Hypothesis 2:

	There may be a fracture of either the proximal ulna or humerus.  There is a history of the foal being kicked by another foal, which is consistent with this type of fracture.  Also the presentation and findings in the physical exam are consistent with this type of injury.  The lameness is described as slight weight bearing while standing but non-weight bearing, almost dragging of the limb when the foal is walking.  With an ulnar fracture the horse is able to place the hoof on the ground but is unable to fix the carpus in an extended position for weight bearing.  There is the characteristic "dropped elbow" appearance of the limb, which is caused by an ulnar fracture.  This can be due to the displaced ulna, which would give he appearance of the elbow being away from the body wall.  Also the carpus is maintained in the flexed position.  This may be due to the muscles or tendons that are attached to the proximal ulna, which are extensors, and are unable to extend the limb.  The flexion apparatus of the leg will still be in place and cause the limb to be in the flexed position.  
With a fracture of the humerus many of the same clinical signs will be seen.  The limb will be kept in an extended position because the extensor carpi radialis attaches to the distal humerus and if the humerus were fractured would not allow for the extension of the limb.  The flexion muscles that are attached to the scapula and olecranon would still allow flexion of the limb.    
	Heavy musculature of the Quarterhorse breed would mask crepitation or palpable fractures in this area.  Swelling would be seen in the area described with either of these fractures and would also help to mask the fractures below the muscles.  
	These was muscle atrophy to the muscles in this are which can be explained by the foal not using the muscles for mobilization the past couple of weeks.  
	Fractures of any types would cause inflammation and swelling which would explain the soft tissue swelling in this area.  Also there may be some underlying muscle damage either from the initial trauma or from the bones lacerating the overlying muscles.