I've seen quite a few of your posts here on orthogate and the best advice I can give you if you want to match is to chill out. The large majority of your posts, this one being a prime example, focus on the most trivial details that really don't matter much, if at all. Your energy would be best spent at just learning anatomy, working hard, staying late, being enthusiastic, and just acting like a normal person who is easy to get along with.
Why get a book to tell you how to write a personal statement then worry whether or not to include their potential career goals 40 years from now? Write something that actually is important to you and not something scripted from a how-to book.
For those of you wondering what to write about for a good PS, the best advice I can give is to write a story about yourself and why ortho would be a good fit for you. We dont want to read solely about your competetive grades, board scores, etc. like a modified CV, and we also dont want some random story that has no relationship to orthopedics. Tell us who you are in a way that captivates our attention and why you are interested and why you will be successful in this field. Remember, we will be flipping through hundreds of these, so you want to make yours memorable. Finally, have everyone you know proof read it for you and make corrections/suggestions...family, friends, classmates, mentors, anyone. The more people the better.
Oh, and one thing that has come up in years past is length - I would recommend 1 page, no longer.