Partial-thickness rotator cuff tears

Bioactive Patch for Rotator Cuff Repairing via Enhancing Tendon-to-Bone Healing: A Large Animal Study and Short-Term Outcome of a Clinical Trial

Tissue engineering has demonstrated its efficacy in promoting tissue regeneration, and extensive research has explored its application in rotator cuff (RC) tears. However, there remains a paucity of research translating from bench to clinic. A key challenge in RC repair is the healing of tendon-bone interface (TBI), for which bioactive materials suitable for interface repair are still lacking. The umbilical cord (UC), which serves as a vital repository of bioactive components in nature, is emerging as an important source of tissue engineering materials. A minimally manipulated approach is used to fabricate UC scaffolds that retain a wealth of bioactive components and cytokines. The scaffold demonstrates the ability to modulate the TBI healing microenvironment by facilitating cell proliferation, migration, suppressing inflammation, and inducing chondrogenic differentiation. This foundation sets the stage for in vivo validation and clinical translation. Following implantation of UC scaffolds in the canine model, comprehensive assessments, including MRI and histological analysis confirm their efficacy in inducing TBI reconstruction. Encouraging short-term clinical results further suggest the ability of UC scaffolds to effectively enhance RC repair. This investigation explores the mechanisms underlying the promotion of TBI repair by UC scaffolds, providing key insights for clinical application and translational research.

The effect of platelet-rich fibrin, platelet-rich plasma, and concentrated growth factor in the repair of full thickness rotator cuff tears

BACKGROUND

Rotator cuff lesions rank among the prevalent causes of shoulder pain. Combining surgical interventions with growth factors, scaffolds, and stem cell therapies can effectively decrease the likelihood of rotator cuff repair recurrence. Platelet-rich plasma (PRP), platelet-rich fibrin (PRF), and concentrated growth factor (CGF), isolated from blood and rich in growth factors, have a critical role in cell migration, cell proliferation, and angiogenesis during the tissue regeneration process. Investigations have further substantiated the beneficial impact of PRP and PRF on the biomechanical and histologic attributes of the tendon-bone interface. We aimed to investigate the effectiveness of CGF compared with PRF and PRP in the repair of rotator cuff lesions as a new treatment strategy.

METHODS

Incision was performed on both shoulder regions of 21 adult rabbits. After 8 weeks, both shoulders of the rabbits were repaired by suturing. PRF and CGF were administered to 2 separate groups along with the repair. Tissues were collected for biomechanical measurements and histologic evaluations.

RESULTS

Histologically, CGF, PRF, and PRP showed similar results to the healthy control group. The level of improvement was significant in the PRF and PRP groups. In the PRF group, the distribution of Ki67 (+), CD31 (+), and CD34 (+) cells was determined intensely in the tendon-bone junction regions. Apoptotic cells increased significantly in the repair group compared with the healthy group, whereas fewer apoptotic cells were found in the PRF-, PRP-, and CGF-applied groups. In the biomechanical results, no statistical difference was recorded among the groups.

CONCLUSION

The use of PRF, PRP, and CGF in rotator cuff repair shows promise in shortening the treatment period and preventing the recurrence of rotator cuff lesions.

One- and 2-Year American Shoulder and Elbow Surgeons Scores Do Not Vary Significantly After Arthroscopic Rotator Cuff Repair: A Prospective Multicenter Analysis of 1,567 Patients

PURPOSE

To evaluate whether there are clinically significant changes in patient-reported outcomes between 1 and 2 years' postoperatively after arthroscopic rotator cuff repair (RCR).

METHODS

A retrospective analysis of prospective, multicenter registry was queried for all patients who underwent RCR. Patients with preoperative, 6-month, 1-year, and 2-year postoperative American Shoulder and Elbow Surgeons (ASES) scores were included. We evaluated mean postoperative ASES scores, Δ (change from preoperative) ASES, and the %MOI (% maximum outcome improvement). We also evaluated achievement of clinically significant outcomes (CSOs) for the ASES score, including the minimal clinically important difference (MCID), substantial clinical benefit, and patient-acceptable symptom state.

RESULTS

There were 1,567 patients with complete data through 2-year follow-up. There were small differences in achievement of CSOs from 1 to 2 years: 88% to 91% for MCID, 81% to 83% for substantial clinical benefit, and 65% to 71% for patient-acceptable symptom state. There were statistically significant differences from 1 to 2 years in mean ASES (87 to 88, P < .001), Δ ASES (37 to 39, P < .001), and %MOI (72% to 76%, P < .001); however, these changes were well below the MCID of 11.1. From 1 to 2 years, the mean ASES improved only 1.7 points (P < .001). At 1 year, patients achieved, on average, 97% of their 2-year ASES.

CONCLUSIONS

Both patient-reported outcomes and achievement of CSOs show small differences at 1 and 2 years after RCR. Given the large sample size, there were statistical differences, but these are unlikely to be clinically relevant.

LEVEL OF EVIDENCE

Level IV, case series.

Management of partial-thickness rotator cuff tears with autologous adipose-derived regenerative cells is safe and more effective than injection of corticosteroid

Symptomatic, partial-thickness rotator cuff tears (sPTRCT) are problematic. This study tested the hypothesis that management of sPTRCT with injection of fresh, uncultured, unmodified, autologous, adipose-derived regenerative cells (UA-ADRCs) is safe and more effective than injection of corticosteroid even in the long run. To this end, subjects who had completed a former randomized controlled trial were enrolled in the present study. At baseline these subjects had not responded to physical therapy treatments for at least 6 weeks, and were randomly assigned to receive respectively a single injection of UA-ADRCs (n = 11) or a single injection of methylprednisolone (n = 5). Efficacy was assessed using the ASES Total score, pain visual analogue scale (VAS), RAND Short Form-36 Health Survey and range of motion at 33.2 ± 1.0 (mean ± SD) and 40.6 ± 1.9 months post-treatment. Proton density, fat-saturated, T2-weighted MRI of the index shoulder was performed at both study visits. There were no greater risks connected with injection of UA-ADRCs than those connected with injection of corticosteroid. The subjects in the UA-ADRCs group showed statistically significantly higher mean ASES Total scores than the subjects in the corticosteroid group. The MRI scans at 6 months post-treatment allowed to "watch the UA-ADRCs at work".

Effects of Arthroscopic Atelocollagen Insertion in High-Grade Partial Articular Supraspinatus Tendon Avulsion Lesions: A Retrospective Cohort Study With Propensity Score Matching

Background

This study sought to evaluate the effect of atelocollagen insertion into the bone-tendon interface of the repaired tendon after arthroscopic rotator cuff repair for high-grade partial articular supraspinatus tendon avulsion (PASTA) lesions.

Purpose

To compare clinical and radiological outcomes of atelocollagen-inserted rotator cuff repair and atelocollagen-noninserted rotator cuff repair in the high-grade PASTA lesions.

Study Design

Cohort study; Level of evidence, 3.

Methods

The data from 301 consecutive patients who underwent arthroscopic rotator cuff repair of PASTA lesions between January 2017 and June 2020 were retrospectively reviewed. Patients with minimum 2-year follow-up data were included and divided into 2 groups: those treated with transtendon suture-bridge repair without additional augmentation (group 1) and those with atelocollagen-inserted transtendon suture-bridge repair (group 2). Patients in group 2 were matched 1:1 to patients in group 1 using propensity score matching (n = 68 per group); and pain visual analog scale, American Shoulder and Elbow Surgeons, University of California, Los Angeles, Korean Shoulder Scoring System, Simple Shoulder Test, and range of motion scores were compared between these groups. Also, repaired tendon integrity and thickness were compared immediately, 6 months, and 1 year after surgery on magnetic resonance imaging (MRI) using the vertical distance from the midpoint footprint of the greater tuberosity.

Results

In most comparisons, there were no significant differences in outcome measures and range of motion between groups. However, less residual discomfort at the final follow-up was also documented in group 2 (P = .043). Also, the difference in forward flexion was 3.7° at 1 year and 5.4° at final follow-up, and the difference in abduction was 2.2° at final follow-up, which were all significantly greater in the experimental group. Group 2 showed significant greater tendon thickness of the repaired tendon immediately, 6 months, and 1 year after surgery on MRI (P≤ .001).

Conclusion

Addition of atelocollagen did not improve outcome scores. However, there was slightly greater flexion and abduction at final follow-up. Also, there was less residual discomfort at final follow-up.

