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Infection of scapula — Clinical Guidelines

Overview

Snapping scapula syndrome (SSS) is a rare musculoskeletal disorder characterized by crepitus and pain arising from abnormal gliding movements between the scapula and the thoracic wall. It primarily affects young, active individuals engaged in repetitive overhead activities, leading to significant functional impairment and reduced quality of life. The condition can be debilitating, often necessitating intervention when conservative measures fail. Understanding and managing SSS effectively is crucial in orthopedic practice to prevent chronic disability and optimize patient outcomes 4 7.

Pathophysiology

The pathophysiology of snapping scapula syndrome involves multiple factors contributing to the disruption of normal scapulothoracic mechanics. Key contributors include scapular dyskinesis, where abnormal movement patterns of the scapula during shoulder elevation lead to friction against the chest wall. Repetitive microtrauma can result in bursitis, inflammation of the scapulothoracic bursa, further exacerbating symptoms 4 7. Additionally, anatomic variations such as irregularities in the shape of the scapula or soft tissue masses can interfere with smooth gliding, creating a "snapping" sensation. Over time, these mechanical stresses can lead to chronic inflammation and pain, impacting shoulder function 7.

Epidemiology

Snapping scapula syndrome has a relatively low incidence, making precise prevalence figures challenging to ascertain. It predominantly affects young adults, typically between the ages of 15 and 35 years, with a slight male predominance observed in some studies. The condition is more common in individuals involved in sports requiring repetitive overhead motions, such as swimmers, volleyball players, and baseball pitchers. Geographic distribution does not appear to significantly influence incidence, but occupational factors and repetitive activities are notable risk factors. Trends suggest an increasing awareness and diagnosis due to heightened clinical scrutiny and improved imaging techniques, though robust longitudinal data are limited 4 5.

Clinical Presentation

Patients with snapping scapula syndrome commonly present with localized pain and a palpable or audible snapping sensation in the upper posterior chest or shoulder region, particularly during shoulder elevation and rotation movements. Symptoms often worsen with activities like reaching overhead, lifting, or twisting motions. Typical presentations include:

Pain exacerbated by overhead activities

Crepitus or snapping sensation

Limited range of motion in the shoulder

Localized tenderness over the scapula

Red-flag features that warrant further investigation include persistent pain unresponsive to conservative treatment, significant functional impairment, or signs of systemic illness, which may indicate complications or other underlying conditions 4 7.

Diagnosis

Diagnosis of snapping scapula syndrome involves a comprehensive clinical evaluation followed by targeted diagnostic imaging and, in some cases, arthroscopic evaluation. The diagnostic approach includes:

Clinical History and Physical Examination: Detailed history focusing on activity patterns, onset, and progression of symptoms. Physical examination should assess scapular movement, palpate for tenderness, and reproduce the snapping sensation.

Imaging Studies:

- Plain X-rays: Often normal but can reveal bony anomalies or degenerative changes. - MRI: Useful for visualizing soft tissue abnormalities, bursitis, or other periscapular lesions. - Ultrasound: Can identify bursal inflammation and other soft tissue issues.

Arthroscopy: In cases where conservative management fails, arthroscopic evaluation can confirm the diagnosis and rule out other intra-articular shoulder pathologies.

Specific Criteria and Tests:

Clinical Criteria:

- Pain and snapping sensation exacerbated by shoulder elevation and rotation. - Positive scapular rhythm abnormalities on physical exam.

Imaging Criteria:

- MRI showing bursal thickening or inflammation. - Ultrasound evidence of bursal effusion or soft tissue masses.

Differential Diagnosis:

- Rotator Cuff Tears: Pain localized to the shoulder joint, weakness, and positive impingement tests. - Scapulohumeral Rhythm Disorders: Often associated with shoulder instability or muscle imbalances. - Thoracic Outlet Syndrome: Symptoms may include numbness, tingling in the arm and hand, and pain radiating down the arm. - Costoclavicular Syndrome: Pain and limited mobility in the shoulder and neck region, often with a palpable clavicle-rib compression 4 7.

Management

Nonoperative Management

Nonoperative management is typically the first line of treatment for snapping scapula syndrome, aiming to alleviate symptoms and improve function through conservative interventions:

Activity Modification: Avoidance of provocative activities, gradual return to low-impact exercises.

Physical Therapy: Focus on scapular stabilization exercises, postural correction, and stretching to improve scapulothoracic mechanics.

Anti-inflammatory Medications: Nonsteroidal anti-inflammatory drugs (NSAIDs) to reduce inflammation and pain.

Corticosteroid Injections: Local injections into the scapulothoracic bursa to manage bursitis and inflammation.

Specific Interventions:

Exercise Program: Scapular retraction, depression, and stabilization exercises.

Medication: NSAIDs (e.g., ibuprofen 400 mg three times daily for 1-2 weeks).

Injection Therapy: Corticosteroid injection (e.g., 40 mg triamcinolone acetonide).

Operative Management

When nonoperative measures fail, surgical intervention may be considered:

Arthroscopic Decompression: Removal of inflamed bursa or loose bodies, and release of tight structures.

Open Resection: Superomedial border resection of the scapula for persistent cases.

Scapulothoracic Bursectomy: Open surgical excision of the bursa to address chronic bursitis.

Specific Procedures:

Arthroscopic Decompression: Performed under general anesthesia; involves bursectomy and release of tight tissues.

Open Resection: Typically done in beach-chair position; involves resection of the superomedial border of the scapula.

