I'm sure that row 49 does recline, so I wouldn't worry about it

Rows 38 B&C on EK106 and 24J&H on EK404 are not bulkhead seats, at least that's what it says on Emirates.com. You can check/change your seating on their website at this link :
https://fly.emirates.com/MYB/MMBLogin.aspx
However, this function has been on/off for the past days so be patient. You can also see which seats are exit/bulkheads, etc here too:
http://www.emirates.com/english/flyi...ce_finder.aspx

What you can do is try to request for the exit row seats when you check-in at the airport. It would help if you had somekind of medical certificate to say you've injured your knee and need more space for your legs to stretch.