Similar outcomes between transtendon repair and tear completion repair techniques for partial articular-sided supraspinatus tendon avulsion lesions: a systematic review and meta-analysis

PURPOSE

This study aimed to review studies comparing transtendon repair (TTR) with tear completion repair (TCR) techniques for partial articular-sided supraspinatus tendon avulsion (PASTA) lesions according to postoperative patient-reported outcomes and complications.

METHODS

Databases, including PubMed, Embase, Scopus, and Cochrane, were searched for studies published between 2008 and 2022 that directly compared the postoperative patient-reported outcomes and complications of the TTR and TCR techniques for PASTA lesions. Odds ratios (ORs) were calculated for dichotomous outcomes, while mean differences (MDs) were calculated for continuous outcomes.

RESULTS

A total of seven studies (497 shoulders) were analysed. No statistically significant differences in the postoperative clinical outcomes at the final follow-up were observed between the TTR and TCR techniques for PASTA lesions. The overall retear rates of the TTR and TCR techniques were 7.7% and 11.6%, respectively (corresponding healing rates were 92.3% and 88.4%), whereas the overall occurrence rates of adhesive capsulitis were 4.7% and 3.3%, respectively. Furthermore, no significant difference was observed in postoperative range of motion (forward flexion, MD = - 1.22, 95% confidence interval (95%CI) - 5.28 to 3.34, n.s.; external rotation, MD = - 1.39, 95% CI - 3.19 to 0.42, n.s.), overall retear rate (OR 0.72, 95% CI 0.29-1.08, n.s.), and occurrence rate of adhesive capsulitis (OR 1.11, 95% CI 0.35-3.52, n.s.) between the two techniques.

CONCLUSION

Both techniques improve clinical outcomes while having a low complication rate and a high rate of healing. No significant difference in clinical outcomes was observed between the two techniques.

LEVEL OF EVIDENCE

III.

Conservative Management of Partial Thickness Rotator Cuff Tears: A Systematic Review

BACKGROUND

Conservative management has emerged as an attractive option for partial thickness rotator cuff tears (PT-RCTs). A single algorithmic treatment strategy for patients with symptomatic PT-RCT has not yet been developed. This systematic review aims to ascertain whether a conservative approach to PT-RCTs yields positive results in terms of clinical outcomes and functional recovery.

METHODS

This is a systematic review of the literature on patients with PT-RCTs receiving conservative treatment with physiotherapy, platelet-rich plasma (PRP) injections, collagen injections, hyaluronic acid (HA) injections, or corticosteroids injections coupled with polydeoxyribonucleotide (PDRN). Outcomes such as the Visual Analog Scale (VAS) for pain, American Shoulder and Elbow Surgeons and Constant-Murley Score evaluations, as well as the Shoulder Pain and Disability Index and Euro Quality of Life-5D questionnaires were reported following a conservative approach.

RESULTS

Eleven studies were included. Six articles explored the outcomes of patients with PT-RCT treated with PRP injections. Significant improvements in VAS for pain were observed. Two studies examined collagen injections and reported variations in VAS for pain and Constant-Murley Score. Sodium hyaluronate and HA injections were studied in two other articles, showing notable improvements in American Shoulder and Elbow Surgeons scores. Corticosteroid and PDRN injections also displayed favorable outcomes. In addition, physical therapy protocols demonstrated improvements in VAS for pain and strength, particularly with eccentric rehabilitation.

CONCLUSIONS

Conservative management of PT-RCTs, involving physical therapy, PRP injections, collagen injections, corticosteroid injections, HA injections, and PDRN in jections, demonstrates favorable clinical outcomes. In addition, favorable results are observed in terms of decreased tear width and improved strength recovery, at least during a short-term follow-up. Unfortunately, long-term insight into the structural integrity of conservatively treated rotator cuff tendons following a partial injury has not been thoroughly evaluated yet.

STUDY DESIGN LEVELS OF EVIDENCE

Level IV-systematic review.

Single knotless-anchor with two ethicon 2# for Ellman grade III bursal-side partial thickness rotator cuff tears: a cadaveric biomechanical study and short-term clinical evaluation

BACKGROUND

Several surgical techniques are used to treat bursal-side partial thickness rotator cuff tears (PTRCTs). However, use of single knotless-anchor with two Ethicon 2# repair technique for PTRCTs has not been reported.

MATERIALS AND METHODS

Bursal-side PTRCTs (Ellman grade III, 75% thickness of tears) were created in the supraspinatus tendon in 16 fresh-frozen cadaveric shoulders. The specimens were randomly assigned to two equal groups: (1) Group A (Transtendon repair), a single knotless-anchor repair with two Ethicon 2#; (2) Group B, Conversion repair (Double-row, DR). Post-repair, each specimen was subjected to cyclic loading test from 5 to 100 N (50 cycles), followed by an ultimate failure test. The displacement of greater tuberosity (mm) and ultimate (N) were recorded. In the clinical study, 12 patients diagnosed with Ellman grade III Bursal-side PTRCTs (using a single knotless anchor with two Ethicon 2# repair techniques) were operated on and analyzed. Visual analog scale (VAS), American Shoulder and Elbow Surgeons Score (ASES), Constant-Murley Score (CMS), and range of motion (ROM) were assessed before surgery and at final minimum follow-up (>1year).

RESULTS

There was no significant between-group difference with respect to load-to-failure test (Group A, 359.25 ± 17.91 N; Group B, 374.38 ± 13.75 N, P > 0.05). There were no significant differences with respect to rotator cuff displacement of 10 mm (Group A, 190.50 ± 8.52 N; Group B, 197.25 ± 6.84 N, P > 0.05) and 15 mm (Group A, 282.25 ± 12.20 N; Group B, 291.13 ± 14.74 N, P > 0.05). However, there was significant between-group difference with respect to displacement of 3 and 5 mm (P < 0.05). In the clinical trial, all patients were followed up for an average of 20.4 months (12-29 months). At the last follow-up after surgery(minimum>1year), the VAS score was 0.50 ± 0.67 (0-2), the ASES score was 86.50 ± 3.96 (79-92), the CMS score was 85.08 ± 5.65 (74-93), the mean Forward flexion ROM was 154.00°± 12.48° (131°-169°), and the abduction ROM was 165.00°±13.26° (138°-173°). There was a statistically significant difference between the results of the preoperative and the last postoperative follow-up. The results of the last postoperative follow-up were statistically different from those of the preoperative follow-up (P < 0.05). Regarding complications, stiffness (2 cases) and shoulder impingement (1 case) occurred in 3 cases (25%).

CONCLUSION

A single knotless anchor with two Ethicon 2# may provide a biomechanically and clinically feasible option for the treatment of bursal-side Ellman grade III PTRCTs, particularly in resource-constrained settings.

MESH KEYWORDS

Bursal-side Ellman Grade III; Single Knotless-anchor; Double-row repair; Biomechanical study; Short-term clinical evaluation.

Anatomic characteristics of shoulder based on MRI accurately predict incomplete rotator cuff injuries in patients: relevance for predictive, preventive, and personalized healthcare strategies

Background and PPPM-related working hypothesis

In the diagnosis of incomplete rotator cuff injuries (IRCI), magnetic resonance imaging (MRI) and ultrasound examination often have false-positive and false-negative results, while arthroscopy is expensive, invasive, and complex. From the strategy of predictive, preventive, and personalized medicine (PPPM), shoulder anatomical characteristics based on MRI have been demonstrated to accurately predict IRCI and their clinical applicability for personalized prediction of IRCI.

Aims

This study aimed to develop and validate a nomogram based on anatomical features of the shoulder on MRI to identify IRCI for PPPM healthcare strategies.

Methods

The medical information of 257 patients undergoing preoperative MRI examination was retrospectively reviewed and served as the primary cohort. Partial-thickness rotator cuff tears (RCTs) and tendinopathy observed under arthroscopy were considered IRCI. Using logistic regression analyses and least absolute shrinkage and selection operator (LASSO), IRCI was identified among various preoperative factors containing shoulder MRI and clinical features. A nomogram was constructed and subjected to internal and external validations (80 patients).

Results

The following eight independent risk factors for IRCI were identified:AgeThe left injured sidesThe Goutallier classification of supraspinatus in oblique coronal positionThe Goutallier classification of supraspinatus in the axial positionAcromial thicknessAcromiohumeral distanceCoracohumeral distanceAbnormal acromioclavicular joint signalsThe nomogram accurately predicted IRCI in the development (C-index, 0.932 (95% CI, 0.891, 0.973)) and validation (C-index, 0.955 (95% CI, 0.918, 0.992)) cohorts. The calibration curve was consistent between the predicted IRCI probability and the actual IRCI ratio of the nomogram. The decision curve analysis and clinical impact curves demonstrated that the model had high clinical applicability.

