help with basic concept explaination please!

[duckduck]

Hey guys, I am first year physio student so please forgive my naïvety!

but just a quick question with regards physiological movements with regards to a contractile muscle lesion :

" eg. a muscle lesion in anterior fibres of deltoid will be painful on active flexion of shoulder joint and passive extension of the shoulder" - Petty.

I understand why its painful on active flexion but why passive extension?

any help is much appreciated.

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[pt.marciof]

With passive extension you would be stretching the anterior fibres of the deltoid which would lead to pain...