GOOD AFTERNOON,I'VE BEEN A COMMERCIAL TRUCK DRIVER FOR 35+YEARS.FOR THE

GOOD AFTERNOON,I'VE BEEN A COMMERCIAL TRUCK DRIVER FOR 35+YEARS.FOR THE LAST 10MONTH'S I'VE BEEN ON WORKMAN'S COMP.DUE TO A NECK INJURY.THEREFORE THE AMOUNT OF EXCERISE I'M PERMITTED TO DO IS LIMETED,SO WHEN MY PAIN HAS BECOME MANAGEABLE,I'VE STARTED A WALKING REGIMENT,APPROX.2-3 MILES A DAY,6 DAY'S A WEEK,LATELY THOUGH MY LEFT KNEE HAS BECOME EXTREMELY PAINFULL DURING MY WALK'S,CAUSING ME TO TAKE BREAK'S DURING THESE WALK'S.ALSO MY KNEE,WHEN STRETCHED,OMIT'S A LOUD,NOTICEABLE.CRACKING SOUND AND AN UNCOMFORTABLE FEELING! ANY SUGGESTION'S? THANK YOU MICHAEL K