You might be interested in Jeff Galloway's training method. He recommends run/walk intervals that might suit your hip condition really well. Using a program like this, even though you won't be running the whole time, you'll keep a consistent pace. Good luck to you!
http://www.jeffgalloway.com/training/half_marathon.html
2012 Results/Upcoming:
1/8: XTERRA Trail Series Boney Mountain 21K 2:07:10
2/5: XTERRA Trail Series Mission Gorge 15K 1:29:15
2/19: Rock n' Roll Pasadena Half Marathon 1:36:32
2/25: Los Alamitos Race on the Base 10K: 44:16 5K: 22:11
3/17: St. Patty's Day 5K: 20:28
3/25: XTERRA Trail Series Black Mountain 15K 1:28:25
4/7: Hollywood Half Marathon 1:38:15
4/29: XTERRA Trail Series Malibu Creek 22K 2:15:10
5/6: Verdugo Mountain Trail 10K 55:37
5/20: Pasadena Marathon 3:52:09
6/10: Holcomb Valley 15 Mile Trail Run