RESULTS	Mean VAS scores ( 1 = asymptomatic , 10 = severe symptoms ) decreased for pain ( group 1 : 5.6 to 3.1 ; group 2 : 4.1 to 0.9 ) , stiffness ( group 1 : 5.1 to 2.9 ; group 2 : 5.0 to 0.8 ) , and function ( group 1 : 5.8 to 3.5 ; group 2 : 4.7 to 0.8 ) from baseline to week 28 ( P < .0001 ) , favoring PRP ( P < .05 for stiffness , P < .01 for function , P > .05 for pain ) .\