In desperate need of help with this statically indeterminable problem

[Chelsiukas]

Homework Statement

http://img855.imageshack.us/img855/5648/fbds.png

Basically I am analysing the human leg in the given position. I need to find the force (F) which is exerted at point C, when the person is in such a position. Point B represents a "pin connection" at the ankle, body AB is the shin, BC - the thigh. All masses and distances are known.

Homework Equations

These are the main equations of static equilibrium for the two bodies.

http://img600.imageshack.us/img600/6118/equilibriums.png

Unknowns: Bx,By,N,Ax,Mb,Mc,F.

The Attempt at a Solution

That was my attempt, I am not looking for a numerical solution, just some help with how should I continue... If this truly is a statically indeterminable problem, I don't think that the method of superposition or other deviation related methods could help... Any input would be greatly appreciated. Even if it includes pointing out a stupid mistake of mine.. :D Thanks, guys!

 

[LawrenceC]

"Point B represents a "pin connection" at the ankle, body AB is the shin, BC - the thigh."

If B is the ankle and AB the shin, how can BC be the thigh?

 

[Chelsiukas]

Omg, stupid mistake, sorry. A is the pin joint.