0.68 was found regarding BV/TV of the posterior portion of the GT and age (P < .05).

CONCLUSION

Significant regional differences of trabecular microarchitecture were found in our HR-pQCT study. The volume of highest bone quality resulted for the posteromedial aspect of the GT. Moreover, a significant correlation of bone quality within the GT and age was found, while the bone quality within the LT seems to be independent from it.

CLINICAL RELEVANCE

The shape of the rotator cuff tear largely determines the bony site of tendon reattachment, although the surgeon has distinct options to modify anchor positioning. According to our results, placement of suture anchors in a medialized way at the border to the articular surface might guarantee a better structural bone stock.

Arthroscopic rotator cuff repair: scientific rationale, surgical technique, and early clinical and functional results of a knotless self-reinforcing double-row rotator cuff repair system

BACKGROUND

Rotator cuff repair has shown to improve shoulder function and reduce pain experienced by patients. Successful repairs should have high fixation strength, allow minimal gap formation, maintain stability, and restore normal anatomy and function of the supraspinatus footprint. The purpose of this study is to describe our preferred method for rotator cuff repair using a knotless self-reinforcing double-row system, and to cite biomechanical data rationalizing its use.

METHODS AND MATERIAL

Seventeen of 22 patients were identified as undergoing primary rotator cuff repair with minimum follow-up of 1 year (mean, 535 days; range, 370-939). The average age was 63 (range, 43-79). Data collected included average pain today, average worst pain, Single Assessment Numeric Evaluation (SANE), and patient satisfaction.

RESULTS

For all patients, average pain today and average worst pain decreased and functional scores (SANE) increased. Patient satisfaction was 9.8 out of 10 (range, 7-9). The patients also began rehabilitation earlier and returned to full activities at 4 months.

CONCLUSION

These results indicate that the knotless self-reinforcing double-row repair system is a viable option in treating rotator cuff tears. This system provides improved contact area and restores the native footprint of the tendon leading to better outcomes.

Single-row versus double-row rotator cuff repair: techniques and outcomes

Double-row rotator cuff repair techniques incorporate a medial and lateral row of suture anchors in the repair configuration. Biomechanical studies of double-row repair have shown increased load to failure, improved contact areas and pressures, and decreased gap formation at the healing enthesis, findings that have provided impetus for clinical studies comparing single-row with double-row repair. Clinical studies, however, have not yet demonstrated a substantial improvement over single-row repair with regard to either the degree of structural healing or functional outcomes. Although double-row repair may provide an improved mechanical environment for the healing enthesis, several confounding variables have complicated attempts to establish a definitive relationship with improved rates of healing. Appropriately powered rigorous level I studies that directly compare single-row with double-row techniques in matched tear patterns are necessary to further address these questions. These studies are needed to justify the potentially increased implant costs and surgical times associated with double-row rotator cuff repair.

Internal impingement of the shoulder in the overhead athlete

Internal impingement of the shoulder refers to a constellation of pathologic conditions, including, but not limited to, articular-sided rotator cuff tears, labral tears, biceps tendinitis, anterior instability, internal rotation deficit, and scapular dysfunction. Physiologic adaptations to throwing include increased external rotation, increased humeral and glenoid retroversion, and anterior laxity, all of which may predispose an individual to internal impingement. Nonoperative treatment should always be attempted first, with a focus on increasing the range of motion and improving scapular function. When an operative intervention is chosen, it is important to address microinstability in order to have a good outcome and prevent failure.

Double-row vs single-row rotator cuff repair: a review of the biomechanical evidence

HYPOTHESIS

A review of the current literature will show a difference between the biomechanical properties of double-row and single-row rotator cuff repairs.

BACKGROUND

Rotator cuff tears commonly necessitate surgical repair; however, the optimal technique for repair continues to be investigated. Recently, double-row repairs have been considered an alternative to single-row repair, allowing a greater coverage area for healing and a possibly stronger repair.

