I agree, his legs look normal to me. What is making you think he has MBD? If he has a good strong grip I think you're OK. My first boy Pete however, never had deformed limbs or a weak grip but started grabbing his front legs with his back feet and falling in his cage. He passed about 3 weeks after his first fall. I felt horrible because I had supplemented improperly and was a contributor to his demise even though I followed the directions given by the store personnel. Luckily I found this forum and have learned a lot and have two (not so happy cause we are out of worms but they're coming soon) boys.