at 80 90 degrees it is practical to have the potential to make the vectors vary every 10 degree increment or even less if desired the implantation of the mvcs can be by the transosseous approach or any other practical method fig1 a shows a mvcs with rod shaped components viewed implanted in the tibia viewed from above 1801 1802 and 1803 from an anterior approach fig1 b shows a mvcs with rod shaped components implanted in the tibia viewed from above 1804 1805 1806 and 1807 implanted from a medial approach fig1 shows rod shaped mvcs from a medial view similar to 1804 1805 1806 and 1807 in the tibia represented by 1910 1909 1908 and 1907 implanted from a medial approach fig1 also shows corresponding mvcs 1902 1903 1904 and 1905 implanted in the femur from a medial approach the mvcs in the femur and the tibia interact to produce the desired vectors and moments fig2 shows a modular mvcs embodiment implanted from a anterior approach 2002 2003 and 2004 are implanted in the femur from an anterior approach 2008 2007 and 2006 are implanted in the tibia from an anterior approach fig2 shows modular mvcs 2101 2102 2103 and 2104 implanted from an anterior approach this embodiment shows mvcs on both sides of the joint and correspondingly on opposed sides of a chosen mechanical axis any practical placement method can be used the mvcs can be modular so the cortical.