Conclusions

Eight independent factors that accurately predicted IRCI were determined using MRI anatomical findings. These personalized factors can prevent unnecessary diagnostic interventions (e.g., arthroscopy) and can assist surgeons in implementing individualized clinical decisions in medical practice, thus addressing the goals of PPPM.

Supplementary Information

The online version contains supplementary material available at 10.1007/s13167-023-00333-5.

Rotator Cuff Repair in Pediatric and Adolescent Athletes: Indications and Outcomes

Rotator cuff (RC) tears in pediatric and adolescent athletes are rare events. In these patients, RC tears are more likely to be traumatic or related to overuse among overhead. Repeated movements of abduction and external rotation are frequent mechanisms of injury. The supraspinatus is the most commonly involved tendon and the articular-sided tears are more common than the bursal side. Magnetic resonance imaging is considered the gold standard for diagnosing RC tears. Conservative treatment, arthroscopic, and open repair are all effective treatment methods depending on the type of injury. The risk of growth plate injury in these patients should be always considered when planning surgical interventions. Return to sport for competitive-level throwing athletes represents the greatest challenge in the treatment of these injuries.

Total Healing of a Partial Rupture of the Supraspinatus Tendon Using Barbotage Technique Associated with Platelet-Rich Plasma: A Randomized, Controlled, and Double-Blind Clinical Trial

The prevalence of partial rotator cuff tears (PRCTs) is high in the general population. Our hypothesis is that barbotage, when associated with platelet-rich plasma (PRP), is an effective method for healing these tears. The aim of this study was to compare the effects of barbotage with or without PRP on the healing of partial supraspinatus tendon tears (PSTTs). This study assessed the Western Ontario Rotator Cuff Index score and ultrasound (US) images at 6 weeks and 6 months after treatment. Patients in both groups showed clinical improvement, with no significant difference in scores at 6 weeks. However, at 6 months, the PRP group exhibited significant improvement (p = 0.019). Both groups experienced a reduction in ST tear size, but the PRP group demonstrated a significant enhancement at 6 weeks and 6 months. In conclusion, the US-guided barbotage technique, whether associated with PRP or saline solution, proved to be an effective treatment for clinical improvement and reduction in the size of PSTT. Better clinical improvement results were observed with PRP at 6 months. The combination of PRP with barbotage was superior in reducing the size of the ST tear at both 6 weeks and 6 months, resulting in complete healing in 79.3% of the tears.

Transtendon technique versus repair after completion of the tear for articular-sided partial rotator cuff tear: a meta-analysis of comparative studies

BACKGROUND

Transtendon repair and repair after completion of the tear have been widely used to treat partial-thickness rotator cuff tears (PT-RCTs). The present study was aimed to compare the clinical outcomes and tendon integrity following arthroscopic repair of articular PT-RCTs using transtendon repair or repair after completion of the tear.

METHODS

We performed a systematic electronic database search on Cochrane Central Register of Controlled Trials, PubMed and Embase to identify articles equating articular-sided PT-RCTs repair. The randomized controlled clinical trials that met our criteria were evaluated for quality of methodology. The results obtained were further analyzed and correlated to present the benefits and drawbacks comparing the two surgical procedures.

RESULT

According to our inclusion and exclusion criteria, six articles were included in the present study. A total of 501 patients were analyzed as part of this study. The results indicated that both the surgical treatments provided excellent functional improvements and tendon integrity. However, no significant differences for the visual analogue scale (VAS) score, American Shoulder and Elbow Surgeons (ASES) score, constant score, range of motion, postoperative adhesive capsulitis, tendon integrity and patient satisfaction were found between the two cohorts (p > 0.05).

CONCLUSIONS

Both transtendon technique and repair after completion of the tear for articular-sided partial rotator cuff tear provide improvements in clinical outcome with a low complication rate and a high rate of healing.

Delaminated Tears of the Rotator Cuff: MRI Interpretation with Clinical Correlation

(1) Background: A delaminated tear is described as a horizontal split in the tendon substance. This review summarizes the clinical and radiologic characteristics of delaminated tears of the rotator cuff. (2) Methods: Initial radiological characteristics of a delaminated tear include the horizontal component of a partial-thickness tear determined using magnetic resonance (MR) arthrography. As demonstrated using indirect MR arthrography, the tear gradually progresses to be defined as either horizontal intrasubstantial splitting of the bursal and articular layers or differential retraction of the bursal and articular layers. (3) Results: The existence of delaminated tears is a poor prognostic factor in functional and morphologic outcomes after the repair of rotator cuff tendons and many surgical techniques have been introduced to solve this problem. Although the presence of a delaminated tear does not affect the arthroscopic repair outcome, the presence of medium-to-large, retracted delaminated tears may be an adverse negative prognostic factor after single-row repair. (4) Conclusion: Advances in imaging and surgical techniques have improved the detection of delaminated rotator cuff tears. Preoperative identification of delaminated tears on magnetic resonance imaging is clinically important because tailored surgical repair techniques must be chosen for successful outcomes.

MRI evaluation of shoulder pathologies in wheelchair users with spinal cord injury and the relation to shoulder pain

OBJECTIVE

To describe the number, specifics and co-occurrence of shoulder pathologies detected by MRI in manual wheelchair users with spinal cord injury and to evaluate the association between shoulder pathologies and presence of shoulder pain.

DESIGN

Cross-sectional observation study.

SETTING

Community.

PARTICIPANTS

Fifty-one wheelchair-dependent persons with spinal cord injury (44 males, 7 females, median age 50 years (IQR 14), median time since injury 24 years (IQR 16)) were allocated to pain or no-pain group based on the Wheelchair User Shoulder Pain Index.

INTERVENTIONS

Not applicable.

OUTCOME MEASURES

All persons underwent shoulder MRI. Pathologies were scored blinded by two experienced radiologists. Participant characteristics, number and severity of shoulder pathologies were analyzed descriptively. Logistic regression was performed to evaluate the association between MRI findings and shoulder pain.

RESULTS

The median number of co-occurring MRI findings per person ranged from 0 to 19 (out of 31 possible findings). The cluster of MRI findings occurring most often together were tendon tears of supraspinatus (present in 84%), subscapularis (69%) and biceps (67%) and osteoarthritis of acromioclavicular joint (80%). When correcting for age and time since injury, the logistic regression showed no statistically significant correlation between the individual pathologies and shoulder pain.

CONCLUSION

MRI findings of shoulder pathology are very frequent in persons with and without shoulder pain. Therefore, when diagnosing the cause of shoulder pain and planning interventions, health care professionals should keep this finding in mind and MRI should not be interpreted without careful consideration of clinical history and functional testing.

Isolated bursal-side infraspinatus tear diagnosed by computed tomography bursography: a case series

Background

Partial-thickness rotator cuff tears are commonly found in the articular-side tendon of the supraspinatus; however, isolated lesions, except those occurring in the supraspinatus tendons, are rare. We report three cases of isolated bursal-side infraspinatus tears that were difficult to detect by magnetic resonance imaging but could be visualized by computed tomography bursography.

Case presentation

Three Asian patients (59–71 years old) with shoulder pain ranging from 1 month to 3 years in duration were each diagnosed with shoulder impingement syndrome. Magnetic resonance imaging studies failed to show a tear of the rotator cuff tendon complex. However, computed tomography bursography showed a longitudinal infraspinatus partial-thickness tear on the bursal side in each case. Arthroscopic decompression of the subacromial space and debridement of the infraspinatus tendon tear successfully alleviated the shoulder pain in two of the three patients; the third patient did not undergo surgery and remained symptomatic at follow-up.

Conclusions

In patients with chronic shoulder pain but normal magnetic resonance imaging findings, computed tomography bursography should be considered, as bursal-side infraspinatus tears may be found in these patients. Furthermore, our findings provide a basis for larger studies to further establish the accuracy of computed tomography bursography for these lesions.

All-Inside Arthroscopic Partial Articular-Sided Supraspinatus Tendon Avulsion (PASTA) Repair Without Bunching of the Bursal Side of the Tendon

PASTA (partial articular-sided supraspinatus tendon avulsion) lesions are supraspinatus tendon tears involved the articular surface. PASTA lesions are commonly repaired using trans-tendon repair or tendon takedown and repair. Systematic reviews have shown that both techniques can improve shoulder function similarly. The advantages of trans-tendon repair are the preservation of the intact tendon and superior biomechanical strength. However, there is a risk that the tendon will become overtensioned and that the technique will create tendon bunching on the bursal side, resulting in imbalanced tendon tension. This Technical Note describes an all-inside arthroscopic trans-tendon repair technique of PASTA lesion without bunching the tendon's bursal side.

