Hypothesis 1:Femoral Fracture and Soft Tissue Damage

Diffuse soft tissue damage has caused extensive inflammation, leading to 
swelling which 
may impinge on joints and nerves, causing pain and resulting in a non-weight 
bearing 
lameness in the left hind leg.  The soft tissue damage is most likely associated 
with a 
fracture (most likely of the femur, due to the fact that its continuity was 
suspect, but since it 
could not be precisely located, it could also potentially be a fracture of the 
pelvis or damage to the hip joint) which further contributes to the non weight-
bearing status.  As stated in the physical exam, the incontinuity in the right 
tibia suggests a fracture at that location as well.

Due to the fact that this is a traumatic injury, there is also the potential for 
other complications such as pneumothorax, myocarditis, ruptured bladder/spleen, 
neurologic damage, shock, etc, which also need to be evaluated in the plan of 
action.

The other two hypotheses are possibly related to this theory in some way.