MATERIALS AND METHODS

We reviewed the literature of all biomechanical studies comparing double-row vs single-row repair techniques. Inclusion criteria included studies using cadaveric, animal, or human models that directly compared double-row vs single-row repair techniques, written in the English language, and published in peer reviewed journals. Identified articles were reviewed to provide a comprehensive conclusion of the biomechanical strength and integrity of the repair techniques.

RESULTS

Fifteen studies were identified and reviewed. Nine studies showed a statistically significant advantage to a double-row repair with regards to biomechanical strength, failure, and gap formation. Three studies produced results that did not show any statistical advantage. Five studies that directly compared footprint reconstruction all demonstrated that the double-row repair was superior to a single-row repair in restoring anatomy.

CONCLUSIONS

The current literature reveals that the biomechanical properties of a double-row rotator cuff repair are superior to a single-row repair.

LEVEL OF EVIDENCE

Basic Science Study, SRH = Single vs. Double Row RCR.

Knotless anatomic double-layer double-row rotator cuff repair: a novel technique re-establishing footprint and shape of full-thickness tears

The standard technique for restoring footprint after full-thickness tears of the rotator cuff includes double-row or transosseous-equivalent techniques. However, the anatomically typical bird's beak shape and profile of tendon insertion may not be originally restored and biomechanics may be altered. In this report, the authors describe a technique that involves creating two intratendinous stitches at different levels of the torn tendon. The first passes through the bursal-side layer, the second stitch through the joint-side layer. Both stitches may be performed in mattress suture configuration. The anchorage is performed by knotless anchors in order to avoid knots lying within the insertion area. The footprint is restored first medially then laterally by the use of double-row principles. The joint-side suture is anchored within the medially placed anchor. The bursal-side suture is anchored by a laterally placed anchor. The anatomic insertion and restoration of the shape and profile may be enabled by the described double-layer suture technique. Using a double-layer double-row repair may potentially improve functional results of rotator cuff repair constructs.

The effect of abduction and rotation on footprint contact for single-row, double-row, and modified double-row rotator cuff repair techniques

BACKGROUND

An abduction pillow and abduction and rotation exercises are commonly used after rotator cuff repair. The effect of glenohumeral abduction and rotation on footprint contact has not been elucidated.

HYPOTHESIS

Abduction will decrease tendon-to-bone contact for all repairs. A modified double-row repair will maintain footprint contact more effectively at each position of humeral abduction and rotation than double- or single-row repairs.

STUDY DESIGN

Controlled laboratory study.

METHODS

In 6 fresh-frozen human shoulders, a modified double-row supraspinatus tendon repair was performed; a suture limb from each of 2 medial anchors was bridged over the tendon and fixed laterally. Double- and single-row repairs were performed sequentially; a total of 3 repairs were tested. For all repairs, a Tekscan pressure sensor was fixed at the tendon-footprint interface. The tendon was loaded with 30 N. The shoulders were tested at 0 degrees , 30 degrees , and 60 degrees of abduction with 0 degrees of rotation. For both dual-row repairs, 5 rotation positions were tested.

RESULTS

The greatest contact areas at neutral rotation were achieved at 0 degrees of abduction for the modified double-row, double-row, and single-row repairs (151.3 +/- 10.7 mm2, 80.7 +/- 30.0 mm2, and 61.3 +/- 26.1 mm2, respectively), with values decreasing as abduction increased. Each repair was significantly different from one another at each abduction angle (P < .05), except between single- and double-row repairs at 0 degrees of abduction. Mean interface pressure exerted over the footprint was greater for the modified double-row technique than for the other techniques at each abduction angle (P < .05). With respect to rotation, the modified double-row repair had significantly more footprint contact than did the double-row repair at each position tested (P < .05).

CONCLUSION

For a given repair, increasing abduction at neutral rotation reduced footprint contact. Internal rotation to 60 degrees provided among the highest contact measurements. The modified double-row technique provided the most contact.

CLINICAL RELEVANCE

Results are consistent with the practice of immobilizing the shoulder with 30 degrees or less of abduction and up to 60 degrees of internal rotation to optimize footprint contact. A dual-row repair may maximize contact when initiating rehabilitation that involves abduction and rotation.

