I only recommend this book if you are an absolute beginner to yoga and aren't looking for a lot of a lot of detailed information on various types of knee injuries. Although I got a couple of helpful tidbits from this book, it wasn't particularly useful for me as an intermediate yoga student. I'd been practicing yoga for about a year, when I dislocated my knee doing cow face pose. Since I'd dislocated my knee several times as a teenager, I wanted to avoid another injury. I was hoping for tips on how to safely ease into lotus, but the author doesn't even mention lotus pose. I was also hoping for definitive answers on which poses to avoid (I still don't know whether I can safely do reclining hero pose). Some instruction on bracing or taping techniques would have been helpful, but there is nothing like that in this book. Overall, the info isn't very specific and the poses offered may be too easy for some people.