PM&R · 2013 · 37 citations · 49 references
The surface goniometry protocol described herein appeared to be reliable for relatively lean young men and women. Although measures were precise to 1.0°, it appears a difference of 3° may be needed to detect a real difference in Q-angles when measured in this fashion.
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Measures of Reliability in Sports Medicine and Science
Will G. Hopkins · Sports Medicine · 2000 · 4.4K citations