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Peak Performance Physical Therapy & Sports Training EVIDENCE-BASED PRACTICE UPDATE March 2023 Improving Clinical Decision Making on Scapular Dyskinesis with Subacromial Shoulder Pain by Mike Napierala, PT, SCS, CSCS, FAFS Clinical Scenario...What would you do? A 50 yr old female with chronic shoulder pain and stiffness comes to the office for a consult after failing two prior bouts with physical therapy and numerous injections. Recent MRI shows RC tendinopathy and small labral tearing. She is not in acute distress but limited significantly with ADL and fitness/recreational activities. AROM into elevation and abd’d rotations is most restricted along with neutral ER. She has painful weakness with RC testing but no signs of frank tearing. Scapular dyskinesis noted during descent from flexion and with resisted flexion at 1300. She did have prior dx of Adhesive Capsulitis and did not recover fully but did not feel PT was helping. She demonstrated a typical PT HEP routine of GH stretches and scapular retraction, serratus protraction/plus, and RC PRE. My clinical thinking is: Consider arthroscopy since PT and injections failed. Consider MUA to recover ROM unable to be attained through standard PT care and compliant HEP. Refer to PT for more thorough manual therapy and customized exercise including specifically serratus work to reduce scapular dyskinesis contributing to ongoing RC overload/irritation. Refer for deep tissue work with LMT to attempt ROM recovery and then send back to PT. CURRENT EVIDENCE Tangrood ZJ, Sole G, Riberio DC. Is there an association between changes in pain or function with changes in scapular dyskinesis: A prospective cohort study. Musculoskeletal Science and Practice. (48) 2020. 1-7. https://doi.org/10.1016/j.msksp.2020.102172 (We’d love to hear your professional insights on this topic. Let me know your thoughts after reading this summary at PT@PeakPTRochester.com or if you have a patient case you'd like to discuss) SUMMARY: Shoulder pain is a common diagnosis seen by physicians/orthopedists. Oftentimes scapular dyskinesis (SD) may be present. Testing for SD using reliable methods and determining potential meaningfulness contribute to clinical decision making regarding treatment recommendations, especially in the case of “failed” conservative care where more invasive procedures are not called for or necessary yet. Current data has both variable and contradictory findings surrounding SD and the related serratus anterior and/or lower trapezius involvement, along with a lack of clear causal level relationships to pain and/or injury. Tangrood et al demonstrated an association over 8 weeks in a group of 44 participants with shoulder pain that improvements in scapular dyskinesis testing was associated with improved PSFS self-report function scores. One confounding variable included that 65% of those completing all testing were receiving physical therapy and 35% were not. These groups were not separately analyzed which may have shed more light on causes for improvement. Common SD approaches in physical therapy often involve activation of the serratus anterior (SA) that utilizes a “plus” movement (i.e. protraction). While the SA certainly does and can protract the shoulder this risks activation of the pec minor as well with the ongoing risk of facilitating a protraction posturing that otherwise has been identified as a potential risk factor for shoulder pain. In overhead activities the scapula must tilt posteriorly while upward rotating. Many traditional methods of testing and training for SD also utilize long lever positions that painful shoulders struggle in. Authentic biomechanics approaches are necessary to promote scapular integrity via medial border stabilization (superior through inferior angles) along with upward rotation without compromising biceps or rotator cuff tendons or labral structures. A physician’s ability to identify SD in clinical exams in order to prescribe and monitor appropriate PT is often key in achieving optimal outcomes. Background: Scapular dyskinesis (SC) is a debated topic and it is unclear whether it is causative of shoulder dysfunction and subacromial pain or a consequence of symptoms, and, whether the presence of and changing of SD affects function or pain. Purpose: To assess the association of changes in subacromial shoulder pain or function with SD changes over time. Methods: Observational, prospective, cohort study of 44 participants (37 who completed baseline and 8 wk follow up testing), with 24 receiving physical therapy and 13 no treatment, using Numeric Pain Rating Scale (NPRS) 0-10 scale for “at rest” and “during movement” , self-report Patient Specific Functional Scale (PSFS), and the scapular dyskinesis test (0=normal scapular movement and 6= highest