Why Is Frozen Shoulder So Difficult to Diagnose in the Early Stage?

by Son PMR(Physical medicine & Rehabilitation ) & Chiropractic Clinic in Seoul

Frozen shoulder, medically known as adhesive capsulitis, is a condition that causes stiffness, pain, and reduced range of motion in the shoulder joint. It is particularly common in people in their 40s to 60s. However, early diagnosis is often difficult due to several clinical factors, which are supported by medical literature and real-world experience.

1. Nonspecific and Gradual Onset of Symptoms

Frozen shoulder typically begins without any specific trauma or injury. In the early phase, patients usually experience vague shoulder discomfort or mild pain, which can be mistaken for common muscle strain or overuse. The gradual nature of symptom development makes it easy to overlook or misattribute the cause.

Zuckerman JD, Rokito A. J Shoulder Elbow Surg. 2011: "Frozen shoulder: a consensus definition."

2. Stage-Specific Presentation

Frozen shoulder progresses through three classic stages:

  • Freezing (Painful) Stage: Pain is the main symptom; range of motion is still relatively preserved.

  • Frozen Stage: Stiffness becomes more prominent, and shoulder movement is significantly restricted.

  • Thawing Stage: Gradual improvement in movement and reduction in pain.

In the early “freezing stage,” joint mobility may appear nearly normal, which makes it difficult to distinguish from other shoulder problems such as myofascial pain or rotator cuff inflammation.

3. Lack of Distinct Imaging Findings

Imaging studies such as X-rays, ultrasound, or even MRI may not show clear abnormalities in the early stage of frozen shoulder. Since the key changes involve inflammation and fibrosis of the joint capsule, which are subtle and not always visible on scans, imaging is often inconclusive.

Mengiardi B, Pfirrmann CW et al. Radiology. 2004: "Frozen shoulder: MR arthrographic findings."

4. Similar Presentation to Other Shoulder Conditions

Frozen shoulder shares symptoms with several other common shoulder conditions, including:

  • Rotator cuff tendinopathy or tears

  • Subacromial impingement

  • Calcific tendinitis

These conditions also cause pain and limited movement, which makes differential diagnosis challenging without thorough physical examination and medical history.

Conclusion

Early-stage frozen shoulder is often underdiagnosed or misdiagnosed due to its subtle symptoms, lack of clear imaging findings, and similarity to other shoulder disorders. A detailed clinical examination by an experienced practitioner is essential. If you are over 40 and experiencing persistent shoulder pain without trauma, early consultation may prevent progression and aid recovery.

👍Consultation and Appointment Information

Son PMR & Chiropractic Clinic( 2nd floor, 229-1 Gucheonmyun-Ro, Gangdongu, Seoul, South Korea) 

by  Dr Son MD & DC 
Contact: 02-482-8875 in Seoul( +82-2-482-8875)

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