I could feel a little twinge in the femur when biking early on, but it soon went away as it healed. Or were you referring to how the seat feels on your
rear. I finally had to break down and get a pair of padded cycling shorts. My rear would be more sore than my legs sometimes. But you get used to it. And you know you are getting a good workout so that helps. Did your doc say 4 months also? Sometimes I wondered about mine. He acted like he did not want me to do any exercising while I was injured. He even told me I needed to realize I was not a professional athlete? And that got me a little fired up. But I live in a small town with only 2 orthopedics and they are both in the same office. What can you do sometimes ?
Also when I was looking for advice from the blog, Scott Browning helped me out. He had a similar injury in the past. He also had lots of knowledge on what to ask my doctor and other things. You may want to go to his blog and ask for any suggestions.
http://sirenesque.fastrunningblog.com