Frozen shoulder, or adhesive capsulitis, is a painful shoulder condition in which the glenohumeral capsule becomes inflamed, fibrotic and contracted, progressively limiting both active and passive motion. Loss of passive external rotation is particularly important, because rotator cuff pain often limits active motion while passive motion stays better preserved. At Novo Soft Tissue in the Denver Tech Center, we start with the examination to determine whether the shoulder truly has a capsular pattern, and whether the presentation is pain-dominant, stiffness-dominant or another shoulder diagnosis entirely. Depending on the findings, treatment may involve mobility and loading, manual treatment, shockwave, medical injection or hydrodilatation, imaging or referral.
Background
Is Adhesive Capsulitis Really a Fibrotic Condition?
Yes. Frozen shoulder is one of the clearest examples of a true fibrotic contracture in musculoskeletal medicine. Human tissue studies demonstrate fibroblast activity, collagen deposition and capsular contracture. But "adhesive capsulitis" should not be interpreted as a collection of superficial scar bands that can simply be palpated or mechanically broken apart.
Human capsule biopsies have shown active fibroblasts, new type III collagen deposition and inflammatory and fibrotic signaling. Surgical studies of refractory cases describe contracture of the coracohumeral ligament and rotator interval. The best current model is fibroinflammation followed by abnormal matrix remodeling and capsular contracture, not simply "tight tissue."
What Makes Frozen Shoulder Different From Ordinary Shoulder Pain?
The central finding is restriction of both active and passive glenohumeral motion: the shoulder does not move fully even when the examiner moves it. Loss of passive external rotation is one of the most useful clinical clues, especially when it accompanies broader restriction of passive glenohumeral motion. It is not a standalone test, because glenohumeral arthritis can restrict external rotation too.
Frozen shoulder is often described as freezing, frozen and thawing phases, but real patients do not always move through neatly defined stages. Treatment is guided more by pain irritability, passive-motion loss and functional limitation than by the calendar alone.
Examination
What We Examine
- How symptoms started, and how pain and stiffness have changed
- Active and passive range of motion in every direction, especially external rotation
- Pain irritability, including night pain and pain at rest
- Rotator cuff strength and pain with resisted testing
- Shoulder blade movement and surrounding soft tissue
- A neck and neurologic screen when symptoms suggest it
- Diabetes, thyroid disease and other relevant history
- Previous imaging, injections and therapy, and how you responded
Differential diagnosis
Not Every Stiff Shoulder Is Frozen Shoulder
- Adhesive capsulitis Restricted active and passive motion, with external rotation often especially limited.
- Rotator cuff tendinopathy or tear Lifting can be painful or weak while passive motion is often better preserved. The two can coexist. See rotator cuff and shoulder pain.
- Calcific tendinopathy Can restrict abduction while external rotation is generally preserved.
- Glenohumeral osteoarthritis Can also restrict passive motion, and an X-ray helps when arthritis is suspected.
- Neck-related or neurologic pain Arm pain with numbness, tingling or weakness may come from the cervical spine.
- Postoperative or post-injury stiffness Follows a different course and is managed accordingly.
More detail is in frozen shoulder vs. rotator cuff pain.
Treatment selection
How Treatment Is Selected
Mobility and exercise are foundational. Mobility work is an important part of frozen-shoulder care, but the intensity should match the irritability of the shoulder. Aggressive end-range stretching can be poorly tolerated during a highly painful stage, while progressive mobilization becomes more appropriate as pain settles and stiffness dominates.
Radial shockwave has direct randomized adhesive-capsulitis evidence, used alongside rehabilitation.
Focused shockwave may be selected for a localized deeper target, but current evidence does not establish it as universally superior.
Manual and joint-mobility techniques may support motion and surrounding tissue function where tolerated. Joint mobilization may improve pain and motion, although the certainty of current evidence is low. These techniques should not be described as mechanically removing capsular fibrosis.
EMTT is a nonmechanical modality Novo may consider as an adjunct in selected shoulder presentations. Direct clinical evidence specifically for adhesive capsulitis is currently limited, so it should not be presented as a primary evidence-based frozen-shoulder treatment.
Medical options include corticosteroid injection and hydrodilatation. Corticosteroid injection can provide faster short-term pain relief, particularly during an early pain-dominant phase. That advantage does not necessarily persist long term. In randomized frozen-shoulder trials, early differences following steroid injection narrowed over time, with treatment groups reaching similar outcomes by 12 months. A local steroid injection also produces systemic glucocorticoid exposure, which matters particularly in patients with diabetes and with repeated exposure. More detail is in the frozen shoulder evidence review. Orthopedic evaluation is appropriate when the shoulder does not progress as expected.
You do not need to choose a treatment before the visit. The examination determines whether the shoulder is truly frozen and which next step fits. All four Novo tools are compared on the services page.
Imaging & referral
Does Frozen Shoulder Need an MRI?
Usually not to establish an uncomplicated clinical diagnosis. Imaging can help exclude arthritis, evaluate the rotator cuff or calcific tendinopathy, and assess an atypical presentation or a shoulder that does not fit the examination. MRI can show findings such as coracohumeral ligament and capsular thickening, but it is not mandatory in every case.
When Shoulder Stiffness Needs Another Evaluation
See a physician promptly after major trauma or a fall, if a fracture or dislocation is suspected, with sudden marked weakness after an injury, progressive neurologic weakness, fever or feeling systemically unwell, or severe unexplained pain. Night pain on its own is common in frozen shoulder and is not by itself a red flag.
Evidence
What Research Says
- Real fibrotic pathology: capsule biopsies show fibroblasts, new collagen deposition and fibrotic signaling, and surgical studies describe coracohumeral ligament and rotator interval contracture (Rodeo, 1997; Ozaki, 1989).
- A clinical diagnosis: no single bedside test is universally validated, so diagnosis rests on the history and the pattern of passive motion loss, especially external rotation.
- Shockwave added to therapy: in a 2025 randomized sham-controlled trial of 30 people, adding radial ESWT to the same evidence-based physical therapy program improved pain by an additional 3.33 points and disability by 24.7 DASH points at 12 weeks (Sharahili, 2025).
- Pooled evidence: a 20-study meta-analysis found better short-term pain, function and external rotation with adjunctive ESWT, although the range-of-motion and longer-term analyses were highly heterogeneous (Zhang, 2022).
- Steroid injection works faster, not necessarily longer: steroid injection and capsular distension improved pain and function compared with placebo in a 92-trial network meta-analysis, but in a 93-patient placebo-controlled trial all groups had improved to a similar degree by 12 months (Zhang, 2021; Carette, 2003).
Read the full shockwave evidence review → · Frozen shoulder vs. rotator cuff pain →
Sources: Rodeo et al., J Orthop Res 1997 · Ozaki et al., J Bone Joint Surg Am 1989 · Sharahili & Alzahrani, Saudi Med J 2025 · Zhang et al., Orthop J Sports Med 2022 · Zhang et al., Am J Sports Med 2021 · Carette et al., Arthritis Rheum 2003