Minimally invasive bone sparing acetabular reamer

An orthopedic bone cutter, comprising:

• a) a cutting shell having a base and a shell sidewall with curvature that comprises at least a portion of a hemisphere, the cutting shell, extending from said base defining a lower perimeter to an intermediate edge defining an intermediate perimeter located on an imaginary intermediate plane that is spaced from and positioned between an imaginary apex and the lower edge, wherein the lower perimeter of the lower edge is greater than the intermediate perimeter of the intermediate edge, the cutting shell being rotatable about a rotational axis;
• b) a flange having an annular flange sidewall that defines a flange opening that extends from a flange distal end at the intermediate edge to a flange proximal end extending towards the shell lower edge;
• c) a plurality of outwardly extending and spaced apart cutting shell teeth;
• d) an insert having an insert proximal end that extends to an insert distal end, wherein the insert comprises an annular insert sidewall wall that meets an insert end wall at the insert distal end, the insert positioned within the flange opening along the rotational axis, wherein the insert distal end faces the imaginary apex;
• e) a plurality of outwardly extending and spaced apart insert cutting teeth;
• and
• f) wherein the insert is capable of rotational and axial movement about the rotational axis.