AC joint disruption - when trauma leads to varying degrees of displacement of the distal clavicle from the local ligaments and muscles.
Osteoarthritis (OA) and/or osteolysis of the AC joint.
above is quoted...
OA and distal clavicular osteolysis
Diffuse lateral shoulder pain and/or localised AC joint pain.
May be simply an ache in the deltoid area.
Often worse at night.
Local tenderness with exacerbation on passive and active shoulder movements.
Cross-adduction (ie reach over front of opposite shoulder) often worsens pain, and further passive cross-adduction by the examiner may aggravate this.[6]
Ja. That.
Also:
There may be marked tenderness of the AC joint and a
visible/palpable 'step' if there is clavicular separation. This is best viewed with the arm adducted across the body.
I think that's the badger. Feckit.