Evaluation of glenoid capsulolabral complex insertional anatomy and restoration with single- and double-row capsulolabral repairs

BACKGROUND

The purpose of this study was to evaluate the normal glenoid insertional anatomy of the anterior-inferior capsulolabral complex and to compare the ability of a single-row repair and a double-row suture bridge repair to restore the insertional anatomy.

METHODS

Eight fresh frozen cadaver shoulders were dissected and the native glenoid insertion of the anterior-inferior capsulolabral complex was digitized. Bankart lesions were created, the shoulders were randomized to receive either the standard single-row suture anchor repair or a double-row suture bridge repair, and the insertion repair sites were then digitized.

RESULTS

The single-row repair recreated 42.3% of the native footprint surface area while the double-row repair recreated 85.9%. The double-row repair was significantly larger and recreated significantly more of the native footprint compared with single-row repair (P < .01).

CONCLUSION

Double-row repair of the capsulolabral complex reestablishes the native insertional footprint on the anterior inferior glenoid better than a single-row repair.

LEVEL OF EVIDENCE

Basic science study.

Biomechanical evaluation of knotless anatomical double-layer double-row rotator cuff repair: a comparative ex vivo study

BACKGROUND

The layered configuration of the rotator cuff tendon is not taken into account in classic rotator cuff tendon repair techniques.

HYPOTHESIS

The mechanical properties of (1) the classic double-row technique, (2) a double-layer double-row (DLDR) technique in simple suture configuration, and (3) a DLDR technique in mattress suture configuration are significantly different.

STUDY DESIGN

Controlled laboratory study.

METHODS

Twenty-four sheep shoulders were assigned to 3 repair groups of full-thickness infraspinatus tears: group 1, traditional double-row repair; group 2, DLDR anchor repair with simple suture configuration; and group 3, DLDR knotless repair with mattress suture configuration. After ultrasound evaluation of the repair, each specimen was cyclically loaded with 10 to 100 N for 50 cycles. Each specimen was then loaded to failure at a rate of 1 mm/s.

RESULTS

There were no statistically significant differences among the 3 testing groups for the mean footprint area. The cyclic loading test revealed no significant difference among the 3 groups with regard to elongation. For the load-to-failure test, groups 2 and 3 showed no differences in ultimate tensile load when compared with group 1. However, when compared to group 2, group 3 was found to have significantly higher values regarding ultimate load, ultimate elongation, and energy absorbed.

CONCLUSION

The DLDR fixation techniques may provide strength of initial repair comparable with that of commonly used double-row techniques. When compared with the knotless technique with mattress sutures, simple suture configuration of DLDR repair may be too weak. Knotless DLDR rotator cuff repair may (1) restore the footprint by the use of double-row principles and (2) enable restoration of the shape and profile.

CLINICAL RELEVANCE

Double-layer double-row fixation in mattress suture configuration has initial fixation strength comparable with that of the classic double-row fixation and so may potentially improve functional results of rotator cuff repair.

A prospective randomized clinical trial comparing arthroscopic single- and double-row rotator cuff repair: magnetic resonance imaging and early clinical evaluation

BACKGROUND

Double-row arthroscopic rotator cuff repair has become more popular, and some studies have shown better footprint coverage and improved biomechanics of the repair.

HYPOTHESIS

Double-row rotator cuff repair leads to superior cuff integrity and early clinical results compared with single-row repair.

STUDY DESIGN

Randomized controlled trial; Level of evidence, 1.

METHODS

Forty patients were randomized to either single-row or double-row rotator cuff repair at the time of surgical intervention. Patients were followed with clinical measures (UCLA, Constant, WORC, SANE, ASES, as well as range of motion, internal rotation strength, and external rotation strength). Magnetic resonance imaging (MRI) studies were performed on each shoulder preoperatively, 6 weeks, 3 months, and 1 year after repair.