The Arthroscopic "Bellows" Sign Identifies Hidden Rotator Cuff Tears

The intraoperative recognition of rotator cuff tears continues to be a challenge in some cases, despite clinical suspicion, a physical examination suggesting a rotator cuff tear, and detection on preoperative imaging studies. Intraoperative identification can be elusive in partial tears including intratendinous tears and obscured full-thickness tears. The purpose of this Technical Note, and the associated technique video, is to discuss a visual sign for the detection of various rotator cuff tear pathologies. Derived from the dynamic fluid expansion and contraction of the affected tissues, this indicator is termed the arthroscopic "bellows" sign.

Optimal Management of Partial Thickness Rotator Cuff Tears: Clinical Considerations and Practical Management

Partial thickness rotator cuff tears have been diagnosed with increased frequency due to heightened awareness and an improvement in diagnostic modalities. When >50% of the tendon thickness has ruptured, intra-tendinous strain of the residual tendon increases. Surgery is generally confined to patients who have failed non-operative measures and have persistent symptoms. The rationale for repairing partial thickness tears lies in their limited self-healing capacity, and propensity to enlarge over time and progress to a full thickness defect. Although tear debridement and acromioplasty can improve pain and function, tear progression can occur, in addition to worse results being noted in bursal-sided defects. Several surgical strategies have been recommended but there is a lack of evidence to advocate one form of treatment over another. The aim of this narrative review is to discuss the treatment options for partial thickness tears of the rotator cuff.

Diagnosis and Management of Partial Thickness Rotator Cuff Tears: A Comprehensive Review

Partial thickness rotator cuff tears (PRCTs) are a challenging disease entity. Optimal management of PRCTs continues to be controversial. Although advances in magnetic resonance imaging and ultrasonography have aided in early diagnosis, arthroscopic evaluation remains the benchmark for diagnosis. Conservative treatment is often the first line of management for most patients; however, evidence suggests that surgical intervention may limit tear progression and the long-term sequelae. Surgical decision making is driven by factors such as age, arm dominance, etiology, activity level, tear thickness, and tear location. Many surgical options have been described in the literature to treat PRCTs including arthroscopic débridement, transosseous, in situ repair techniques, and tear completion and repair. Biologic supplements have also become an attractive alternative to aid in healing; however, the long-term efficacy of these modalities is largely unknown. This article will provide a detailed review of the etiology and natural history of PRCTs, as well as diagnosis, and current management to guide clinical decision-making and formulate an algorithm for management of PRCTs for the orthopaedic surgeon.

[Partial-Thickness Tear of Supraspinatus and Infraspinatus Tendon Revisited: Based on MR Findings]

The interpretation of MRI of partial-thickness rotator cuff tears can be challenging. This review describes the anatomic considerations for diagnosing partial-thickness tears, especially supraspinatus and infraspinatus tendon and summarizes the classification of partial-thickness rotator cuff tears, as well as provides an overview on partial-thickness tears with delamination.

Risk Factors for Supraspinatus Tears: A Meta-analysis of Observational Studies

Background:

The pathogenesis of rotator cuff tears remains unclear, and there is a lack of high-quality evidence-based research on the risk factors for supraspinatus tears.

Purpose:

To explore 10 potential risk factors for supraspinatus muscle tears.

Study Design:

Systematic review; Level of evidence, 3.

Methods:

This review was conducted according to the MOOSE (Meta-analysis Of Observational Studies in Epidemiology) guidelines. PubMed, Embase, and Web of Science were searched for cohort, case-control and cross-sectional studies published before January 2021 on supraspinatus tears. The following potential risk factors were analyzed: age, body mass index, male sex, female sex, arm dominance, diabetes mellitus, smoking, hypertension, thyroid disease, and the critical shoulder angle (CSA). Risk ratios (RRs) or weighted mean differences (WMDs) of related risk were calculated. The Egger test was used to evaluate publication bias.

Results:

A total of 9 articles from 8 countries were included; among the 3240 patients, 687 were included in the supraspinatus tear group, and 2553 were included in the nonsupraspinatus tear group. The meta-analysis showed that older age (WMD, 3.36 [95% confidence interval (CI), 0.53-6.20]; P = .02), male sex (RR, 0.87 [95% CI, 0.78-0.97]; P = .01), smoking (RR, 2.21 [95% CI, 1.56-3.14]; P < .00001), diabetes (RR, 1.67 [95% CI, 1.03-2.70]; P = .04), hypertension (RR, 1.51 [95% CI, 1.16-1.97]; P = .002), and the CSA (WMD, 2.25 [95% CI, 1.39-3.12]; P < .00001) were risk factors for supraspinatus tears.

Conclusion:

Older age, male sex, smoking, diabetes, hypertension, and a higher CSA were found to be risk factors for supraspinatus tears in this meta-analysis review. Identifying risk factors for supraspinatus tears early can help clinicians identify these high-risk patients and choose appropriate treatments.

Rotator cuff retear after repair surgery: comparison between experienced and inexperienced surgeons

Background

We hypothesized in this study that the characteristics of retear cases vary according to surgeon volume and that surgical outcomes differ between primary and revision arthroscopic rotator cuff repair (revisional ARCR).

Methods

Surgeons performing more than 12 rotator cuff repairs (RCRs) per year were defined as high-volume surgeons, and those performing fewer than 12 RCRs were considered low-volume surgeons. Of the 47 patients who underwent revisional ARCR at our clinic enrolled in this study, 21 cases were treated by high-volume surgeons and 26 cases by low-volume surgeons. In all cases, the interval between primary surgery and revisional ARCR, degree of “acromial scuffing,” number of anchors, RCR technique, retear pattern, fatty infiltration, retear size, operating time, and clinical outcome were recorded.

Results

During primary surgery, significantly more lateral anchors (p=0.004) were used, and the rate of use of the double-row repair technique was significantly higher (p<0.001) in the high- versus low-volume surgeon group. Moreover, the “cut-through pattern” was observed significantly more frequently among the cases treated by high- versus low-volume surgeons (p=0.008). The clinical outcomes after revisional ARCR were not different between the two groups.

Conclusions

Double-row repair during primary surgery and the cut-through pattern during revisional ARCR were more frequent in the high- versus low-volume surgeon groups. However, no differences in retear site or size, fatty infiltration grade, or outcomes were observed between the groups.

Isolated bioinductive repair of partial-thickness rotator cuff tears using a resorbable bovine collagen implant: two-year radiologic and clinical outcomes from a prospective multicenter study

BACKGROUND

Current surgical treatment options for partial-thickness tears (eg, takedown and repair, in situ repair) are limited by the degenerative nature of the underlying tendon and may require extensive intervention that can alter the anatomic footprint. The complexity of available techniques to address these issues led to the development of a resorbable collagen implant, which can be used to create a bioinductive repair of partial-thickness tears.

METHODS

We prospectively enrolled 33 patients with chronic, degenerative, intermediate-grade (n = 12), or high-grade (n = 21) partial-thickness tears (11 articular, 10 bursal, 4 intrasubstance, and 8 hybrid) of the supraspinatus tendon in a multicenter study. After arthroscopic subacromial decompression without a traditional rotator cuff repair, a bioinductive implant was secured over the bursal surface of the tendon. Clinical outcomes were assessed using American Shoulder and Elbow Surgeons (ASES) and Constant-Murley scores (CMS) preoperatively and at 3 months, 1 year, and 2 years postoperatively. Magnetic resonance imaging was performed to assess postoperative tendon healing and thickness at the original tear site.

RESULTS

At 2-year follow-up, mean ASES and CMS scores improved both clinically and statistically at 1 and 2 years, compared with baseline, for intermediate- and high-grade tears. There was magnetic resonance imaging evidence of new tissue fill-in within the original baseline tear in 100% of the intermediate-grade tears and 95% of the high-grade tears. In 90.9% of the intermediate-grade tears and 84.2% of the high-grade tears, this new tissue fill-in represented at least an additional 50% of the volume of the initial lesion. From baseline to 2-year follow-up, the mean tendon thickness increased by 1.2 mm (standard deviation, 1.3; P = .012) and 1.8 mm (standard deviation, 2.2; P = .003) in the intermediate- and high-grade tears, respectively. The analysis of tear grade and location revealed no statistically significant difference in the change in mean tendon thickness at any time point. One patient with a high-grade articular lesion demonstrated progression to a full-thickness tear; however, the patient was noncompliant and the injury occurred while shoveling snow 1 month after surgery. Neither tear location nor treatment of bicep pathology affected the ASES or CMS scores at any follow-up point. No serious adverse events related to the implant were reported.