Post-Operative Care: Immobilization with a sling for 2-4 weeks, followed by gradual physical therapy to restore range of motion and strength.

Contraindications:

Severe systemic illness

Active infection

Inadequate response to conservative management for an extended period

Complications

Common complications of both nonoperative and operative management include:

Nonoperative:

- Inadequate symptom relief leading to prolonged disability. - Potential side effects of long-term NSAID use (e.g., gastrointestinal issues).

Operative:

- Infection - Nerve injury (e.g., long thoracic nerve) - Persistent pain or recurrence - Scapular winging

Referral to a specialist is warranted if complications such as persistent pain, functional impairment, or signs of infection arise post-surgery 4 6 11.

Prognosis & Follow-up

The prognosis for snapping scapula syndrome varies based on the severity and duration of symptoms before treatment. Early intervention with conservative measures often yields favorable outcomes, with many patients experiencing significant symptom relief and functional improvement. Prognostic indicators include:

Response to Initial Treatment: Patients responding well to physical therapy and activity modification tend to have better outcomes.

Duration of Symptoms: Shorter duration before diagnosis and treatment generally correlates with better recovery.

Follow-up Intervals:

Initial follow-up: 4-6 weeks post-treatment to assess response and adjust management.

Subsequent follow-ups: Every 3-6 months for the first year, then annually to monitor long-term outcomes and address any recurrence.

Special Populations

Pediatrics

In children and adolescents, snapping scapula syndrome is less common but can occur, often due to growth-related anatomic variations or repetitive sports activities. Management focuses on conservative measures, with surgical intervention reserved for severe, refractory cases. Early intervention and tailored physical therapy are crucial 5.

Elderly

Elderly patients may present with similar symptoms but often have additional comorbidities affecting treatment options. Conservative management is typically preferred, with careful consideration of physical therapy intensity and medication use due to potential interactions with existing conditions 4.

Key Recommendations

Initiate Conservative Management: Start with activity modification, physical therapy, and NSAIDs for symptom relief 4 7.

Consider Corticosteroid Injections: For refractory bursitis, corticosteroid injections can be effective 4 7.

Refer for Arthroscopic Intervention: If symptoms persist beyond 3-6 months, consider arthroscopic decompression or bursectomy 6 11.

Evaluate for Underlying Pathologies: Rule out rotator cuff injuries or thoracic outlet syndrome through imaging and clinical evaluation 4 7.

Monitor Response to Treatment: Regular follow-ups to assess symptom improvement and adjust management accordingly 4 7.

Special Considerations for Pediatric Patients: Tailor conservative approaches to age-appropriate activities and physical therapy 5.

Conservative Approach for Elderly Patients: Focus on low-impact exercises and cautious use of medications 4.

Surgical Referral for Refractory Cases: Open resection may be necessary for persistent symptoms unresponsive to less invasive treatments 10 11.

Long-term Follow-up: Schedule regular assessments to monitor for recurrence and functional outcomes 4 7.

Multidisciplinary Care: Involve physical therapists and orthopedic specialists for comprehensive management 4 7.

(Evidence: Strong 4 7, Moderate 5 6, Weak 11, Expert opinion 10)

References

1 Proffen BL, Perrone GS, Fleming BC, Sieker JT, Kramer J, Hawes ML et al.. Electron beam sterilization does not have a detrimental effect on the ability of extracellular matrix scaffolds to support in vivo ligament healing. Journal of orthopaedic research : official publication of the Orthopaedic Research Society 2015. link 2 Rupp MC, Rutledge JC, Apostolakos JM, Dornan GJ, Quinn PM, Horan MP et al.. Preoperative patient factors that predict achieving the minimal clinically important difference following arthroscopic treatment of snapping scapula syndrome. Journal of shoulder and elbow surgery 2024. link 3 Schoch BS, Taba H, Aibinder W, King JJ, Wright TW. Effect of Reverse Shoulder Arthroplasty Lateralization Design on Scapular Notching: A Single-Surgeon Experience. Orthopedics 2020. link 4 Wang ML, Miller AJ, Ballard BL, Botte MJ. Management of Snapping Scapula Syndrome. Orthopedics 2016. link 5 Haus B, Nasreddine AY, Suppan C, Kocher MS. Treatment of Snapping Scapula Syndrome in Children and Adolescents. Journal of pediatric orthopedics 2016. link 6 Merolla G, Cerciello S, Paladini P, Porcellini G. Scapulothoracic arthroscopy for symptomatic snapping scapula: a prospective cohort study with two-year mean follow-up. Musculoskeletal surgery 2014. link 7 Gaskill T, Millett PJ. Snapping scapula syndrome: diagnosis and management. The Journal of the American Academy of Orthopaedic Surgeons 2013. link 8 Garg T, Singh O, Arora S, Murthy R. Scaffold: a novel carrier for cell and drug delivery. Critical reviews in therapeutic drug carrier systems 2012. link 9 Kanetaka H, Shimizu Y, Kudo TA, Zhang Y, Kano M, Sano Y et al.. New internalized distraction device for craniofacial plastic surgery using Ni-free, Ti-based shape memory alloy. The Journal of craniofacial surgery 2010. link 10 Ross AE, Owens BD, DeBerardino TM. Open scapula resection in beach-chair position for treatment of snapping scapula. American journal of orthopedics (Belle Mead, N.J.) 2009. link 11 Nicholson GP, Duckworth MA. Scapulothoracic bursectomy for snapping scapula syndrome. Journal of shoulder and elbow surgery 2002. link

Infection of scapula