Winged scapula: From Origins to Solutions
Updated: Oct 17
Winged scapula is a relatively rare yet debilitating condition that significantly impacts upper limb function. It often stems from trauma, medical procedures, or idiopathic causes, leading to nerve dysfunction and subsequent paralysis of key stabilizing muscles, such as the serratus anterior, trapezius, or rhomboids.
This article explores Winged Scapula in-depth, covering its clinical anatomy, underlying causes, diagnostic methods, and treatment strategies. We will also highlight manual therapy techniques and targeted exercises designed to manage and correct this condition.
A winged scapula occurs when the shoulder blade (scapula) protrudes abnormally from the ribcage, disrupting both its alignment and function. This misalignment is typically due to nerve impairment affecting the surrounding muscles. Medial winging is commonly associated with serratus anterior paralysis, whereas lateral winging results from dysfunction of the trapezius and rhomboid muscles.
Article Index:
Winged Scapula Causes
Winged scapula can arise from several underlying factors, including:
Nerve Damage – Injury to the long thoracic nerve, which controls the serratus anterior muscle, is a primary cause of scapular winging (3). Damage to the spinal accessory nerve can result in trapezius paralysis, while dorsal scapular nerve dysfunction may lead to rhomboid muscle paralysis (14).
Trauma – Direct physical trauma to the shoulder or upper back can impair nerves or muscles, contributing to scapular instability and winging (14).
Iatrogenic Causes – Surgical procedures or other medical interventions may inadvertently injure nerves or muscles, increasing the risk of scapular winging (14).
Idiopathic Causes – In some cases, the exact cause remains unknown (14).
If left untreated, winged scapula can lead to chronic pain, restricted mobility, and impaired function, affecting both daily activities and athletic performance (6).
In many cases, serratus anterior paralysis resolves within 24 months, with 6–24 months of conservative care recommended to allow for natural recovery. If no improvement is observed within this period, surgical intervention may be considered (14).
Clinical Anatomy, Neurology, and Biomechanics of Scapular Winging
Scapular stabilization relies on the coordinated function of three key muscle groups: the serratus anterior, trapezius, and rhomboids (7). These muscles work synergistically to maintain proper scapular alignment and movement patterns. Their function is governed by distinct nerve innervations:
The long thoracic nerve controls the serratus anterior
The spinal accessory nerve innervates the trapezius
The dorsal scapular nerve supplies the rhomboids (8)
Biomechanics of Scapular Motion
Each of these muscles plays a distinct yet complementary role in scapular movement and stability:
Serratus Anterior – Responsible for protraction and upward rotation of the scapula, enabling overhead arm movements (5).
Trapezius – A large, superficial muscle divided into three functional sections:
Upper fibers – Assist in scapular elevation
Middle fibers – Contribute to scapular retraction
Lower fibers – Facilitate scapular depression (4)
Rhomboids – Primarily involved in scapular retraction and elevation, functioning in opposition to the serratus anterior (9).
A delicate balance between these muscles is essential for maintaining optimal scapular biomechanics and preventing dysfunction such as scapular winging. Any disruption in neuromuscular control, whether due to nerve injury or muscular imbalance, can lead to impaired movement, instability, and pain.
Clinical Manifestations
Patients with scapular winging may present with the following key signs and symptoms:
Medial Scapular Protrusion – The inner edge of the scapula visibly protrudes from the ribcage, often due to muscular imbalance or nerve dysfunction affecting the stabilizing muscles (1).
Restricted Shoulder Abduction – Patients may struggle to lift their arm overhead, indicating compromised function of the serratus anterior, trapezius, or rhomboid muscles or an underlying neurological impairment (3).
Pain and Discomfort – Many individuals experience pain or discomfort in the shoulder and upper back region, often due to abnormal scapular movement, increased strain on supporting muscles, or compensatory patterns (2).
Weakness in the Affected Arm – A noticeable loss of strength in the involved arm may suggest neuromuscular dysfunction, potentially resulting from nerve injury or muscle atrophy associated with scapular winging (10).
Winged scapula Diagnostic Assessment
The evaluation of scapular winging involves a comprehensive physical assessment, focusing on the following key components:
Muscle Strength Testing – Assessing the serratus anterior, trapezius, and rhomboids, along with surrounding musculature, to identify weaknesses or imbalances that may contribute to scapular instability (9).
Range of Motion (ROM) Analysis – Evaluating both active and passive movement of the shoulder joint to detect restrictions or deviations that indicate underlying scapular dysfunction (9).
Scapular Movement Observation – Analyzing scapular kinematics during functional tasks such as arm elevation or reaching to identify abnormal motion patterns indicative of scapular winging (9).