CONCLUSION

Final results from this 2-year prospective study indicate that the use of this resorbable bovine collagen implant for isolated bioinductive repair of intermediate- and high-grade partial-thickness rotator cuff tears of the supraspinatus is safe and effective, regardless of tear grade and location.

The Evolving Roles of MRI and Ultrasound in First-Line Imaging of Rotator Cuff Injuries

Rotator cuff tears are the most likely source of shoulder pain in adults and may cause protracted disability. Management of rotator cuff tears is associated with considerable costs. Accurate diagnosis can guide surgical planning and help achieve a favorable clinical outcome. While radiographs remain the initial imaging test for shoulder injury, the roles of MRI and ultrasound (US) as first-line imaging after radiography are evolving. This review leverages current literature and the practical experience of subspecialty musculoskeletal radiologists from different institutions in describing a practical approach to imaging rotator cuff pathology. Both MRI and US are accurate for identifying rotator cuff tears, but each has advantages and shortcomings. As both modalities currently represent reasonable first-line approaches, considerable practice variation has evolved. Given the low cost of US, imagers should strive to optimize the quality of shoulder US examinations and to build referrer confidence in this modality. The roles of direct CT and MR angiography, as well as imaging evaluation of the postoperative rotator cuff, are also considered. Through careful selection among the available imaging modalities, as well as optimal performance and interpretation of such examinations, radiologists can positively contribute to the diagnosis and treatment of patients with rotator cuff injuries.

Mid-Term Outcomes after Arthroscopic "Tear Completion Repair" of Partial Thickness Rotator Cuff Tears

Background and Objectives: Different arthroscopic procedures are used for partial-thickness rotator cuff tears (PT-RCTs), but there is still no evidence on the superiority of one procedure over the other. The aim of this study was to evaluate the clinical outcomes and the rate of complications of a tear completion repair (TCR) technique. Materials and Methods: Patients who had undergone arthroscopic TCR technique for PT-RCTs with a follow-up of at least 2-years after surgery were included. The TCR technique involved the removal of the "critical zone" and creating microfractures to biologically support tendon healing. Functional outcomes were assessed prospectively by the Constant score (CS) and active and passive range of movement (ROM). Pain and patient satisfaction were measured using a visual analog scale (VAS). Complication rates were recorded, and tendon integrity was assessed with magnetic resonance imaging (MRI) or ultrasound performed at least 2-years after surgery. Results: Eighty-seven patients with a median age of 57 years were followed-up for a median of 5 years. The CS score improved from 53.5 preoperatively to 94.0 postoperatively (p < 0.001). Median VAS score decreased from 8.6 to 1.0 (p < 0.0001). Median patient satisfaction was 9.3. The overall complication rate was 14.9%. Conclusions: Patients with PT-RCTs of the supraspinatus tendon treated by the TCR technique with "critical zone" removal and biological stimulation by microfractures showed good functional results with excellent strength recovery, a high degree of patient satisfaction, and resolution of painful symptoms at mid-term follow-up.

Clinical Outcome of Transtendon Repair of Partial Articular Supraspinatus Tendon Avulsion Tear

Partial articular supraspinatus tendon avulsion (PASTA) tears are common. However, there is no consensus on the optimal surgical technique for the management of grade 3 tears (>50%). The authors report a retrospective consecutive case series of 64 patients with grade 3 PASTA lesions. The patients were treated by 2 surgeons from 2 centers with the same transtendon repair technique and implant system. The preoperative Oxford Shoulder Score (OSS) was compared with the postoperative OSS at final follow-up (mean, 28 months). Significant improvement in mean OSS occurred from 19.2 (SD, 7.5) preoperatively to 39.8 (SD, 7.8) postoperatively (P=.0001), and patient satisfaction rates were high (88%). The authors believe that transtendon repair of PASTA lesions of 50% or more is beneficial. High-quality randomized controlled trials are required to compare the benefit of repair vs debridement alone. [Orthopedics. 2020;43(6):e533-e537.].

Insufficient integrity of partial articular surface tendon avulsion lesions after arthroscopic trans-tendon repair: Comparison with integrity after arthroscopic repair after conversion to a full thickness tear

BACKGROUND

For the surgical treatment of severe partial articular surface tendon avulsion (PASTA) lesions, 2 repair techniques, i.e., arthroscopic trans-tendon repair and arthroscopic repair after conversion to a full thickness tear, are widely used, and a satisfactory clinical outcome with both has been reported. The purpose of this study was to investigate integrity of the repaired rotator cuff based on second-look arthroscopy and to compare the above two repair techniques.

METHODS

Thirty-seven shoulders underwent PASTA lesion repair arthroscopically, with 20 shoulders receiving second-look arthroscopy. According to the repair technique, the shoulders were divided into 2 groups, which were 10 shoulders with trans-tendon repair (group P) and 10 shoulders with repair after conversion to a full thickness tear (group C). Second-look arthroscopy was done at a minimum of 3 months after initial surgery, with the mean interval until second-look arthroscopy being 5.6 months (3-13) in group P and 5.1 months (3-9) in group C. The reasons for second-look arthroscopy were pain with contracture in 15 patients, as well as pain in 4 patients and muscle weakness at abduction in one patient.

RESULTS

In group P, there was complete rotator cuff continuity in 3 shoulders, partial continuity in 4, and failure in 3, while group C had complete continuity in 8 shoulders, partial continuity in 1, and failure in 1. Adhesions of the subacromial bursa were seen in all shoulders, while contracture of the posterior capsule was noted in 5 shoulders from group P and 9 shoulders from group C, and contracture of the rotator interval was identified in 7 shoulders from group P and 9 shoulders from group C.

CONCLUSIONS

Second-look arthroscopy revealed that the integrity of the rotator cuff after trans-tendon repair of severe PASTA lesions was often unsatisfactory in patients with symptomatic shoulder. On the other hand, complete continuity was seen in most shoulders underwent repair after conversion to a full thickness tear.

Fibrosis in the rotator interval associated with articular vs. bursal side partial-thickness rotator cuff tears

Background

The pathogenesis of articular- and bursal-sided partial-thickness rotator cuff tears (PTRCTs) is considered to be different, and associated lesions with PTRCTs need to be examined.

Methods

The current study consisted of 76 shoulders of 73 patients (27 men, 46 women, 64.0 ± 8.3 years old) who underwent mini-open repair after conversion to full-thickness tears for either articular side (group A; n = 56) or bursal side (group B; n = 20) PTRCT with at least a 2-year follow-up. Clinical outcomes and their images were compared between the groups. Plain radiographs were used with the arm passively elevated in maximum elevation to assess restriction of glenohumeral motion.

Results

The retear rate was not significantly different between the groups. Both groups showed significant improvement in functional scores at the final follow-up. Patients in group A showed a higher incidence of preoperative fibrosis in the rotator interval (69.6% vs. 35.0%, respectively; P = .006) and a lower incidence of an acromial spur (7.1% vs. 35.0%, respectively; P = .008) compared with group B. Plain radiographs with arm elevation showed restriction of glenohumeral movement in 49 of 76 shoulders (64.5%) preoperatively, including 36 of the 46 shoulders with fibrosis and 13 of the other 30 shoulders.

Conclusion

Both articular- and bursal-sided PTRCTs showed significant functional improvements after surgery. The articular-sided tears had a lower incidence of an acromial spur, but had a higher incidence of fibrosis in the rotator interval, which led to a limitation in glenohumeral motion.

The Postoperative Rotator Cuff

MR imaging interpretation following rotator cuff repair can be challenging and requires familiarity with various types of rotator cuff tear, their surgical treatments, normal postoperative MR imaging appearance, and complications. This article reviews the common surgical procedures for the reparable and nonreparable massive rotator cuff tears, their expected postoperative MR imaging findings, and imaging appearance of a range of complications.

Safety and efficacy of treating symptomatic, partial-thickness rotator cuff tears with fresh, uncultured, unmodified, autologous adipose-derived regenerative cells (UA-ADRCs) isolated at the point of care: a prospective, randomized, controlled first-in-human pilot study

Background

This study tested the hypothesis that treatment of symptomatic, partial-thickness rotator cuff tears (sPTRCT) with fresh, uncultured, unmodified, autologous adipose-derived regenerative cells (UA-ADRCs) isolated from lipoaspirate at the point of care is safe and more effective than corticosteroid injection.

