Patent ID: 8840570

Claim:
An apparatus for evaluating leg movement characteristics of a patient having a particular valgus/varus knee condition, said patient having a first leg including a first upper leg portion and a first lower leg portion, a first knee between said first upper and lower leg portions, and a first foot, said patient having a second leg including a second upper leg portion and a second lower leg portion, a second knee between said second upper and lower leg portions, and a second foot, said apparatus comprising: a frame assembly, said frame assembly comprising: 1) a first lower leg supporting portion comprising a first primary rail, said first lower leg supporting portion being configured for attachment to said first lower leg portion, said first lower leg supporting portion including a foot rotation assembly comprising a foot support member configured to support said first foot of said patient and to selectively attach relative to said first foot, said foot rotation assembly being configured to exert a force upon said foot support member to provide rotation of said first foot relative to said first primary rail and to transfer a torque to the first knee of said patient; 2) a first upper leg supporting portion comprising a first secondary rail, said first upper leg supporting portion being configured for attachment to said first upper leg portion, said first secondary rail pivotably attached relative to said first primary rail by an intermediate pivoting connection comprising at least one pivot axis configured to extend through said first knee, said first upper leg supporting portion configured to support said first upper leg separately from said first lower leg supporting portion, said intermediate pivoting connection being configured to pivot about said at least one pivot axis to accommodate a patient's particular valgus/varus knee condition; 3) a second lower leg supporting portion comprising a second primary rail; 4) a second upper leg supporting portion comprising a second secondary rail pivotably attached relative to said second primary rail to allow for variation in a particular patient's valgus/varus knee condition when said apparatus is in use by said patient; 5) a distal cross member having two opposing ends, a first of the two opposing ends being pivotably attached relative to said first primary rail, a second of the two opposing ends being pivotably attached relative to said second primary rail; and 6) a proximal cross member having two opposing ends, a first of the two opposing ends being pivotably attached relative to said first secondary rail, a second of the two opposing ends being pivotably attached relative to said second secondary rail.