Back studies:
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Systematic Literature Review of Imaging Features of Spinal Degeneration in Asymptomatic Populations
https://pubmed.ncbi.nlm.nih.gov/25430861/
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Incidental Findings on Magnetic Resonance Imaging of the Spine in the Asymptomatic Pediatric Population: A Systematic Review
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4174226/
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The Value of Magnetic Resonance Imaging of the Lumbar Spine to Predict Low-Back Pain in Asymptomatic Subjects
https://journals.lww.com/jbjsjournal/Abstract/2001/09000/The_Value_of_Magnetic_Resonance_Imaging_of_the.2.aspx
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Magnetic Resonance Imaging of the Lumbar Spine in People without Back Pain
https://www.nejm.org/doi/full/10.1056/nejm199407143310201
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New In Vivo Measurements of Pressures in the Intervertebral Disc in Daily Life
http://www.fonar.com/pdf/spine_vol_24.No.8.pdf

Knee/hip studies:
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Strengthening Your Hip Muscles. Some Exercises May Be Better Than Others
https://www.jospt.org/doi/pdf/10.2519/jospt.2013.0501
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ELECTROMYOGRAPHIC ANALYSIS OF GLUTEUSMEDIUS AND GLUTEUS MAXIMUS DURING REHABILITATION EXERCISES
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3201064/
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The influence of varying hip angle and pelvis position on muscle recruitment patterns of the hip abductor muscles during the clam exercise
https://www.jospt.org/doi/10.2519/jospt.2013.4004
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Anterior Cruciate Ligament Surgery Optimize Return to Activity and Minimize Risk of a Second https://www.jospt.org/doi/pdf/10.2519/jospt.2013.0506 See the complete study and exercise progression at the appendix of https://www.jospt.org/doi/10.2519/jospt.2013.4693
Pain research:
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Lorimer Moseley - Why Things Hurt https://www.youtube.com/watch?v=gwd-wLdIHjs&t=11s.
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A tale of 2 nails https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2908292/
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Resources from Dr. Rachel Zoffness https://www.zoffness.com/resources/
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Recommended book for pain management https://www.amazon.com/gp/product/1684036445/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1
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Bio-feedback https://bio-medical.com/stress-thermometer-sc911.html
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Relationship between immune cells and pain: Interactions between the immune and nervous systems in pain