An implant for shoulder arthroplasty, said implant comprising: a stem having a proximal portion, a distal portion, an anterior portion, a posterior portion, a medial portion, and a lateral portion, wherein the stem has a size and shape for insertion into an intramedullary canal of a humerus bone, the humerus having a metaphysis and a diaphysis, wherein the proximal portion of the stem comprises a concave taper decreasing in size in a direction extending from the proximal portion toward the distal portion, and wherein the distal portion of the stem comprises a distal taper decreasing in size in a direction extending from the proximal portion toward the distal portion, and wherein the distal taper comprises a taper in a direction extending between the anterior portion and the posterior portion of the stem, and wherein the distal taper comprises a taper in a direction extending between the medial portion and the lateral portion of the stem, and wherein the shape of the stem is configured to load the metaphysis with a load greater than a load on the diaphysis, and wherein a lateral surface of the distal taper comprises a convex curve extending in a direction from the proximal portion toward the distal portion, and wherein a medial surface of the distal taper comprises a concave curve extending in a direction from the proximal portion toward the distal portion, and wherein the taper in the direction extending between the anterior portion and the posterior portion is symmetric about a medial plane of the implant so as to allow bilateral usage in the shoulder, and wherein the implant comprises a cylindrical extrusion disposed adjacent the proximal portion of the stem and substantially perpendicular to the proximal portion, and wherein a first point is disposed on an anterior portion of cylindrical extrusion and a second point is disposed on a posterior portion of the cylindrical extrusion, and wherein a third point is disposed distally away from the first point and the third point is disposed on an anterior portion of the distal taper, and wherein a fourth point is disposed distally away from the second point and the fourth point is disposed on a posterior portion of the distal taper, and wherein the first, second, third, and fourth points (63, 64, 66, 67) define a first total included angle of a proximal portion of the distal taper, and wherein a fifth point is disposed at a distal end of the stem and disposed on the anterior portion of the stem, and wherein a sixth point is disposed at the distal end of the stem and disposed on the posterior portion of stem, and wherein the third, fourth, fifth, and sixth points (66, 67, 69 and 70) define a second total included angle of a distal portion of the distal taper, and wherein the second total included angle is less than the first total included angle. a stem having a proximal portion, a distal portion, an anterior portion, a posterior portion, a medial portion, and a lateral portion, wherein the stem has a size and shape for insertion into an intramedullary canal of a humerus bone, the humerus having a metaphysis and a diaphysis, wherein the proximal portion of the stem comprises a concave taper decreasing in size in a direction extending from the proximal portion toward the distal portion, and wherein the distal portion of the stem comprises a distal taper decreasing in size in a direction extending from the proximal portion toward the distal portion, and wherein the distal taper comprises a taper in a direction extending between the anterior portion and the posterior portion of the stem, and wherein the distal taper comprises a taper in a direction extending between the medial portion and the lateral portion of the stem, and wherein the shape of the stem is configured to load the metaphysis with a load greater than a load on the diaphysis, and wherein a lateral surface of the distal taper comprises a convex curve extending in a direction from the proximal portion toward the distal portion, and wherein a medial surface of the distal taper comprises a concave curve extending in a direction from the proximal portion toward the distal portion, and wherein the taper in the direction extending between the anterior portion and the posterior portion is symmetric about a medial plane of the implant so as to allow bilateral usage in the shoulder, and wherein the implant comprises a cylindrical extrusion disposed adjacent the proximal portion of the stem and substantially perpendicular to the proximal portion, and wherein a first point is disposed on an anterior portion of cylindrical extrusion and a second point is disposed on a posterior portion of the cylindrical extrusion, and wherein a third point is disposed distally away from the first point and the third point is disposed on an anterior portion of the distal taper, and wherein a fourth point is disposed distally away from the second point and the fourth point is disposed on a posterior portion of the distal taper, and wherein the first, second, third, and fourth points (63, 64, 66, 67) define a first total included angle of a proximal portion of the distal taper, and wherein a fifth point is disposed at a distal end of the stem and disposed on the anterior portion of the stem, and wherein a sixth point is disposed at the distal end of the stem and disposed on the posterior portion of stem, and wherein the third, fourth, fifth, and sixth points (66, 67, 69 and 70) define a second total included angle of a distal portion of the distal taper, and wherein the second total included angle is less than the first total included angle.