RESULTS

Mean anteroposterior tear size by MRI was 1.8 cm. A mean of 2.25 anchors for single row (SR) and 3.2 for double row (DR) were used. There were 2 retears at 1 year in each group. There were 2 additional cases that had severe thinning in the DR repair group at 1 year. The MRI measurements of footprint coverage, tendon thickness, and tendon signal showed no significant differences between the 2 repair groups. At 1 year, there were no differences in any of the postoperative measures of motion or strength. At 1 year, mean WORC (SR, 84.8; DR, 87.9), Constant (SR, 77.8; DR, 74.4), ASES (SR, 85.9; DR, 85.5), UCLA (SR, 28.6; DR, 29.5), and SANE (SR, 90.9; DR, 89.9) scores showed no significant differences between groups.

CONCLUSIONS

No clinical or MRI differences were seen between patients repaired with a SR or DR technique.

A biomechanical comparison of 2 techniques of footprint reconstruction for rotator cuff repair: the SwiveLock-FiberChain construct versus standard double-row repair

PURPOSE

The purpose of this study was to compare the biomechanical fixation parameters of a standard double-row rotator cuff repair with those of a knotless footprint reconstruction using the double-row SwiveLock-FiberChain technique (Arthrex, Naples, FL).

METHODS

Seven matched pairs of human cadaveric shoulders were used for testing (mean age, 48 +/- 10.3 years). A shoulder from each matched pair was randomly selected to receive a standard 4-anchor double-row repair of the supraspinatus tendon, and the contralateral shoulder received a 4-anchor double-row SwiveLock-FiberChain repair. The tendon was cycled from 10 N to 100 N at 1 Hz for 500 cycles, followed by a single-cycle pull to failure at 33 mm/s. Yield load, ultimate load, cyclic displacement, and mode of failure were recorded.

RESULTS

Yield load and ultimate load were higher for the SwiveLock-FiberChain repair compared with the standard double-row repair for 6 of the 7 treatment pairs; however, 1 cadaver had a contrary outcome, so the overall mean differences in yield load and ultimate load were not significantly different from 0 by Student t test (P > .15). Furthermore, smaller differences between yield load and ultimate load for the SwiveLock-FiberChain repair in 5 of the 7 treatment pairs showed a self-reinforcing mechanism.

CONCLUSIONS

Double-row footprint reconstruction with the knotless SwiveLock-FiberChain system in this study had yield loads, ultimate loads, and cyclic displacements that were statistically equivalent to those of standard double-row rotation cuff reconstructions.

CLINICAL RELEVANCE

The SwiveLock-FiberChain system's combination of strength, self-reinforcement, and decreased operating time may offer advantages to the surgeon, particularly when dealing with older patients in whom poor tissue quality and total operative time are important considerations.

Large and massive tears of the rotator cuff

The aim of this study was to determine the functional outcome and rate of re-tears following mini-open repair of symptomatic large and massive tears of the rotator cuff using a two-row technique.

The 24 patients included in the study were assessed prospectively before and at a mean of 27 months (18 to 53) after surgery using the Constant and the Oxford Shoulder scores. Ultrasound examination was carried out at follow-up to determine the integrity of the repair. Patient satisfaction was assessed using a simple questionnaire.

The mean Constant score improved significantly from 36 before to 68 after operation (p < 0.0001) and the mean Oxford Shoulder score from 39 to 20 (p < 0.0001). Four of the 24 patients (17%) had a re-tear diagnosed by ultrasound. A total of 21 patients (87.5%) were satisfied with the outcome of their surgery. The repair remained intact in 20 patients (83%). However, the small number of re-tears (four patients) in the study did not allow sufficient analysis to show a difference in outcome in relation to the integrity of the repair.

Arthroscopic three-point double-row repair for acute bony Bankart lesions

After mobilizing anteroinferior osseous Bankart lesion from the glenoid neck, a suture anchor loaded with differently colored non-absorbable braided sutures is placed on the medial edge in the glenoid neck along the rim fracture through the anterior-inferior trans-subscapularis tendon portal. Two same-colored suture limbs on the anchor are then pulled through the labrum using PDS suture shuttling simultaneously. These steps are repeated for the others suture limbs. The two same-color suture limbs located inferiorly are retrieved using the trans-subscapularis tendon portal. Both suture strands are threaded through the eyelet of a PushLock anchor on the distal end of the driver. The anchor is advanced into the pilot hole completely. These steps are repeated for a second anchor at the upper edge of the fracture in the glenoid rim using the anterior portal. This technique confers effective, firm fixation of the bony Bankart lesion by three-point fixation without the suture material crossing the glenoid cavity.

