I'm doing a charity walk next week and my knee has suddenly stopped working - lots of pain, sore to stand on and bend. I've had niggles in the past but this is much worse. Background is I'm in my fifties but very fit and healthy, a keen walker and had no qualms about the walk at all until the last few days - DH has suggested that I should pull out. But I think I can finish it with ibuprofen and a knee brace. AIBU? Anyone else been in this situation before? Thanks!