scapular dyskinesis, summing using Kibler et al system scoring). Findings: Improvement in function showed a fair association with improved SD (correlation coefficient = -0.4) while no associations found for pain at rest or pain with movement to changes in SD. 89% of patients showed subtle to obvious SD at baseline. Participants showed no changes in “pain at rest”, medium improvements of “pain during movement”, and large function improvements (28.0 mean PSFS score difference w p=0.000) but no significant SD changes. Author's Conclusion: Improved function in patients with subacromial pain was associated with improvements in scapular dyskinesis. Future studies needed to determine causal effects. THE PEAK PERFORMANCE PERSPECTIVE Shoulder pain is one of the most common orthopedic complaints seen by orthopedists and PCP’s alike. One of the most frequent diagnoses includes some form of RC syndrome (tendinitis, tendinosis, tears, impingement, etc.) which contributes to subacromial shoulder pain. Physicians discerning best practices for non-operative care recommendations are often tasked with determining obvious contributing factors they expect to be addressed in physical therapy. Understanding and testing for scapular dyskinesis underlies prescribing practices for these patients and especially for cases of “failed care” where more simple protocol based therapy approaches have not worked. It is also potentially a great example of the concept “because a muscle can doesn’t mean that it does” - in regard to how we classically test and exercise in comparison to how it actually functions. Directing care for shoulder pain of various sorts, whether it be tendon related, bursal, labral, or instability related can be difficult when considering there are few or even no clear truly “BEST practices” approaches that have been proven clearly superior to others. Many studied are more so “only practices” or “doing this happens to work” versus actually finding “bests” in treatment. That makes prescribing care and designing rehab difficult. Certainly there is a blending of science with “art”/experience etc. Secondarily, other kinetic chain contributing factors, whether local to the scapulothoracic articulation, the thoracic spine, or even related to more distal/distant joints (especially when considering complex body movements such as overhead athlete mechanics or total body lifting/reaching ADL demands) have construct validity but often lack clear “evidence” in the literature. Scapular dyskinesis (SD) is one of those entities that has been identified but suffers from conflicting evidence as to its contribution and meaningfulness. Nevertheless, it may be one of those important factors for physicians to consider when prescribing physical therapy. Physicians must therefore consider how SD should be assessed in the office and how are therapists/athletic trainers addressing this through exercises. Kibler et al (2013) and others have identified abnormal scapular mechanics, or scapular dyskinesis, as a potential contributing factor. Kibler proposed a four pattern grading system with Pattern I being inferior angle prominence (tipping), Pattern II being medial border prominence (winging), Pattern III being early scapular elevation or excessive upward rotation (elevation), and Pattern IV being normal rhythm. In-office measurement of scapular dyskinesis can be done utilizing the scapular dyskinesis test (SDT) by Kibler. Arms are raised into flexion to maximum elevation and lowered 3-5x (adding 3-5# to each hand for up to 10 repetitions may be used to accentuate abnormal findings). Most often altered motion occurs during the eccentric descent. Ramiscal et al (Clin Shoulder & Elb 2022) showed grouping Patterns I-III as a “yes” and Pattern IV as a “no” resulted in intra-rater reliability kappa of 0.92 and inter-rater values of 0.85 for expert PT’s with asymptomatic individuals. This sort of chunking certainly reduces potential for reliability errors related to the challenge of ensuring consistency with limited/poor objective measurable means of determining when exactly a “winging” event at the respective scapular reference points has occurred. Break tests of flexion at 1300, abduction at 130-1500, and extension with arms at the side - looking for significant scapular movement should also be done. Kibler wisely has reminded (Int J Sports PT 2022) that lack of research agreement is, in part, related to multiple muscles attaching to the scapula allow for simultaneous and synchronous activation and stabilization during arm movement” causing variability in how individuals perform the same task, thoracic anatomy and varied muscle fiber orientation does not allow for single plane scapular movement - scapular motion involves complex translations/rotations w coupled muscle activation. He differentiates “neurologic” winging that remains disconnected through ascent and descent phases while “altered scapular positioning” is more so evident in descent phases. This differentiation on the surface would seem plausible, however, length-tension relationships, impacts of tissue tightness at different arm positions, and nuances of force couples may otherwise explain why the dyskinesis of abnormal scapular movement often occurs with eccentric phases only or more so than during concentric phases. Causal effects of scapular dyskinesis to pain and/or injury has not been clearly established Finally, Kibler also cautions that scapular dyskinesis is not a “diagnosis” in medical terms but an impairment therefore clinical utility, measuring diagnostic accuracy, is difficult and even inappropriate when no gold standard exists for comparison. Tangrood et al provide some evidence of an association of scapular dyskinesis reduction with improved shoulder function on self-report PSFS questionnaire responses. Repeated measures correlation coefficient showed 16% of the variability in PSFS score changes is explained by scapular dyskinesis changes. Strength of findings are weakened because confounding factors (symptom duration, physical demands, etc.) were not controlled for, especially the fact that 65% of those completing all testing participated in physical therapy (without known parameters) while 35% did not, creating a heterogeneous sample. Data was not analyzed for differences between these groups. Since blinding was not done the risk of examiner bias cannot be ruled out. Subtle dyskinesis made up 57% of the baseline group test findings. Measurement properties make determining change for these subjects more difficult to ascertain. Clinically speaking we find not only for a high percentage of shoulder pain patients that SD is present in some manner but that especially for many of the “failed PT” cases we see that this has not been addressed in rehab or maybe more importantly was only addressed with simple protraction exercises. One consideration is determining the authentic function of a muscle in ADL or sport. Again, we would caution that “because a muscle can doesn’t mean that it does” in regard to certain tests traditionally done or exercises utilized. During elevation function so often related to shoulder overloads and pain the scapula does need to upward rotate but that is coupled with posterior tipping/adduction especially for cocking positions of overhead athletics. The majority of SD exercises, owing to the classically viewed Serratus Anterior role in its capacity to protract the scapula, are most often pre-engaged or emphasized by intentional or forceful protraction. We would contend that in many typical ADL and athletic arm movements the authentic biomechanics necessary contradict coupling upward rotation with anterior tipping/abduction (ie protraction). Yes, that “works” and “fatigues” the Serratus Anterior, leading to a self-fulfilling prophecy of sorts that the exercise is effective. Functional biomechanics would seem to differ with that conclusion. In unique demands of pushing and throwing/propelling the arm and related objects forward certainly serratus function protracting the scapula is an absolute necessity. Relegating the majority of serratus anterior training for the sake of reducing SD though may be oversimplifying muscle function. Because it can doesn’t mean that it is…in this movement or case. Most testing and exercises related to SD factors (i.e. serratus and lower traps) tend to place the arm in longer lever positions. While this creates loads that may quickly increase lever arm effects and identify inadequacies it also risks eliciting pain in inflamed or damaged tissues that causes inhibition of otherwise potentially normal muscles. This is especially true for the “T” and “Y” tests and exercises so often done to address SD. We attempt to approach SD with a functional biomechanics mindset that we are seeking scapular integrity on the thoracic cage wall, with whatever posterior or anterior tipping required, and with adequate and not excessive upward rotational mechanics. While this is not easy to measure objectively or to isolate to singular muscles, due in part to the related pain generating tissue implications noted above, it leads to what we believe is a more authentic approach to scapular dyskinesis through “de-winger” thinking versus promotion of protraction dominated successful activation of serratus anterior that risks over stimulus of pec minor and what would otherwise be abnormal posturing. Kinetic chain biomechanics involving facilitation of thoracolumbar coupling, for example, into same sided rotation and side bending along with extension during cocking phases for overhead athletes, must be addressed if scapular positioning is to be optimized. This