A detailed physical assessment is essential for accurately diagnosing winged scapula, determining the underlying cause, and guiding effective treatment strategies.
Shoulder Examination - Orthopaedic Testing
Video Introduction: "Welcome to our in-depth Shoulder Examination video, focused on orthopaedic testing. In this video, we will explore common causes of shoulder pain and demonstrate how to diagnose them using various orthopaedic examination techniques.
Throughout this video, we'll cover tests and assessments across various categories, including:
Inspection and Active Range of Motion
Rotator Cuff Anatomy and Tests (Full Can Test, Empty Can Test, External Rotators, and Internal Rotators)
Impingement Tests (Empty Can, Neer's Test, and Hawkins-Kennedy Test)
Serratus Anterior Test
Biceps Tendinopathy Tests (Speed's Test and Yergason's Test)
Frozen Shoulder Assessment
Acromioclavicular Joint Tests (Step Off Deformity, Scarf Test, and Painful Arc)
Shoulder Instability Tests (Sulcus Sign, Apprehension Test, and Relocation Test)
SLAP Lesion Tests (Speed's Test, O'Brien Test, and Crank's Test)"
Imaging
Beyond a physical examination, imaging and electrodiagnostic studies may be utilized to investigate underlying causes further or rule out alternative diagnoses:
Radiography (X-ray) – Used to assess bony structures of the shoulder girdle, helping identify potential fractures, dislocations, or skeletal abnormalities that could contribute to scapular winging (10).
Magnetic Resonance Imaging (MRI) – Provides detailed visualization of soft tissues, including muscles, ligaments, and nerves, allowing for the detection of structural damage, inflammation, or other pathological changes associated with winged scapula (10).
Nerve Conduction Studies (NCS) – Evaluates the functionality and integrity of the long thoracic nerve, spinal accessory nerve, and dorsal scapular nerve, helping to identify nerve injuries or impairments affecting scapular stability (10).
A comprehensive diagnostic approach, integrating clinical assessment, imaging, and nerve studies, is crucial for accurately diagnosing scapular winging and tailoring effective treatment strategies.
Differential Diagnosis
Several conditions may mimic or coexist with scapular winging, necessitating a thorough evaluation to ensure an accurate diagnosis:
Rotator Cuff Injuries – Damage to the rotator cuff tendons and muscles can lead to pain, weakness, and restricted shoulder mobility, which may be mistaken for scapular winging (11).
Shoulder Impingement Syndrome – Occurs when the rotator cuff tendons or subacromial bursa become compressed within the subacromial space, causing pain and functional limitations that can resemble scapular winging (11).
Thoracic Outlet Syndrome (TOS) – Compression of the neurovascular bundle within the thoracic outlet may lead to pain, weakness, and numbness in the shoulder, arm, and hand, potentially mimicking or coexisting with scapular winging (11).
Glenohumeral Joint Instability – Excessive joint laxity or instability can cause pain, restricted motion, and a shoulder sensation "giving way," which may be confused with scapular winging (12).
Scapulothoracic Bursitis – Inflammation of the scapulothoracic bursa (between the scapula and ribcage) can lead to pain and discomfort during scapular movement, making it difficult to differentiate from scapular winging (13).
A comprehensive assessment is essential to distinguish scapular winging from these conditions, ensuring targeted and effective treatment.
Manual Therapy and Exercise
Manual therapy plays a crucial role in addressing scapular winging, utilizing targeted techniques to restore mobility, reduce pain, and enhance function. Key areas of focus include:
1. Nerve Entrapments
Motion Specific Release (MSR) Mobilizations – These techniques help relieve nerve entrapments affecting the long thoracic, spinal accessory, and dorsal scapular nerves, which are commonly implicated in scapular winging (14).
2. Soft Tissue Restrictions
Myofascial Release – Soft tissue mobilization techniques help release adhesions and tension in key stabilizing muscles, including the serratus anterior, trapezius, rhomboids, subscapularis, and pectoral muscles (12).
Trigger Point Therapy – Manual pressure or dry needling is used to deactivate hyperirritable nodules (trigger points) that contribute to pain and dysfunction in scapular winging cases (15).
3. Osseous Restrictions in the Thoracic Region
Joint Mobilization – Targeted mobilization of the thoracic spine, sternoclavicular joint, and acromioclavicular joint can help restore normal scapular positioning and movement (16).
Chiropractic Manipulation – High-velocity, low-amplitude (HVLA) adjustments of restricted spinal or rib articulations may enhance thoracic mobility and overall scapular biomechanics (16).
A comprehensive approach, integrating manual therapy with corrective exercises, is essential for improving scapular stability and function, ultimately reducing the impact of scapular winging on movement and daily activities.
