Frozen Shoulder, Rotator Cuff, Impingement. How I Actually Tell Them Apart

A patient came to me unable to lift his arm. He had been told it was frozen shoulder. His previous physiotherapist had been treating it as frozen shoulder for weeks.

It was not frozen shoulder.

When I assessed him properly, I found a supraspinatus tendinitis with a rotator cuff tear. Because he had been guarding the shoulder in a protective position for so long, the movement restriction looked exactly like frozen shoulder from the outside. Same limited range. Same pain pattern on lifting. Different problem entirely. Different treatment needed.

This is why I always do my own assessment, regardless of what diagnosis a patient arrives with.

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Why I assess every shoulder patient from scratch

Orthopaedic doctors work in short appointments. They cannot do what a physiotherapist does in a full session. A detailed physiotherapy assessment covers every range of movement, strength testing in each direction, sensation, functional activities, and specific clinical tests that point toward the actual diagnosis.

I am not second-guessing the doctor. I am doing a different kind of assessment that takes more time and looks at different things. And in my experience, that assessment regularly reveals something that changes the treatment plan entirely.

The three shoulder conditions I see most often are frozen shoulder, rotator cuff injury, and impingement. They can all present with shoulder pain and restricted movement. But they are three completely different problems and they need three completely different rehabilitation approaches.

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How I tell them apart

The pattern of movement restriction is the most important diagnostic signal.

In frozen shoulder, external rotation is severely limited first. This is followed by restriction in abduction and then forward flexion. If a patient comes to me and I check their range and external rotation is the most restricted movement by a significant margin, frozen shoulder becomes the primary working diagnosis. I also look for risk factors: diabetes, being male, age between forty and sixty. These are associated with frozen shoulder and help confirm the picture.

In rotator cuff injury, the picture depends on which muscles are affected and the extent of the damage. I use specific clinical tests to identify which rotator cuff muscles are involved. The apprehension test, the Neer impingement test, specific strength testing in different positions. The pattern of weakness and pain tells me which structure is compromised.

In impingement, there is typically a painful arc. A range of movement, often between 100 and 120 degrees or 120 to 140 degrees of shoulder elevation, where pain spikes and then reduces again above and below that range. This painful arc, combined with the Neer impingement test, points toward impingement rather than a full rotator cuff tear or frozen shoulder.

All three require physical assessment. No scan alone tells the full story. What the shoulder does under movement, under load, and under specific clinical tests is what gives me the diagnosis I can treat.

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Why treating all three the same way produces no result

This is the most common reason shoulder rehabilitation fails. The diagnosis is either wrong or the treatment is generic regardless of the specific diagnosis.

Frozen shoulder has three phases: freezing, frozen, and thawing. Each phase needs a different approach. In the frozen phase, aggressive mobilisation makes things worse. The treatment has to respect where the patient is in the condition. Because external rotation is the most restricted and most painful movement, it is the last range we work on. We start with flexion and abduction, build range gradually, and open external rotation once the other ranges have improved. Forcing it creates more pain and more guarding, which slows recovery.

Rotator cuff rehabilitation is about identifying which muscles are weak and strengthening them specifically. The programme is built around the specific tear or injury pattern. You cannot write a generic rotator cuff programme because a supraspinatus tear needs different loading than an infraspinatus injury. The assessment identifies the weak link and the rehabilitation targets it directly.

For impingement, the goal is to create more space in the shoulder joint by strengthening the muscles that control the position of the humeral head and the scapula. We start strengthening in the pain-free range, typically from zero to ninety degrees, and gradually increase the load and range as the muscle gets stronger and the impingement reduces. Pushing through the painful arc too early inflames the tissue and sets the rehabilitation back.

The one thing common to all three is this: we always strengthen the muscles around the shoulder and scapular joint. Shoulder stability comes from the rotator cuff and the muscles that control the scapula working together. Every shoulder rehabilitation programme I run, regardless of the specific diagnosis, addresses this. But how we load those muscles, in what range, at what intensity, and in what sequence depends entirely on what the assessment found.

If your shoulder treatment has not worked before: Why Physiotherapy Stopped Working for You and What I Look for Instead

For a real bilateral shoulder surgery case: He Needed Surgery on Both Shoulders. He Was a Competitive Wrestler. He Came Back.

For cricket players dealing with shoulder injuries from bowling: Why Cricket Injuries Keep Coming Back and What the Bowling Action Actually Does to the Body

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What this means for your shoulder pain

If you have had shoulder pain diagnosed and treated without lasting improvement, ask one question: was the treatment specific to my diagnosis, or was it a generic shoulder programme?

Generic shoulder exercises produce generic results. A programme built around your specific diagnosis, your specific range restriction, your specific weak muscles, and your specific stage of the condition produces results that last.

I see shoulder patients in Saket, South Delhi including athletes with sport-related shoulder injuries and general patients with frozen shoulder, rotator cuff damage, and impingement. WhatsApp me at +91 92893 03555. The first session is an assessment, not a treatment.

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Dr. Manvi Dhyani, PT holds an MPT in Sports Physiotherapy from Jamia Millia Islamia and is a registered physiotherapist with the Delhi Council for Physiotherapy and Occupational Therapy (Reg. TPR-2666). She has worked as a team physiotherapist with the Central Reserve Police Force, completed international field postings with ProHealth Asia across four countries, and served as physiotherapist for India’s national archery team at the 2021 World Archery Youth Championships in Wroclaw, Poland. She practices in Saket, New Delhi.

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Dr. Manvi Dhyani is a qualified physiotherapist (MPT Sports Physiotherapy, Jamia Millia Islamia; Registered Physiotherapist, Delhi Council for Physiotherapy and Occupational Therapy, Reg. TPR-2666). The title Dr. is used in accordance with her doctoral-level physiotherapy qualification and does not denote a registered medical practitioner under the NMC Act, 2020.