Agree that Exposures and Netter are best for anatomy. If it's not in exposures, it's not important.
Wiesel's Essentials is excellent. So is Baratz's essentials but much longer. I read Wiesel's essentials before starting. During my rotations, I would do what the residents did -- see a case in the ER and read up on it in Rockwood and Green in the library. It was a lot of reading but at least i knew i was using the right source. They asked me more ortho than anatomy i think and on more than one occasion they put up a film in a conference and called on me to read it. I thought this was unfair and sometimes quite frustrating because i knew all the anatomy like the back of my hand but was asked to read a film...too bad, so sad. You probably won't get the ortho questions unless you're a sponge or if you've had prior experience, but do know the basics of how to read a film -- view, angulation, displacement, etc..especially for common fractures (tibial shaft!, femur, etc.)...this is covered in Wiesels. Know the carpal bones and bones of the foot and how to identify them on xray. Also learn to identify what view the film is (oblique, AP, lateral)...this is very basic but can be confusing for the foot, ankle and wrist if you don't have experience. I recommend Rockwood and Green's early chapter on nonoperative treatment (chapter 5 in new edition) -- a lot of fractures you see are treated nonoperatively and this chapter covers all of them, along with basics of casting, splinting and skeletal traction. If you're ambitious, chapters 7 and 10 are good too (external fixation and open fractures). Rockwood and Green may be intimidating to pick up but these early chapters are written in a way that a beginner can understand them and i found them very helpful. This may be the only chance for you to learn ortho before your pgy2 year so it's a good idea to approach it like that and be serious about reading up on cases you see in the ER or clinic.
Good luck.