Hypothesis 3: Extensor Tendon Abnormality

Upon orthopedic examination, a metacarpal valgus deformity of the left front limb was 
noted.  It was hypothesized that injury to this limb occurred during the birthing process 
by forced extraction, resulting in a fracture of the distal metacarpus, possible 
metacarpophalangeal joint damage, and possible epithelial injury from the chains.  
Secondary to improper bandaging of the limb, an anaerobic bacterial infection ensued 
(explaining the draining tracts), vascular supply to the limb was compromised, and 
abnormal compressive forces were placed on the distal metacarpal physis, likely causing 
the valgus deformity.
	In addition to these abnormalities, it was noted on physical exam that there were 
tight bands of tissue on the dorsum of the distal limb.  This most likely correlates with 
abnormal extensor tendons, or extensor tendon damage.  The resulting clinical signs 
could be due to iatrogenic damage to the flexor tendons during the birthing process.  
Tearing or rupture of the flexor tendons would cause contracture of the extensor tendon, 
also limiting the range of motion of the MC phalangial joint.  Fibrosis and scarring of the 
extensor tendons themselves due to iatrogenic damaged could cause contracture, as well 
as incorrect placement of the bandage/cast. (Hyperextension of the MC phalangial joint at 
time of bandage placement could results in healing of the joint in this position.)