A comparison of single-versus double-row suture anchor techniques in a simulated repair of the rotator cuff

We compared time-dependent changes in the biomechanical properties of single-and double-row repair of a simulated acute tear of the rotator cuff in rabbits to determine the effect of the fixation techniques on the healing process.

A tear of the supraspinatus tendon was created in 80 rabbits which were separated into two equal groups. A single-row repair with two suture anchors was conducted in group 1 and a double-row repair with four suture anchors in group 2. A total of ten intact contralateral shoulder joints was used as a control group. Biomechanical testing was performed immediately post-operatively and at four and eight weeks, and histological analysis at four and eight weeks.

The mean load to failure in group 2 animals was greater than in group 1, but both groups remained lower than the control group at all intervals. Histological analysis showed similar healing properties at four and eight weeks in both groups, but a significantly larger number of healed tendon-bone interfaces were identified in group 2 than in group 1 at eight weeks (p < 0.012).

The ultimate load to failure increased with the number of suture anchors used immediately post-operatively, and at four and eight weeks. The increased load to failure at eight weeks seemed to be related to the increase in the surface area of healed tendon-to-bone in the double-row repair group.

The outcome and structural integrity of arthroscopic rotator cuff repair with use of the double-row suture anchor technique. Surgical technique

BACKGROUND

The reported rate of failure after arthroscopic rotator cuff repair has varied widely. The influence of the repair technique on the failure rates and functional outcomes after open or arthroscopic rotator cuff repair remains controversial. The purpose of the present study was to evaluate the functional and anatomic results of arthroscopic rotator cuff repairs performed with the double-row suture anchor technique on the basis of computed tomography or magnetic resonance imaging arthrography in order to determine the postoperative integrity of the repairs.

METHODS

A prospective series of 105 consecutive shoulders undergoing arthroscopic double-row rotator cuff repair of the supraspinatus or a combination of the supraspinatus and infraspinatus were evaluated at a minimum of two years after surgery. The evaluation included a routine history and physical examination as well as determination of the preoperative and postoperative strength, pain, range of motion, and Constant scores. All shoulders had a preoperative and postoperative computed tomography arthrogram (103 shoulders) or magnetic resonance imaging arthrogram (two shoulders).

RESULTS

There were thirty-six small rotator cuff tears, forty-seven large isolated supraspinatus or combined supraspinatus and infraspinatus tendon tears, and twenty-two massive rotator cuff tears. The mean Constant score (and standard deviation) was 43.2 +/- 15.1 points (range, 8 to 83 points) preoperatively and 80.1 +/- 11.1 points (range, 46 to 100 points) postoperatively. Twelve of the 105 repairs failed. Intact rotator cuff repairs were associated with significantly increased strength and active range of motion.

CONCLUSIONS

Arthroscopic repair of a rotator cuff tear with use of the double-row suture anchor technique results in a much lower rate of failure than has previously been reported in association with either open or arthroscopic repair methods. Patients with an intact rotator cuff repair have better pain relief than those with a failed repair. After repair, large and massive rotator cuff tears result in more postoperative weakness than small tears do.

Biomechanical comparison of single-row arthroscopic rotator cuff repair technique versus transosseous repair technique

This study determined the effect of tear size on gap formation of single-row simple-suture arthroscopic rotator cuff repair (ARCR) vs transosseous Mason-Allen suture open RCR (ORCR) in 13 pairs of human cadaveric shoulders. A massive tear was created in 6 pairs and a large tear in 7. Repairs were cyclically tested in low-load and high-load conditions, with no significant difference in gap formation. Under low-load, gapping was greater in massive tears. Under high-load, there was a trend toward increased gap with ARCR for large tears. All repairs of massive tears failed in high-load. Gapping was greater posteriorly in massive tears for both techniques. Gap formation of a modeled RCR depends upon the tear size. ARCR of larger tears may have higher failure rates than ORCR, and the posterior aspect appears to be the site of maximum gapping. Specific attention should be directed toward maximizing initial fixation of larger rotator cuff tears, especially at the posterior aspect.

