It's important to know why you had a splenectomy and get clearance from your primary care physician prior to undergoing elective cosmetic surgery. As long as your in good health, it is acceptable to undergo a rhinoplasty procedure. Rhinoplasty is a very difficult endeavor, so choose your surgeon very wisely based on extensive experience with the procedure
You can still have a rhinoplasty after having your spleen removed. The reason why your spleen was removed could be more important in determining if you are able to undergo an elective surgery. There is an increased pre-disposition to an infection after a splenectomy, so it is important your rhinoplasty surgeon is aware of this and you are on the appropriate antibiotic therapy after surgery. Wish you the best!