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The alteration of postosteotomy mechanical axis (MA) and percentage of mechanical axis (MA%) on navigation under external force. In this knee, the post-osteotomy MA and MA% were 3.5° and 62%, respectively, in the unloaded position. Those values were decreased to 1.7° and 52%, respectively, under varus force, and increased to 5.4° and 72%, respectively, under valgus force.