Video Demonstration
MSR Fascial Expansion:
Utilizing fascial expansions in managing scapular winging presents an effective strategy that merges contemporary insights in fascia, kinetic chain relationships, and core principles of acupuncture or traditional Chinese medicine
Self-Care for Shoulder Pain: Acupressure & Fascial Manipulation
Applying acupressure to key points such as LI 15, SI 10, LI 11, and GB 34 can significantly alleviate shoulder pain, stiffness, and tension.
Exercises
Focused stretches and strength-building exercises can help manage and prevent winged scapula. This video tutorial will examine evidence-supported exercises and therapeutic approaches to alleviate winged scapula symptoms and strengthen the periscapular muscles. By integrating a comprehensive knowledge of the musculoskeletal anatomy and biomechanics at play, you will gain insight into how these exercises can enhance postural alignment, alleviate pain, and boost functional mobility.
Winged Scapula - Exercise and Treatment Video
In this video, we'll delve into the world of winged scapula, an unusual but impactful condition that significantly impacts upper limb function. Various factors, including trauma, medical procedures, or unidentified causes, can lead to nerve damage and paralysis of the serratus anterior, trapezius, or rhomboid muscles.
Conclusion
Winged scapula is a rare but debilitating condition affecting shoulder stability and function. It often results from nerve dysfunction, trauma, or surgical complications and requires a thorough assessment for accurate diagnosis.
Effective management combines manual therapy, corrective exercises, and, if needed, surgical intervention. Techniques like Motion Specific Release (MSR), myofascial release, and targeted rehabilitation can restore function and reduce pain.
Early intervention is key. With structured conservative care, most cases improve within 6–24 months, while persistent cases may require surgery. A comprehensive, evidence-based approach ensures optimal recovery and long-term mobility.
References:
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Kibler WB. The role of the scapula in athletic shoulder function. Am J Sports Med. 1998;26(2):325-337.
Wiater JM, Flatow EL. Long thoracic nerve injury. Clin Orthop Relat Res. 1999;(368):17-27.
Kuhn JE, Plancher KD, Hawkins RJ. Scapular winging. J Am Acad Orthop Surg. 1995;3(6):319-325.
Kibler WB, McMullen J. Scapular dyskinesis and its relation to shoulder pain. J Am Acad Orthop Surg. 2003;11(2):142-151.
Ludewig PM, Reynolds JF. The association of scapular kinematics and glenohumeral joint pathologies. J Orthop Sports Phys Ther. 2009;39(2):90-104.
Kibler WB, Sciascia A. Evaluation and management of scapular dysfunction. Sports Med Arthrosc Rev. 2012;20(1):39-48.
LaBan MM, Taylor RS, Weir SK. Scapular winging: a disorder of the long thoracic nerve producing scapular dyskinesis. Am J Phys Med Rehabil. 2004;83(3):213-216.
Page P, Frank CC, Lardner R. Assessment and Treatment of Muscle Imbalance: The Janda Approach. Champaign, IL: Human Kinetics; 2010.
Ajimsha MS, Binsu D, Chithra S. Effectiveness of myofascial release in the management of chronic low back pain in nursing professionals. J Bodyw Mov Ther. 2015;19(2):173-181.
Kibler WB, Sciascia A, Wilkes T. Scapular dyskinesis and its relation to shoulder injury. J Am Acad Orthop Surg. 2012;20(6):364-372.
Hartz CR, Linscheid RL, Gramse RR, Daube JR. The pronator teres syndrome: compressive neuropathy of the median nerve. J Bone Joint Surg Am. 1981;63(6):885-890.
Dommerholt J, Fernandez-de-las-Penas C. Trigger Point Dry Needling: An Evidence and Clinical-Based Approach. Edinburgh: Churchill Livingstone; 2013.
Vicenzino B, Hing W, Rivett D, Hall T. Mobilisation with Movement: The Art and the Science. Chatswood, NSW: Elsevier Australia; 2011.
Souza TA. Differential Diagnosis and Management for the Chiropractor: Protocols and Algorithms. 5th ed. Burlington, MA: Jones & Bartlett Learning; 2015.
Abelson B, Abelson K, Mylonas E. A Practitioner's Guide to Motion Specific Release, Functional, Successful, Easy to Implement Techniques for Musculoskeletal Injuries. 1st ed. Rowan Tree Books; 2018.
DR. BRIAN ABELSON, DC. - The Author
Dr. Brian Abelson is a chiropractor, author, and educator with more than 30 years of clinical experience in musculoskeletal care, rehabilitation, and sports performance. His educational work focuses on musculoskeletal conditions, human movement, sports biomechanics, and evidence-informed approaches to treatment and rehabilitation.
He is the developer of Motion Specific Release (MSR) and Clinical Director of Kinetic Health in Calgary, Alberta, Canada.
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