involves testing for and addressing Type I and Type II spinal mechanics along with other core and hip function. Too often we see patients having failed traditional PT approaches because classic exercises essentially rely on long lever arm loading into at-risk positions that cause pain of the irritated rotator cuff tendons or labral injury. Care must be taken in many cases of shoulder pain to customize loading of the Serratus Anterior and/or Lower Trapezius to achieve scapular integrity while avoiding symptom exacerbation. The case below involves a patient who had scapular dyskinesis as a contributing factor that required careful attention in testing and exercise. THE PEAK PERFORMANCE EXPERIENCE Holli said: “I had tried a couple of rounds of physical therapy elsewhere with not a lot of improvement in my shoulder after two years of pain. I’m so happy I was finally able to get my range of motion back and not be in pain all day!” History: 50 yr old female nurse fell in 2020 injuring her wrist and then developing L non-dominant shoulder pain. She had PT at a local hospital based outpatient clinic and transitioned to HEP but developed adhesive capsulitis and was then seen for PT several more months. Pt had a total of 4 corticosteroid injections. Now presenting two years after the original fall to address ongoing issues. Subjective: 6/10 max pain with reported function at 80%. Symptoms aggravated by elevation ADL, unable to sleep L sidelying, unable to do pushups and other fitness exercises, cannot kayak. Objective: (*=pain) Eval 5 mo DC ReEval Flexion AROM 1330 / 1660 1670 900 Abd IR AROM 130 / 300 350 900 Abd ER AROM 950 / 1200 NT Wall Serratus Anterior test L @ 4 / 5 with < moderate winging 5- / 5 Pec minor Scapular Retraction (hand @ head) Mod L tight < Min Flexion isometric 1.8 kg * (24%) 5.5 kg (74%) OH reaching (pressing) 5# 33x ( < 66%) 12# 12x (71%) 800 Abd w 900 ER test NT 8# 76% painfree Key Findings: At evaluation Pt had limited elevation AROM along with posterior RC/capsule restriction in Horz Abd and Abd IR. Isometric testing revealed weak/painful elevation and Abd ER along w weak Serratus Anterior during wall scapular integrity resistive test - showing scapular winging medial border. Thoracic L rotation was asymmetrically limited. Impingement / RC tendonitis special tests were (+). Treatment: Manual therapy emphasis to pec minor release, thoracic rotation mobilizations, and especially GH jt mob’s for all motions and capsular restrictions using holding style techniques vs std oscillation approach. Sustained stretching HEP initiated including for pec minor and thoracic L rotation combined with AROM integration drills immediately following. Scapular dyskinesis addressed with Serratus drills in both NWB and WB environments, focusing on “de-winging” emphasis of maintaining scapular integrity during related modified lever arm loaded LUE movements to optimize successful maintenance of scapular positioning…first accomplished in scapular plane and increasingly loaded in sagittal plane. These were eventually moved to upright 900 and then overhead demand positions to mimic authentic biomechanics necessary for ADL and fitness needs. Progressive shoulder/scapular PRE were done moving from BID high reps/low load toward eventual TIW 3x10-12 reps work and including functional considerations for fitness goal movements. Outcome: Pt happy with her progress and wanted to continue remaining work on her own with (I) HEP only. She had had challenges with regular attendance due to other life and work schedule demands. Holli rated function at 90% with Quick DASH 7% and Sport rating 24%. You can trust the Physical Therapists at PEAK PERFORMANCE to do a thorough evaluation, to search for related but underlying contributing factors to kinetic chain dysfunction, and to design exercise progressions that both respect tissue healing and creatively use biomechanics principles to prevent symptoms and optimize carryover to your patients' functional goals. Call us at 218-0240 to discuss your patient's specific needs. Peak Performance is just minutes away from your patients in Penfield, Fairport, Pittsford, Brighton, Rochester, and, of course, East Rochester. We promise Individualized, hands-on and biomechanically appropriate Physical Therapy for your patients. No "one-size-fits-all" approaches. We WILL go the extra mile and "dig deeper" to discover underlying causes for injury risk and delayed recovery using the most advanced Evidence Based methods available and, we’re able to make unique adjustments to exercise prescriptions to speed the return to function and to minimize or prevent symptoms from interfering. No surprises. No hassles. Confident your patient is in the right place. COME VISIT US AT 161 E Commercial St Just 1 mile off 490 exit (585) 218-0240 www.PeakPTRochester.com