Kessel and Watson studied 97 patients with painful arc syndrome of the shoulder. They used local anaesthetic and radio-opaque contrast to localise the cuff lesion and correlate it with natural history. The goal was a clinical classification that predicts prognosis and guides whether a patient needs injection or surgery.
Localise the painful arc and you can predict who needs surgery before you inject. A 60 to 120 degree arc points to the subacromial region. Pain climbing to 180 degrees points to the A-C joint. That distinction sits at the root of how we still think about impingement.
Superior (supraspinatus) lesions with A-C degeneration are the ones that fail conservative care. The authors tie this poor prognosis to the relatively avascular supraspinatus trapped beneath the coraco-acromial arch, with periarticular swelling from A-C arthritis narrowing the space further. That vascular argument is worth carrying into any discussion of cuff healing.
When you do operate on the superior type, address the whole complex, not a single lesion. Partial operations failed in this series.
Weight this as a framework rather than proof: it is a small uncontrolled case series with subjective lesion localisation. Its lasting value is the mental model: match lesion site to prognosis, treat the whole complex, and do not blame incidental calcification for the pain.
Kessel and Watson studied 97 patients with painful arc syndrome of the shoulder. They used local anaesthetic and radio-opaque contrast to localise the cuff lesion and correlate it with natural history. The goal was a clinical classification that predicts prognosis and guides whether a patient needs injection or surgery.
Localise the painful arc and you can predict who needs surgery before you inject. A 60 to 120 degree arc points to the subacromial region. Pain climbing to 180 degrees points to the A-C joint. That distinction sits at the root of how we still think about impingement.
Superior (supraspinatus) lesions with A-C degeneration are the ones that fail conservative care. The authors tie this poor prognosis to the relatively avascular supraspinatus trapped beneath the coraco-acromial arch, with periarticular swelling from A-C arthritis narrowing the space further. That vascular argument is worth carrying into any discussion of cuff healing.
When you do operate on the superior type, address the whole complex, not a single lesion. Partial operations failed in this series.
Weight this as a framework rather than proof: it is a small uncontrolled case series with subjective lesion localisation. Its lasting value is the mental model: match lesion site to prognosis, treat the whole complex, and do not blame incidental calcification for the pain.