Musculoskeletal Imaging

What Is the Next Step for Suspected Adhesive Capsulitis After Normal X-Rays?

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What Is the Next Step for Suspected Adhesive Capsulitis After Normal X-Rays?

A 54-year-old patient with a history of type 2 diabetes presents to your clinic with six months of progressively worsening right shoulder pain and stiffness. They can no longer reach into a high cabinet or fasten a seatbelt without severe pain. Your physical exam reveals a global reduction in both active and passive range of motion, particularly external rotation. Initial radiographs of the shoulder are unremarkable, showing no fracture, dislocation, or significant glenohumeral osteoarthritis. Your leading diagnosis is adhesive capsulitis, or “frozen shoulder.” The immediate clinical question is what to order next to confirm the diagnosis and guide treatment. According to the American College of Radiology (ACR) Appropriateness Criteria, an ‘Image-guided anesthetic +/- corticosteroid injection’ is a Usually Appropriate next step, serving a dual diagnostic and therapeutic role.

Who Fits This Clinical Scenario?

This guidance is for patients with chronic shoulder pain (typically lasting more than six weeks) where the clinical suspicion for adhesive capsulitis is high and initial radiographs are negative or inconclusive. The classic presentation includes an insidious onset of pain followed by a progressive, global loss of both active and passive glenohumeral motion. This patient profile often includes individuals between 40 and 60 years of age, with a higher prevalence in women and those with endocrine disorders like diabetes mellitus or thyroid disease.

It is critical to distinguish this scenario from others that may present similarly but require a different diagnostic approach:

  • Suspected Rotator Cuff Disorders: Patients may have pain and weakness with active motion (e.g., abduction), but passive range of motion is often preserved, which contrasts with the global restriction seen in adhesive capsulitis.
  • Suspected Labral Pathology or Instability: This is more common in younger, athletic patients and often involves a history of trauma, with symptoms of clicking, popping, or a sensation of the shoulder “giving out.”
  • Demonstrated Osteoarthritis on Radiographs: If the initial X-rays already show significant joint space narrowing and osteophytes, the diagnosis is established, and the subsequent imaging workup follows a different pathway focused on assessing the severity of arthritis.

This article specifically addresses the patient whose primary feature is stiffness after normal initial imaging.

What Diagnoses Are You Working Up in This Scenario?

When a patient presents with a stiff, painful shoulder and normal radiographs, your differential diagnosis is centered on conditions affecting the joint capsule and surrounding soft tissues. The choice of the next study is designed to confirm or exclude these possibilities.

Adhesive Capsulitis (Frozen Shoulder): This is the primary diagnosis to confirm. It is a clinical diagnosis characterized by the thickening and contracture of the glenohumeral joint capsule, leading to pain and a profound loss of motion. Imaging is used to corroborate the clinical findings and, importantly, to rule out other pathologies that can mimic its presentation.

Severe Subacromial-Subdeltoid Bursitis: While typically causing impingement symptoms, severe, chronic inflammation of the bursa can lead to significant pain and guarding, resulting in a secondary stiffness that can be difficult to distinguish from true capsulitis on physical exam alone.

Rotator Cuff Tendinopathy or Occult Tear: A full-thickness rotator cuff tear not suspected clinically can sometimes lead to profound inflammation and secondary stiffness. Similarly, severe tendinosis without a frank tear can cause significant pain that limits motion, mimicking a primary capsular process.

Early Glenohumeral Osteoarthritis: In its early stages, osteoarthritis may not produce definitive findings on plain radiographs. The patient may experience stiffness and pain from cartilage loss and synovitis before significant joint space narrowing becomes apparent on X-ray.

Why Is an Image-Guided Injection or MRI the Recommended Next Step?

For a patient with suspected adhesive capsulitis after normal radiographs, the ACR guidelines highlight two procedures as Usually Appropriate, each with a distinct role. The choice between them often depends on whether the immediate goal is purely diagnostic or combined diagnostic and therapeutic.

1. Image-guided anesthetic +/- corticosteroid injection shoulder or surrounding structures (Rating: Usually Appropriate): This procedure is unique in that it offers both immediate diagnostic information and therapeutic relief. Under fluoroscopic or ultrasound guidance, a needle is placed into the glenohumeral joint. The injection of a local anesthetic that provides rapid pain relief and a temporary improvement in range of motion strongly supports the joint as the primary pain generator, consistent with adhesive capsulitis. The co-administration of a corticosteroid provides a potent anti-inflammatory effect to begin treatment. This approach is efficient, combining diagnosis and therapy into a single intervention.

2. MRI shoulder without IV contrast (Rating: Usually Appropriate): As a purely diagnostic study, a non-contrast MRI is the most effective modality for visualizing the soft tissue abnormalities of adhesive capsulitis. It carries no radiation risk (O 0 mSv). Key findings include thickening of the joint capsule, particularly in the axillary pouch and rotator interval, and enhancement after contrast (though a non-contrast study is typically sufficient and rated equally). MRI is also excellent for ruling out the main mimics, such as occult full-thickness rotator cuff tears or significant tendinopathy.

Lower-Rated Alternatives:

  • US shoulder (Rating: May be appropriate, Disagreement): Ultrasound can show some signs of adhesive capsulitis, such as thickening of the coracohumeral ligament or restricted motion of the infraspinatus tendon during dynamic assessment. However, its ability to evaluate the entire joint capsule is limited, and the findings can be subtle and highly operator-dependent, leading to disagreement on its appropriateness.
  • CT arthrography shoulder (Rating: Usually not appropriate): This invasive study involves injecting contrast directly into the joint and using CT imaging. While it can demonstrate a reduced joint volume characteristic of adhesive capsulitis, it exposes the patient to significant radiation (☢☢☢☢ 10-30 mSv) and offers no significant diagnostic advantage over a non-invasive MRI for this clinical question.

