Valerie in Purple Shirt has knee pain in both knees, she is taking NSAIDs, she is heading for knee replacement, she says her pain at that moment is 6 out of 10, she cannot bend her knees, after ozone injections, at first she says her pain went down to 5, then a few minutes later, she says it is down to 4, and a few minutes later, she says it is down to zero, she has 100% pain relief, she is able to avoid knee replacement surgery