The "little blue fracture book" will only help if you're doing trauma or on call. There's more to ortho than trauma. If you're doing a rotation on general ortho, joints, sports, hand, peds, spine, tumor, foot/ankle (you know, nontraumatic orthopaedics), it won't get you far.
Try Orthopaedic Surgery The Essentials by Mark Baratz...it's a big book (can't carry it around) but covers everything well, not just trauma.