Methods

Subjects aged between 30 and 75 years with sPTRCT who did not respond to physical therapy treatments for at least 6 weeks were randomly assigned to receive a single injection of an average 11.4 × 10⁶ UA-ADRCs (in 5 mL liquid; mean cell viability: 88%) (n = 11; modified intention-to-treat (mITT) population) or a single injection of 80 mg of methylprednisolone (40 mg/mL; 2 mL) plus 3 mL of 0.25% bupivacaine (n = 5; mITT population), respectively. Safety and efficacy were assessed using the American Shoulder and Elbow Surgeons Standardized Shoulder Assessment Form (ASES), RAND Short Form-36 Health Survey, and pain visual analogue scale (VAS) at baseline (BL) as well as 3 weeks (W3), W6, W9, W12, W24, W32, W40, and W52 post treatment. Fat-saturated T2-weighted magnetic resonance imaging of the shoulder was performed at BL as well as at W24 and W52 post treatment.

Results

No severe adverse events related to the injection of UA-ADRCs were observed in the 12 months post treatment. The risks connected with treatment of sPTRCT with UA-ADRCs were not greater than those connected with treatment of sPTRCT with corticosteroid injection. However, one subject in the corticosteroid group developed a full rotator cuff tear during the course of this pilot study. Despite the small number of subjects in this pilot study, those in the UA-ADRCs group showed statistically significantly higher mean ASES total scores at W24 and W52 post treatment than those in the corticosteroid group (p < 0.05).

Discussion

This pilot study suggests that the use of UA-ADRCs in subjects with sPTRCT is safe and leads to improved shoulder function without adverse effects. To verify the results of this initial safety and feasibility pilot study in a larger patient population, a randomized controlled trial on 246 patients suffering from sPTRCT is currently ongoing.

Trial registration

Clinicaltrials.gov ID NCT02918136. Registered September 28, 2016, https://clinicaltrials.gov/ct2/show/NCT02918136.

Level of evidence

Level I; prospective, randomized, controlled trial.

Repair integrity and functional outcomes of arthroscopic repair for intratendinous partial-thickness rotator cuff tears

PURPOSE

We evaluated the clinical and radiological outcomes of arthroscopic repair of intratendinous partial-thickness rotator cuff tears.

METHODS

We retrospectively reviewed 30 patients who underwent arthroscopic repair of intratendinous partial-thickness rotator cuff tears from January 2010 to January 2015 in a single institute. Five outcome measures were used: a visual analog scale (VAS) pain score, the American Shoulder and Elbow Surgeons score, the shoulder rating scale of the University of California at Los Angeles, the Constant-Murley score, and range of motion (ROM). Pain was recorded using the VAS. Active ROM was measured goniometrically. Rotator cuff repair integrity was determined via magnetic resonance imaging or ultrasonography at least 6 months after arthroscopic repair.

RESULTS

Of the 30 patients, 29 (96.6%) returned for functional follow-up evaluation no earlier than 2 years after the operation. All functional scores exhibited significant improvements (all p = 0.000). The VAS improved from a mean of 5.8 ± 1.6 to 2.5 ± 2.6 ( p = 0.000). The mean active ROM of forward flexion changed from 149.8 ± 33.8° preoperatively to 172.4 ± 9.1° ( p = 0.001) at the last follow-up; abduction changed from 115.6 ± 50.3° to 171.3 ± 15.9° ( p = 0.000). Postoperative radiological evaluation revealed retearing in three patients (3/28, 10.7%), including two with articular-side partial-thickness retears and one with a bursal-side partial-thickness retear.

CONCLUSION

Arthroscopic repair of intratendinous partial-thickness rotator cuff tears was associated with a retearing rate of 10.7% on radiological follow-up and afforded significant clinical and functional improvements.

Detecting Rotator Cuff Tears: A Network Meta-analysis of 144 Diagnostic Studies

BACKGROUND

Many imaging techniques have been developed for the detection of rotator cuff tears (RCTs). Despite numerous quantitative diagnostic studies, their relative accuracy remains inconclusive.

PURPOSE

To determine which of 3 commonly used imaging modalities is optimal for the diagnosis of RCTs.

STUDY DESIGN

Systematic review; Level of evidence, 4.

METHODS

Studies evaluating the performance of magnetic resonance imaging (MRI), magnetic resonance arthrography (MRA), and ultrasound (US) used in the detection of RCTs were retrieved from the PubMed/MEDLINE and Embase databases. Diagnostic data were extracted from articles that met the inclusion/exclusion criteria. A network meta-analysis was performed using an arm-based model to pool the absolute sensitivity and specificity, relative sensitivity and specificity, and diagnostic odds ratio as well as the superiority index for ranking the probability of these techniques.

RESULTS

A total of 144 studies involving 14,059 patients (14,212 shoulders) were included in this network meta-analysis. For the detection of full-thickness (FT) tears, partial-thickness (PT) tears, or any tear, MRA had the highest sensitivity, specificity, and superiority index. For the detection of any tear, MRI had better performance than US (sensitivity: 0.84 vs 0.81, specificity: 0.86 vs 0.82, and superiority index: 0.98 vs 0.22, respectively). With regard to FT tears, MRI had a higher sensitivity and superiority index than US (0.91 vs 0.87 and 0.67 vs 0.28, respectively) and a similar specificity (0.88 vs 0.88, respectively). The results for PT tears were similar to the detection of FT tears. A sensitivity analysis was performed by removing studies involving only 1 arm for FT tears, PT tears, or any tear, and the results remained stable.

CONCLUSION

This network meta-analysis of diagnostic tests revealed that high-field MRA had the highest diagnostic value for detecting any tear, followed by low-field MRA, high-field MRI, high-frequency US, low-field MRI, and low-frequency US. These findings can help guide clinicians in deciding on the appropriate imaging modality.

Arthroscopic knotless single-row repair preserving full footprint versus tear completion repair for partial articular-sided rotator cuff tear

BACKGROUND

The comparison of clinical outcomes of arthroscopic footprint-preserving knotless single-row repair with the tear completion repair technique for articular-sided partial-thickness rotator cuff tears (PTRCTs) remains unclear.

METHODS

A total of 68 patients diagnosed with articular-sided PTRCTs who underwent rotator cuff repair between December 2014 and June 2015 were included. Of the 68 patients, 30 received footprint-preserving knotless single-row repair (group 1) and 38 received the tear completion repair technique (group 2). Preoperative and postoperative assessments were compared.

RESULTS

Both groups had significantly improved American Shoulder and Elbow Surgeons (ASES) scores (group 1: 48.2 preoperatively to 81.9 postoperatively, p < 0.001; group 2: 47.1 preoperatively to 84.9 postoperatively, p < 0.001) and visual analog scale (VAS) pain score (group 1: 6.0 preoperatively to 0.93 postoperatively, p < 0.001; group 2: 6.1 preoperatively to 1.1 postoperatively, p < 0.001), showing that the two procedures significantly improved postoperative shoulder function. No significant differences were shown in ASES score or VAS pain score between the two groups ( p > 0.05). The mean operation time was significantly shorter in group 1 with an average of 48.1 min than in group 2 with an average of 60.4 min ( p < 0.001).

CONCLUSIONS

Footprint-preserving knotless single-row repair obtains similar clinical results compared to tear completion repair in the treatment of articular-sided PTRCTs. Footprint-preserving knotless single-row repair may be a convenient choice for the treatment of articular-sided PTRCTs. Randomized controlled studies are needed to investigate whether the footprint-preserving knotless single-row repair yields better long-term outcomes through the protection of the bursal cuff and restoration of the healthy footprint.

[Ultrasound findings in chronic subacromal pain syndrome]

OBJECTIVE

Subacromial pain syndrome is a clinical picture characterised by pain located around the acromion triggered or exacerbated by shoulder movements. Ultrasound is a suitable imaging technique to evaluate the soft tissues occupying the subacromial space. The aim of this study was to describe the ultrasound findings in patients diagnosed with chronic subacromial pain syndrome by age, sex, and time since onset.

MATERIAL AND METHODS

We conducted a retrospective study of patients diagnosed with chronic SDS who underwent shoulder ultrasound. The variables studied were age, sex, affected side, time since onset, sonographic findings and ultrasound diagnosis. A descriptive study of the variables and statistical inference was performed with the chi-square test.