[Arthroscopic reconstruction of the rotator cuff. The current gold standard?]

Arthroscopic rotator cuff repair has become the gold standard, and is now accepted throughout the world as the method of choice, for rotator cuff repair. As well as an experienced surgeon and meticulously correct arthroscopic technique, careful patient selection and adequate postoperative management are of decisive importance if a good postoperative outcome is to be achieved. With due consideration for all these factors the success rate is over 90%, as measured not only with reference to objective criteria, but also by patients' reports of their how satisfied they are with the result. This paper aims to report the indications, arthroscopic technique and postoperative protocol, and also the results of arthroscopic rotator cuff repair.

Comparison between single-row and double-row rotator cuff repair: a biomechanical study

The aim of this study was to compare the mechanical behavior under cyclic loading test of single-row and double-row rotator cuff repair with suture anchors in an ex-vivo animal model. For the present study, 50 fresh porcine shoulders were used. On each shoulder, a crescent-shaped full-thickness tear of the infraspinatus was performed. Width of the tendon tear was 2 cm. The lesion was repaired using metal suture anchors. Shoulders were divided in four groups, according the type of repair: single-row tension-free repair (Group 1); single-row tension repair (Group 2); double-row tension-free repair (Group 3); double-row tension repair (Group 4); and a control group. Specimens were subjected to a cyclic loading test. Number of cycles at 5 mm of elongation and at failure, and total elongation were calculated. Single-row tension repair showed significantly poorest results for all the variables considered, when compared with the other groups. Regarding the mean number of cycles at 5 mm of elongation and at failure, there was a nonsignificant difference between Groups 3 and 4, and both of them were significantly greater than Group 1. For mean total elongation, the difference between Groups 1, 3, and 4 was not significant, but all of them were significantly lower than the control group. A single-row repair is particularly weak when performed under tension. Double-row repair is significantly more resistant to cyclic displacement than single-row repair in both tension-free and tension repair. Double-row repair technique can be primarily considered for large, unstable rotator cuff tears to improve mechanical strength of primary fixation of tendons to bone.

The Roman Bridge: a "double pulley - suture bridges" technique for rotator cuff repair

Background

With advances in arthroscopic surgery, many techniques have been developed to increase the tendon-bone contact area, reconstituting a more anatomic configuration of the rotator cuff footprint and providing a better environment for tendon healing.

Methods

We present an arthroscopic rotator cuff repair technique which uses suture bridges to optimize rotator cuff tendon-footprint contact area and mean pressure.

Results

Two medial row 5.5-mm Bio-Corkscrew suture anchors (Arthrex, Naples, FL), which are double-loaded with No. 2 FiberWire sutures (Arthrex, Naples, FL), are placed in the medial aspect of the footprint. Two suture limbs from a single suture are both passed through a single point in the rotator cuff. This is performed for both anchors. The medial row sutures are tied using the double pulley technique. A suture limb is retrieved from each of the medial anchors through the lateral portal, and manually tied as a six-throw surgeon's knot over a metal rod. The two free suture limbs are pulled to transport the knot over the top of the tendon bridge. Then the two free suture limbs that were used to pull the knot down are tied. The end of the sutures are cut. The same double pulley technique is repeated for the other two suture limbs from the two medial anchors, but the two free suture limbs are used to produce suture bridges over the tendon, by means of a Pushlock (Arthrex, Naples, FL), placed 1 cm distal to the lateral edge of the footprint.

Conclusion

This technique maximizes the advantages of two techniques. On the one hand, the double pulley technique provides an extremely secure fixation in the medial aspect of the footprint. On the other hand, the suture bridges allow to improve pressurized contact area and mean footprint pressure. In this way, the bony footprint in not compromised by the distal-lateral fixation, and it is thus possible to share the load between fixation points. This maximizes the strength of the repair and provides a barrier preventing penetration of synovial fluid into the healing area of tendon and bone.