Once you’ve decided on an MRI, our protocol guide covers the technique and reading principles in detail: MRI Shoulder Without Contrast.

What’s Next After Your Study? Downstream Workflow

The results of your chosen study will guide the subsequent management plan. The workflow branches depending on whether you started with a diagnostic/therapeutic injection or a purely diagnostic MRI.

If you performed an image-guided injection:

  • Positive Response: If the patient experiences significant pain relief from the anesthetic and subsequent improvement from the steroid, the diagnosis of adhesive capsulitis is functionally confirmed. The next step is to initiate a rigorous physical therapy program to capitalize on the reduced pain and restore range of motion. No further imaging is typically needed.
  • Negative Response: If the patient has little to no relief from an accurately placed intra-articular injection, the diagnosis of adhesive capsulitis is less likely. This should prompt a re-evaluation of the differential. The logical next step is an MRI shoulder without IV contrast to search for an alternative cause, such as a rotator cuff tear or other pathology.

If you performed an MRI first:

  • Findings Confirm Adhesive Capsulitis: If the MRI shows classic capsular thickening and enhancement, the diagnosis is confirmed. The patient can be referred for physical therapy and an image-guided corticosteroid injection, now for purely therapeutic purposes.
  • MRI Is Negative or Shows an Alternative Diagnosis: If the MRI is normal or reveals an unexpected finding (e.g., a full-thickness rotator cuff tear, labral pathology), the clinical workflow pivots. The patient should be managed according to the new diagnosis, which may involve referral to orthopedic surgery. This highlights the value of MRI in clarifying the diagnosis when the clinical picture is ambiguous.

Pitfalls to Avoid (and When to Get Help)

In the workup of suspected adhesive capsulitis, several common pitfalls can delay diagnosis or lead to suboptimal outcomes.

  • Misinterpreting Stiffness: Be cautious not to attribute all shoulder stiffness to adhesive capsulitis. A locked posterior shoulder dislocation can be missed on an AP radiograph and presents with a block to external rotation. Always ensure an adequate radiographic series, including an axillary or Velpeau view if there is any suspicion.
  • Overlooking Red Flags: Pain that is constant, worse at night regardless of position, or associated with systemic symptoms like fever or weight loss is atypical for adhesive capsulitis. These red flags warrant a more aggressive workup to rule out infection or malignancy.
  • Underutilizing Physical Therapy: An injection provides a window of opportunity by reducing pain and inflammation, but it is not a cure. The cornerstone of recovery is a dedicated physical therapy regimen focused on stretching and range of motion.

If a patient fails to improve after an accurately placed injection and a dedicated course of physical therapy, or if imaging reveals complex pathology, escalation to an orthopedic surgery or sports medicine specialist is the appropriate next step.

Related ACR Topics and Tools

Navigating imaging choices requires reliable, scenario-specific data. For a broader overview of all clinical variants related to shoulder pain, see our parent guide. For tools to help with ordering and patient communication, see the resources below.

Frequently Asked Questions

Why is an injection recommended over a purely diagnostic test like an MRI?

The image-guided injection is rated ‘Usually Appropriate’ because it serves a dual purpose. It provides immediate diagnostic feedback—if an anesthetic in the joint relieves the pain, it confirms the pain is intra-articular. It also initiates treatment with a corticosteroid. This combined diagnostic and therapeutic approach can be more efficient than a purely diagnostic MRI, which would still require a separate procedure for treatment.

What if my patient is diabetic and concerned about a corticosteroid injection?

This is a valid concern, as corticosteroids can cause transient hyperglycemia. The risks and benefits should be discussed with the patient, including a plan for more frequent blood glucose monitoring for 1-2 days post-injection. In some cases, an anesthetic-only injection can be performed for purely diagnostic purposes, or the steroid dose can be adjusted. The decision should be shared between the clinician and the patient.

Is an MR arthrogram better than a non-contrast MRI for adhesive capsulitis?

No, for this specific question, a non-contrast MRI is sufficient and rated ‘Usually Appropriate.’ An MR arthrogram, rated ‘May be appropriate,’ involves injecting contrast into the joint. While it definitively shows the reduced joint volume of a contracted capsule, it is an invasive procedure and a non-contrast MRI can typically visualize the key finding of capsular thickening without an injection.

Can ultrasound diagnose adhesive capsulitis?

Ultrasound is rated ‘May be appropriate (Disagreement)’ by the ACR. While an experienced operator can identify findings like coracohumeral ligament thickening or synovitis in the rotator interval, it is highly operator-dependent and cannot visualize the entire joint capsule as effectively as an MRI. Therefore, while it can be a useful tool in some settings, MRI remains the more comprehensive and reliable non-invasive diagnostic test.

My patient’s initial radiographs were normal. Is there any reason to get more X-rays?

In this specific scenario, the ACR rates ‘Radiography shoulder additional views’ as ‘Usually not appropriate.’ Once osteoarthritis, fracture, and dislocation have been reasonably excluded by the initial series, repeat or additional views offer very low diagnostic yield for a soft-tissue process like adhesive capsulitis. The workflow should advance to cross-sectional imaging or a diagnostic injection.

Reviewed by Pouyan Golshani, MD, Interventional Radiologist — May 29, 2026