RESULTS

A total of 253 clinical histories of patients who underwent shoulder ultrasound were reviewed. Of these, 100 were selected who met the pre-established criteria. Involvement was bilateral in 5 of them and consequently the total number of ultrasound scans reviewed was 105. Differences were found between ultrasound finding by age, but not by sex or time since onset.

CONCLUSIONS

The findings of this study indicate that there is good clinical-radiological correlation between subacromial pain syndrome and ultrasound findings. The structure most frequently involved in the origin of the pain was the supraspinatus tendon. Differences were found by age but not by sex or the time since onset.

Arthroscopic Identification of Partial-Thickness Rotator Cuff Tears

Partial-thickness rotator cuff tears are among the most common challenges faced by orthopaedic surgeons today. The ability to adequately manage these injuries depends on identifying their full extent during arthroscopic evaluation. There are many ways to fully visualize these tears, including arm positioning and gentle debridement. The purpose of this article is to highlight several tips and techniques to enable full visualization of partial-thickness rotator cuff tears to determine appropriate treatment.

Safe time frame of staged bilateral arthroscopic rotator cuff repair

BACKGROUND

Few studies have assessed the outcomes of staged bilateral arthroscopic rotator cuff repair (ARCR). This study aimed to determine the influencing factors related to the outcomes of patients who underwent staged bilateral ARCR and to verify an optimal interval for performing the second rotator cuff repair in staged bilateral ARCR.

METHODS

We analyzed 166 shoulders that underwent staged bilateral ARCR. The average interval between the first- and second-side surgical procedures was 21.9 ± 19.7 months. The minimum follow-up period was 2 years.

RESULTS

Clinical outcomes and retear rates were not significantly different according to the order of surgical procedures, sex, arm dominance, age, and tear size (P > .05 for all). The cutoff value for the optimal interval between the first and second surgical procedures for the University of California, Los Angeles score and American Shoulder and Elbow Surgeons score was 9 months, with the area under the curve equal to 0.815 (P < .001) for the University of California, Los Angeles score and 0.806 (P < .001) for the American Shoulder and Elbow Surgeons score. The group with an interval of 9 months or less between the first- and second-side surgical procedures showed significantly inferior clinical outcomes and a higher retear rate (35%) compared with the group with an interval greater than 9 months (retear rate, 10%) (P < .05).

CONCLUSION

Staged bilateral ARCR resulted in significant improvements in clinical outcomes regardless of the order of surgical procedures, sex, arm dominance, age, and tear size. To optimize clinical outcomes of staged bilateral ARCR, second-side surgery should be delayed until 9 months after the first-side surgical procedure.

Comparative Study between Multi-slice Computed Tomographic Arthrography and Arthroscopy in the Evaluation of Rotator Cuff Tears

Objective  To compare the imaging findings of anatomical alterations using multi-slice computed tomographic arthrography in the evaluation of rotator cuff tears in the shoulder, correlating them with the arthroscopy (the gold standard diagnostic test) findings. Materials and Methods  A longitudinal, prospective, comparative study of diagnostic accuracy performed in the period between June 2016 and June 2017 in patients of both sexes, aged between 40 and 70 years, with shoulder rotator cuff tendon tears and therapeutic need to undergo shoulder arthroscopy. Patients with contraindication to magnetic resonance imaging were included. After multi-slice computed tomographic arthrography, all patients underwent arthroscopy. Results  To obtain the results, the following parameters were determined: sensitivity, specificity, accuracy, positive predictive value, negative predictive value, and Kappa coefficient, and contrast between the imaging method and arthroscopy. Conclusion  In the impossibility of performing magnetic resonance imaging (the gold standard imaging technique), multi-slice computed tomographic arthrography is an imaging examination capable of evaluating/diagnosing rotator cuff tears.

Autologous Conditioned Plasma for tendon healing following arthroscopic rotator cuff repair. Prospective comparative assessment with magnetic resonance arthrography at 6 months' follow-up

INTRODUCTION

Despite improvements in technique and materials for rotator cuff repair, mean re-tear rates remain close to 30%. The aim of the present study was to assess injection of Autologous Conditioned Plasma (ACP™, Arthrex) for tendon healing after arthroscopic repair. The study hypothesis was that ACP™ improves the tendon-healing rate.

MATERIAL AND METHOD

A non-randomized comparative prospective study included all patients aged over 18 years operated on in 2010 for arthroscopic repair of full-thickness rotator cuff tear with≤2 fatty degeneration on the Goutallier classification, whatever the severity of retraction, on virgin non-osteoarthritic shoulder without contraindications for magnetic resonance (MR) arthrography. The surgical protocol was standardized. The first half of the patient sample received end-of-procedure ACP™ injection to the repaired tendon, tuberosity freshening surface and subacromial space, and the second (control) half received no supplementary treatment. The main endpoint was tendon healing on MR arthrography at 6 months according to Sugaya. Secondary endpoints comprised shoulder pain at rest on a numerical scale (0=no pain to 10=worst imaginable pain) and Constant functional score.

RESULTS

Two of the 58 patients refused MR arthrography and 7 were lost to follow-up. Forty-nine patients (26 ACP™, 23 controls) were analyzed: 20 male, 29 female; mean age, 61±7.3 years. There were no significant intergroup differences in healing rate at 6 months (ACP™ 73.1% vs. 78.3% controls; p=0.75), shoulder pain (2±1.8 vs. 2.6±1.7, respectively; p=0.24), or Constant score (77±13.5/100 vs. 72.4±12.3, respectively; p=0.18).

CONCLUSION

Associating ACP™ did not improve healing after arthroscopic rotator cuff repair. Sample size, however, had been calculated for a large expected difference, leading to lack of power.

LEVEL OF EVIDENCE

III; case-control study.

Functional outcomes and repair integrity after arthroscopic repair of partial articular supraspinatus tendon avulsion

INTRODUCTION

Partial-thickness rotator cuff tears are a common cause of shoulder pain and disability. Arthroscopic repair is an effective treatment for partial articular supraspinatus tendon avulsion (PASTA) lesions, and transtendon repair and completion of the tear and repair are the surgical techniques commonly used to treat such lesions. Our aim was to retrospectively evaluate the minimum 24-month clinical and radiological results of PASTA.

MATERIALS AND METHODS

Patients suffering from PASTA lesion who underwent arthroscopic repair with a minimum 24-month follow-up were included in this study. The Constant and Murley score (CMS) was used to assess the patients' functionality pre- and postoperatively. The postoperative patient assessment included the simple shoulder test (SST). Postoperative tendon integrity was evaluated by ultrasound examination.

RESULTS

151 patients (153 shoulders) were retrospectively evaluated 73.9 (24-142) months after a completion-repair (94 cases) or transtendon repair (59 cases) of a PASTA lesion. The CMS significantly improved from 47.7 (22-63) preoperatively to 84.2 (62-100) postoperatively (p < 0.001). The mean postoperative SST score was 10.1 (5-12), and 95% of patients were satisfied with the surgery. No significant differences were noted between the two techniques in terms of postoperative CMS, SST score and satisfaction. Seventy-four and 43 cases treated with completion and repair and transtendon repair, respectively, performed ultrasound examination 66.1 (24-142) months after surgery. The overall retear rate was 13.7%, supraspinatus retears were observed in ten shoulder subjected to completion and repair (13.5%) and six shoulders subjected to transtendon repair (13.9%), and no significant differences were noted between the two techniques as for CMS (p = 0.896), SST (p = 0.973), satisfaction (p = 0.621) and retear (p = 0.999). Males and younger patients had a higher postoperative CMS (p values < 0.001), and SST score (p < 0.001 and p = 0.038, respectively).

CONCLUSIONS

Arthroscopic repair of PASTA lesion achieves high rates of repair integrity regardless of repair type and high levels of functional recovery and patient satisfaction 6 years after surgery.

