What happens in our body when we perceive nerve pain? David Butler explains physiology mechanism of pain.

Peripheral nerve: anatomy and physiology concepts explained beautifully  by David Butler.

97 patients suffering of chronic rotator cuff related shoulder pain were part of this research. Patients were analysing by ultrasound and measured their acromiohumeral space. It turns out that there is no relationship between the two.
​https://www.ncbi.nlm.nih.gov/pubmed/28315580

The National Institute for Health and Care Excellence published an updated guideline for low back pain and sciatica where manual therapy is recommended together with exercise.
​Read more at:​https://www.nice.org.uk/guidance/NG59/chapter/Recommendations#non-invasive-treatments-for-low-back-pain-and-sciatica

Knee cap pain is the most common type of knee pain.
Where is the pain?
Pain is localised in the anterior aspect of the knee, around the knee cap.
Who is affected by knee cap pain?
Male and female of different age and ability.
When the pain occurs?
Walking, running, up and down stairs, squatting.

Many more information to help you manage your knee pain can be found at:
http://semrc.blogs.latrobe.edu.au/5-things-to-help-knee-cap-pain/?platform=hootsuite