I could n't imagine what his life was like , living with discomfort in his knee joints since he was 17 .
I knew a baseball catcher who had blown out his knees in high school and always had bum knees afterwards .
I could n't imagine what baseball catcher 's life was like , living with discomfort in his knee joints since he was 17 .
I knew a baseball catcher who had blown out his knees in high school and always had bum knees afterwards .