Can clinical assessment differentiate partial thickness rotator cuff tears from full thickness rotator cuff tears? A secondary analysis

Purpose: Shoulder pain causes significant disability, with rotator cuff disease as a common diagnosis. Differentially diagnosing partial tears of the rotator cuff tendons is difficult despite use of imaging and clinical examination. Our objective was to determine if a clinical assessment framework could discriminate between patients with partial and full thickness tears.Materials and Methods: Pre-operative baseline data from two randomized controlled trials of 452 adult patients awaiting rotator cuff repair were analyzed in this secondary analysis. Nineteen items from a pre-defined clinical assessment framework were investigated for association with the outcome of surgically confirmed partial or full thickness tear. Logistic regression tested independent associations and multivariable models were developed to create the most parsimonious model.Results: Thirty-two participants (7%) had partial thickness tears. Constant Power Score was the sole item associated with partial thickness tears (OR 1.07, 95% CI 1.02-1.12). Traumatic mechanism of injury trended toward significance (OR 2.17, 95% CI 1.06-4.48).Conclusions: Greater abduction strength (i.e., Constant Power Score) was associated with partial thickness tears. Other clinical assessment items did not differentiate between partial and full tears. Our results add to the growing body of research showing most clinical findings are not associated with a diagnosis in rotator cuff disease.Implications for RehabilitationGreater shoulder abduction strength (as measured with the Constant Power Score) was associated with partial thickness rotator cuff tears.Most findings within our clinical assessment framework did not distinguish between partial thickness and full thickness rotator cuff tears and thus, did not contribute to a differential pathoanatomical diagnosis.Since structural integrity of the rotator cuff and patient presentation show poor association, and rehabilitation intervention is often impairment-based, pathoanatomical diagnosis may not adequately direct non-surgical treatment. Including movement-based diagnoses or treatment classification systems in evaluation of rotator cuff disease may improve selection of appropriate conservative treatment.

Promoting effective tendon healing and remodeling

Daily activities subject our tendons to accumulation of sub-rupture fatigue injury which can lead to tendon rupture. Consequently, tendinopathies account for over 30% of musculoskeletal consultations. We adopted a multidisciplinary approach to determine the role of the extracellular matrix (ECM) in the pathogenesis of tendinopathy and impaired healing of ruptured tendons. We have been investigating three main areas: (i) the pathogenesis of tendon degeneration; (ii) approaches to promoting remodeling of sub-rupture fatigue injuries; and the (iii) role of the ECM in promoting scarless tendon healing. In this Kappa Delta Young Investigator award paper, we describe the key discoveries made in each of our three research areas of focus. Briefly, we discovered that sub-rupture fatigue damage can accumulate from just one bout of fatigue loading. Furthermore, any attempt to repair the fatigue damage diminishes as the severity of induced damage increases. We have utilized exercise to develop animal models of exercise-led degeneration and exercise-led repair of sub-rupture fatigue damage injuries, wherein underlying mechanisms can be uncovered, thereby overcoming a major hurdle to development of therapeutics. Since damage accumulation ultimately leads to rupture that is characterized by formation of a mechanically inferior scar, we have used the MRL/MpJ mouse to evaluate the role of the systemic environment and the local tendon environment in driving regeneration to identify new therapeutic pathways to promote scarless healing. Our data suggests that the therapeutic potential of the MRL/MpJ provisional ECM should be further explored as it may harness biological and structural mechanisms to promote scarless healing. © 2018 Orthopaedic Research Society. Published by Wiley Periodicals, Inc. J Orthop Res 36:3115-3124, 2018.

Predicting the outcome of conservative treatment with physiotherapy in adults with shoulder pain associated with partial-thickness rotator cuff tears - a prognostic model development study

BACKGROUND

Rotator cuff disorders represent the commonest type of painful shoulder complaints in clinical practice. Although conservative treatment including physiotherapy is generally recommended as first-line treatment, little is known about the precise treatment indications for subgroups of rotator cuff disorders, particularly people with shoulder pain associated with partial-thickness tears of the rotator cuff, PTTs: "symptomatic PPTs". The aim of this study was to develop a prognostic model for predicting the outcome of a phase of conservative treatment primarily with physiotherapy in adults with symptomatic PTTs.

METHODS

A prospective observational cohort study was conducted in an outpatient setting in Germany. Ten baseline factors were selected to evaluate nine pre-defined multivariable candidate prognostic models (each including between two and nine factors) in a cohort of adults with symptomatic atraumatic PTTs undergoing a three-month phase of conservative treatment primarily with physiotherapy. The primary outcome was change in the Western Ontario Rotator Cuff Index. The models were developed using linear regression and an information-theoretic analysis approach: Akaike's Information Criterion (AIC_C).

RESULTS

Eight candidate models were analyzed using data from 61 participants. Two "best models" were identified: smoking & pain catastrophizing and disability & pain catastrophizing. However, none of the models had a satisfactory performance or precision.

CONCLUSIONS

We could not determine a prognostic model with satisfactory performance and precision. Further high-quality prognostic model studies with larger samples are needed, but should be underpinned, and thus preceded, by robust research that enhances knowledge of relevant prognostic factors.

STUDY REGISTRATION

DRKS00004462 . Registered 08 April 2014; retrospectively registered (prior to the analysis).

Effectiveness of 3-dimensional shoulder ultrasound in the diagnosis of rotator cuff tears: A meta-analysis

BACKGROUND

Numerous quantitatively based studies measuring the accuracy of 3D shoulder ultrasound (US) for the diagnosis of rotator cuff tears remain inconclusive. In order to determine how effective 3D shoulder US is for detecting rotator cuff tears, a meta-analysis was performed systematically.

METHODS

Six electronic databases, PubMed/Medline, Embase, Cochrane Library, CNKI, VIP data, and Wanfang data, were utilized to retrieve articles praising the diagnostic value of 3D shoulder US for use in detecting rotator cuff tears. After screening and diluting out the articles that met inclusion criteria to be used for statistical analysis, the pooled evaluation indexes including sensitivity, specificity, and diagnostic odds ratio (DOR) as well as the summary receiver operating characteristic curve (SROC) were calculated utilizing Meta-Disc v.1.4.

RESULTS

Screening determined that out of 4220, 7 studies involving a total of 282 patients were deemed viable for inclusion in the meta-analysis. The results of the analysis showed that the sensitivity and specificity were at 94% and 83%, respectively, with a DOR of 60.06, Q* index of 0.9058 and the area under SROC of 0.9609. Additionally, a satisfactory accuracy of 3D shoulder US was observed in detecting full- and partial-thickness rotator cuff tears.

CONCLUSION

This meta-analysis suggests that 3D shoulder US is very effective and highly accurate to detect full-thickness rotator cuff tears, but may lack accuracy in the diagnosis of partial tears.

Shoulder Injuries in the Overhead-Throwing Athlete: Epidemiology, Mechanisms of Injury, and Imaging Findings

The unparalleled velocity achieved by overhead throwers subjects the shoulder to extreme forces, resulting in both adaptive changes and pathologic findings that can be detected at imaging. A key biomechanical principle of throwing is achieving maximum external rotation, which initially leads to adaptive changes that may result in a pathologic cascade of injuries. In addition to the well-established concepts of glenohumeral internal rotation deficit and internal impingement, osseous and soft-tissue injuries of the shoulder unique to overhead athletes are illustrated. The epidemiology and biomechanics of throwing injuries are reviewed, and examples from the authors' institutional experience with competitive, collegiate, and professional baseball players are provided to demonstrate the constellation of unique imaging findings seen in overhead throwing athletes. Given the widespread popularity of baseball, and other sports relying on overhead throwing motions at all playing levels from recreational to professional, it is important for radiologists in various practice settings to be familiar with the special mechanisms, locations, and types of shoulder injuries seen in the overhead throwing population. ^© RSNA, 2018.

Cut-off values of the Japanese Orthopaedic Association score corresponding to Constant scores for evaluating outcomes in rotator cuff tear

PURPOSE

To clarify the cut-off value of the Japanese Orthopaedic Association (JOA) score corresponding to rotator cuff tear outcome as evaluated by the Constant score.

METHODS

The subjects were 230 patients with rotator cuff tear. The Constant and JOA scores on the first examination in our hospital were evaluated. After investigation of the correlation between the Constant and JOA scores, the cut-off JOA score was calculated, corresponding to excellent, good and fair outcomes as evaluated by the Constant score.

RESULTS

The Constant and JOA scores on the first examination were 49.64 ± 12.84 and 72.52 ± 12.84, respectively, with a strong correlation ( r = 0.87, p < 0.01). Receiver operating characteristic analysis revealed that the cut-off JOA score was 87.0 for excellent outcome (area under the curve, AUC: 0.93; sensitivity: 100%; specificity: 88.6%; p < 0.01), 84.0 for good outcome (AUC: 0.94; sensitivity: 100%; specificity: 83.4%; p < 0.01) and 78.0 for fair outcome (AUC: 0.88; sensitivity: 100%; specificity: 71.3%; p < 0.01).

CONCLUSIONS

In patients with rotator cuff tear, good outcome as judged by a Constant score of ≥80 corresponds to a JOA score cut-off of 84.0. Judgement of the treatment outcomes and evaluation of the surgical method may be more accurate when using clear cut-off values for the scoring system employed, such as those determined in our study.