Hypothesis 1		TRAUMA

	Trauma is a possible cause for the hind leg lameness for a variety of 
reasons.  
First, there was the obvious injury of falling of the bed one year earlier.  
Trauma to the 
stifle would weaken the lateral support leading to luxation.

 This injury could result in nerve damage.  This would explain the pain involved 
in lifting 
the tail.  Nerve damage would result in muscle atrophy which would lead to 
scarring.  
Therefore, the patella would be constricted.  This would lead to medial 
luxation.

  Also, an injury in the stifle joint could predispose Titan to dejenerative 
joint disease 
which would have the possiblity of showing up months later. 

 Also, Titan could have had a bone injury, which healed incorrectly leading to 
reoccurring problems.  

Titan also could have injured ligaments that would lead to joint instability 
causing the 
medial joint capsule to become thickened. ( medial butressing causing cranial 
drawer sign 
to be negative.) 

 Another possiblity would be a partial tear in one of the ligaments which could 
result in 
the intermittent lameness.