Knee chamfer block guide with 3D printed undercut saw slot

A bone saw cutting guide block, comprising:

• (a) a body, wherein the body comprises:
• (i) a proximal surface,
• (ii) a distal surface,
• (iii) a first lateral surface, and
• (iv) a second lateral surface;
• and
• (b) a bone saw guide assembly, wherein the bone saw guide assembly comprises a first guide slot defined by the body, wherein the first guide slot extends though the proximal surface and the distal surface along an insertion and retraction path, wherein the first guide slot is configured to accommodate lateral movement of a bone saw while guiding the bone saw along the insertion and retraction path, wherein the first guide slot comprises:
• (i) a first contact surface,
• (ii) a second opposing contact surface defining a first gap with the first contact surface,
• (iii) a first offset surface adjacent to the first contact surface,
• (iv) a second offset surface adjacent to the second opposing contact surface and defining a second gap with the first offset surface, wherein the second gap is larger than the first gap, wherein the first offset surface and the second offset surface are configured to not contact the bone saw while the first interior surface and the second opposing interior surface guide the bone saw along the insertion and retraction path,
• (v) a first rib extending from the first offset surface, and
• (vi) a second rib extending from the second offset surface, wherein the first rib, the second rib, the first interior surface, and the second opposing interior surface are configured to contact the bone saw while accommodating lateral movement of the bone saw and guiding the bone saw along the insertion and retraction path.

A bone saw cutting guide block, comprising:

• (a) a body, wherein the body comprises:
• (i) a proximal surface,
• (ii) a distal surface, and
• (iii) a chamfered corner, wherein the chamfered corner is located between the proximal surface and the distal surface, wherein the chamfered corner and the proximal surface define a laterally extending entry slot;
• and
• (b) a bone saw guide assembly, wherein the bone saw guide assembly comprises a first guide slot and a second guide slot, wherein the first guide slot extends from the laterally extending entry slot through the distal surface, and wherein the second guide slot extends from the laterally extending entry slot through the distal surface, wherein the first guide slot comprises a narrow entry portion defining a first gap and a widened central portion defining a second gap that is larger than the first gap, wherein the narrow entry portion is defined by a first contact surface and a second contact surface facing each other, wherein the widened central portion is defined by a first offset surface and a second offset surface, wherein the first offset surface and the second offset surface face each other, wherein the bone saw guide assembly further comprises a first rib extending from the first offset surface and a second rib extending from the second offset surface, wherein the first contact surface, the second contact surface, the first rib, and the second rib are configured to contact a bone saw while accommodating lateral movement of the bone saw and guiding the bone saw along an insertion and retraction path defined by the first guide slot, wherein the insertion and retraction path, the first gap, and the second gap are centrally aligned.