Understanding Arthritis of the Main Shoulder Joint
The glenohumeral joint is the main ball-and-socket joint of the shoulder. When the cartilage lining this joint wears down, it causes deep shoulder pain and progressive stiffness. Unlike AC joint or rotator cuff problems, glenohumeral arthritis affects the core joint itself.
Causes
Glenohumeral arthritis typically develops from:
Age-related cartilage breakdown.
A prior shoulder injury or dislocation.
Long-standing, large rotator cuff tears that alter joint mechanics over time ("cuff tear arthropathy").
Inflammatory arthritis, like rheumatoid arthritis.
Avascular necrosis (loss of blood supply to the shoulder bone).
Symptoms
Common symptoms include:
Deep, aching shoulder pain.
Stiffness and reduced range of motion, especially with rotating the arm outward.
Pain with overhead reaching.
Night pain that disrupts sleep.
A grinding or grating sensation (crepitus) with movement.
Seek prompt medical care if: Shoulder pain follows a fall or injury with sudden inability to lift the arm, or comes with fever, redness, and warmth over the joint. Left shoulder or arm pain with chest pressure, shortness of breath, or sweating needs emergency care.
Imaging Studies to Consider
Imaging confirms the diagnosis and helps plan treatment:
X-ray of the shoulder (multiple views) is the primary test, showing joint space narrowing and bone spurs.
MRI of the shoulder is used to evaluate the rotator cuff and plan for potential surgery.
Physical Therapy, Home Exercise & Other Conservative Techniques
Before considering injections or other procedures, several non-invasive approaches are well studied and usually tried first:
Physical Therapy
Range-of-motion preservation exercises.
Rotator cuff and periscapular strengthening.
Manual therapy to help maintain joint mobility.
Home Exercise Program
Pendulum exercises.
Isometric strengthening exercises.
A daily range-of-motion maintenance routine.
Other Studied Techniques
Activity modification to reduce joint-loading activities.
Heat before activity, ice afterward.
Interventional Treatment Options
Treatment is typically staged based on severity:
Intra-articular corticosteroid injection: Injected into the glenohumeral joint to reduce inflammation and pain.
Suprascapular nerve block: Targets a major sensory nerve supplying the shoulder joint, providing significant pain relief with a favorable safety profile.
Platelet-rich plasma (PRP) or orthobiologics: Better supported than its reputation suggests: in the RCTs available, PRP outperformed corticosteroid injection over the long term, making it a reasonable option for patients who want to delay surgery or repeated steroid injections. Typically given as a series of 2–3 injections.
Acupuncture: A technique that may provide additional relief for chronic shoulder pain.
Surgical referral: For severe arthritis unresponsive to conservative care, referral for total shoulder or reverse shoulder replacement may offer the most durable relief.
Neuromodulation: Spinal Cord & Peripheral Nerve Stimulation
For chronic shoulder pain that persists, neuromodulation targeting the suprascapular nerve is a well-established, non-opioid option:
Peripheral nerve stimulation (PNS) of the suprascapular nerve: A small electrode calms pain signals from the shoulder joint; particularly useful for those who aren't candidates for surgery or have persistent pain after joint replacement.
How Strong Is the Evidence?
A summary of the evidence supporting key treatments for glenohumeral joint arthritis:
How to read this: Strong means consistent results from multiple high-quality studies. Moderate means generally favorable results with some limitations. Mixed or early means results so far are inconsistent or still emerging. Limited means few or lower-quality studies; these options can still be considered in select cases following a discussion with your healthcare provider.
Intra-articular corticosteroid injection: Moderate evidence.
Suprascapular nerve block: Moderate evidence.
Acupuncture: Moderate evidence.
Platelet-rich plasma (PRP): Strong evidence.
Evidence reviewed November 2026. These ratings summarize published research and major medical society guidelines available at that time. Research continues to evolve, and we will go over the most current evidence for your situation at your visit.
Pain Psychology Techniques
Chronic shoulder pain affects sleep and daily function. Pain psychology techniques support comprehensive care:
Cognitive behavioral therapy (CBT) for pain.
Graded activity pacing helps maintain function without overloading the joint.
Mindfulness-based stress reduction and relaxation training.
Non-Opioid Medication Options
Non-opioid medications are effective for glenohumeral arthritis pain:
First-line options
Acetaminophen is often tried first for mild pain.
Oral NSAIDs (ibuprofen, naproxen, meloxicam) are effective but used cautiously in patients with kidney, heart, or GI concerns.
For chronic pain
Duloxetine is an SNRI antidepressant approved for chronic musculoskeletal pain.
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Talk With Us About Your Options
Call 650-507-4113 or send us a message to schedule a consultation at our Daly City, Los Altos, or Stockton office. We will review what may be causing your pain and walk through the risks, benefits, and alternatives of each option with you.
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This information is provided for general patient education and does not replace individualized medical advice. Please discuss your specific symptoms, diagnosis, and treatment options with your pain management physician.
