Saturday the weather was really nice and I had this great route planned. Started out from Brush Canyon came in through lower Aliso. The park was really quiet. Met a friend who came down from Faultline. She told me the Carbon Canyon side was busy but she also said the east side was quiet. Told her my planned route and then proceeded to climb from the bottom of Faultline up Upper Aliso over to Sidewinder. The trail was less overgrown then before so I was encouraged the singeltrack would be better. Well, long story short... the singletrack is very overgrown, at the first "whoopdedoo" just up at the top, mustard grabbed my wheel and my bike started to go over.... instead of just going with the fall, I got my leg down... in "slow-mo" I could see my leg and foot falling away from me (since I was on a hill and falling into the ravine) and I saw my foot twisted back before BAM I landed on it. I heard the crack and knew immediately something was wrong. Laid there awhile pondering what to do, hoping someone would ride by... time passes...no one and I made an attempt to walk/ride out. Since most of the trail is downhill, I had hoped riding would work but when I had to stop; the pain was so severe I would almost pass out. I couldn't risk that so started walking; using my bike as a crutch/support. I could take a step or two and would have to stop because of the pain. I knew my ankle was badly swollen and sprained but also knew something else was wrong; mostly likely my leg was broken. Time passed, an hour, almost two... I had to move so slowly. Finally just before Sidewinder meets Lower Aliso, another rider was climbing up the trail. I shout "SO GLAD TO SEE YOU. I BROKE MY LEG AND NEED HELP!!!" The rider stopped looked disgusted (OK so here is this old, fat lady blocking the trail) and then replied "What can I do?" and continued to ride passed me. That shocked me more than the break. So I continued inching out to the main trail. Time elapsed about 2 hours 15 minutes (I think Sidewinder is only a mile or so). I took a chance and rode down the main trail to the Ranger Station; painful but had no choice. I could not get cell service (didn't think to text - stupid on my part). No one at the ranger station and no riders around - sucks! Also no cell coverage. So I knew I had to ride up the hill to the overlook and then try and call. That was painful but I got up there, got cell coverage and called my friend who I knew would make all the rights calls for me. I sat and waited for the CHSP ranger (Carmine - a real sweetie) to show up as well as the Chino fire department. EMTs splinter the leg and Carmine drove me back to the Discovery Center (I got to see the new Bane Canyon rd which opens in June) where my friend picked my up and drove me to St. Jude, at the exact same time Fullerton Loop was on fire - what chaos!!!! Fire trucks everywhere! Anyway diagnosis - severely sprained ankle and broken tibia (the non-weight bearing bone I forget which one), broken due to the twisting of my ankle. No riding 6 - 8 weeks. Lessons learned: 1) Always carry a charged up cell phone! Always! 2) Make sure someone knows where you are riding. 3) Don't be afraid to ask for help even if some jerkoff will refuse 4) Don't expect anyone to help so be aware when riding alone in isolated areas. Won't do that again.... if its a trail people usually don't use, always have a buddy.