hi,
1st: its always important to keep as much ROM as possible. exercises for the abductors are important for later gate phase etc. make sure that hip ext. is free because often the hip flexors shorten after sugery. pat. would compensate later with LS. for hip ext.
2: uncemented protheses are often used in younger pat. because the bone will remodel around the protheses and it will be more stabil and last longer. but mostly the pat. are not allowed to fully weight bear for a while until the protheses attached to the bone. cemented protheses are used in elderly pat. because you can realy early mobilize the pat. thats important for ventilation of the lungs and the whole CV system.
3. which protheses depends on the age of your pat. young= uncemented old= cemented
good luck cheers