a cylindrical form having a first housing segment annular sidewall 52 that extends distally along longitudinal axis a a from a first housing segment base 54 in a preferred embodiment the sidewall 52 has an exterior sidewall surface 56 that extends to an interior sidewall surface 58 a sidewall thickness 60 resides therebetween the annular sidewall 52 of the first housing segment 28 defines a cavity 62 which is intended to be positioned over the femur end as shown in fig7 and 8a the sidewall thickness 60 extends about perpendicular to longitudinal axis a a the interior sidewall surface 58 of the first housing segment 28 defines an inner diameter 64 in a preferred embodiment the inner diameter 64 ranges from about 1 cm to about 15 cm since the inner diameter 64 defines the spacing and arrangement of the first cutting blades 46 which provide the cylindrical shape to the femur 10 the inner diameter 64 of the first housing segment 28 should be dimensioned accordingly as illustrated in fig5 a 7 a 7 b 8 and 8 a an opening 66 extends lengthwise along longitudinal axis a a through a thickness 68 of the base 54 of the first housing segment 28 the opening 66 preferably provides a space for at least a portion of the second blade holder 30 to extend therethrough in addition the opening 66 provides a space.