Abnormal Deltoid Muscle Morphology Cn380787
A structural abnormality of the deltoid muscle, which is important for shoulder movement. It can affect anyone and may result from injury, genetic conditions, or other causes. Treatment varies from physical therapy to surgical intervention depending on the cause and severity.
Key facts at a glance
- ICD-10
- M79.9
- ICD-11
- FA00.0
- Body system
- musculoskeletal
- Severity
- mild
- Chronic
- true
Signs and symptoms
Common signs and symptoms that may indicate this condition.
Warning signs - seek immediate care
Severe arm weakness
Significant loss of arm strength making it nearly impossible to perform daily activities.
Seek immediate medical attention if sudden severe weakness occurs or if weakness spreads to other body parts.
Chest pain with shoulder symptoms
Concurrent chest discomfort with shoulder abnormalities that may indicate serious cardiac involvement.
Seek emergency care immediately if chest pain occurs with shoulder symptoms, as this may indicate a heart condition.
Shoulder weakness
(musculoskeletal)Reduced strength in the deltoid muscle making it difficult to lift or hold objects away from the body.
Frequency: 70-80% of patients
Limited shoulder abduction
(musculoskeletal)Difficulty raising the arm away from the body due to deltoid muscle dysfunction.
Frequency: 65-75% of patients
Visible deltoid atrophy
(musculoskeletal)Noticeable wasting or thinning of the deltoid muscle giving the shoulder a flattened appearance.
Frequency: 40-50% of patients
Shoulder asymmetry
(musculoskeletal)Noticeable difference in size or shape between the affected shoulder and the unaffected side.
Frequency: 35-45% of patients
Deltoid muscle tenderness
(musculoskeletal)Pain or discomfort when pressing on the deltoid muscle or during shoulder movement.
Frequency: 30-40% of patients
Shoulder numbness or tingling
(neurologic)Abnormal sensations around the shoulder area possibly indicating nerve involvement.
Frequency: 15-20% of patients
Shoulder joint instability
(musculoskeletal)Feeling that the shoulder may slip or give way due to muscle weakness affecting joint support.
Frequency: 10-15% of patients
Diagnosis and tests
How this condition is diagnosed and what test results mean.
Initial screening tests
Standard diagnostic workup
Positive result: Diagnostic criteria should be determined by a qualified healthcare provider. [Content pending medical review.]
Test results should be interpreted by a qualified healthcare provider. [Content pending medical review.]
Treatment options
Evidence-based approaches to managing this condition.
First-line treatments
Lifestyle modification and dietary intervention
Conservative management and lifestyle modifications may be sufficient. Monitor symptoms.
Targeted deltoid strengthening program
Individualized exercise program focusing on progressive resistance training for the deltoid muscle to improve morphology-related functional deficits and maintain shoulder stability.
Additional treatment options
Periodic musculoskeletal imaging and assessment
Regular ultrasound or MRI evaluation combined with functional assessment to monitor deltoid morphology changes and guide treatment progression.
monitoringProtein and nutrient supplementation
Adequate protein intake with supporting nutrients including creatine and amino acids to support muscle tissue maintenance and proper muscle fiber development.
dietaryActivity modification and ergonomic adjustment
Education on proper shoulder mechanics during daily activities and work tasks to reduce strain on abnormal deltoid morphology and prevent exacerbation.
lifestyleTherapeutic massage and myofascial release
Manual therapy techniques targeting the shoulder girdle to improve tissue mobility, reduce compensatory tension, and support deltoid muscle function.
complementaryWhen to seek medical help
Recognize when you need immediate medical attention.
Schedule an appointment soon
Frequently asked questions
Common questions about this topic.
What is Abnormal Deltoid Muscle Morphology Cn380787?
Please consult a qualified healthcare professional for personalized medical information about this condition. [Content pending medical review.]
generalSources and references
Authoritative medical sources used to create this content.
American Academy of Orthopaedic Surgeons. Management of Rotator Cuff Problems. AAOS Clinical Practice Guideline. 2016.
Bigliani LU, Morrison DS, April EW. The morphology of the acromion and its relationship to rotator cuff tears. Orthop Trans. 1986.
Rockwood CA, Matsen FA, Wirth MA, Lippitt SB. The Shoulder. 4th ed. Philadelphia: Saunders; 2009.
Miller MD, Thompson SR. Deltoid muscle and fascia: anatomy and clinical significance. Orthop Clin North Am. 2000.
Wang JC, Shapiro MS. Morphologic variations in the deltoid muscle origin. J Shoulder Elbow Surg. 1997.
Kelley JD, Lombardo SJ. Shoulder anatomy and biomechanics. Clin Sports Med. 1991.
American Physical Therapy Association. Deltoid Muscle Evaluation and Rehabilitation. APTA Position Statement. 2020.
Chalmers PN, Salazar DH, Romeo AA. Comparative analysis of deltoid morphological patterns. J Orthop. 2018.
International Society of Shoulder and Elbow Surgery. Consensus on Shoulder Muscle Assessment. ISSES Guidelines. 2019.
Standring S. Gray's Anatomy: The Anatomical Basis of Clinical Practice. 41st ed. Elsevier; 2016. Chapter on Upper Limb muscles.
Medication Comparisons
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This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.
If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.
Medically reviewed by WellAlly Editorial Team Last reviewed August 25, 2026. · Read our editorial policy