Position Bone and Joints

[Yue]

		function this:InitJoints()
			
			self.posNeck = self.jboneNeck:GetPosition(true)
			-- >>> Not Work self.jHeadSpine2 = Joint:Hinge(self.posNeck.x, self.posNeck.y, self.posNeck.z, 1,0,0, self.modelSpine2, self.modelHead ) 
			self.jHeadSpine2   = Joint:Hinge(self.modelHead:GetPosition(false).x,self.modelHead:GetPosition(false).y,self.modelHead:GetPosition(false ).z,1,0,0, self.modelSpine2, self.modelHead )
		end

For some reason this does not work correctly, I want to move some rigid bodies and create a collision in the position of the character having as a point of union the position of the bones of the nape of the neck. But it doesn't work. 

However it does work with some element of the head collider or the toras.

Any suggestions.