I took a fall in black Ice thirty three years ago the fall damaged my left knee so much it fragmented the cartilage that my knee would slip out sideways- very, very painful. I liked physical exercise and done, the hospital would not give me a replacement knee cap unless I gave up sports. I wasn't very good at it but it kept me fit,I had lost 5st in weight and wasn't putting it back on & had I given up sports I might have regained the weight, unthinkable. I wore a rather large knee brace during sports which made it difficult to perform but I carried on in pain most times. When my son was born I developed asthma, I was using the inhaler 8 times a day, & the preventer twice at night at least!.