A stemless humeral anchor (403; 503; 603; 703; 803; 903), comprising: - a distal portion extending proximally from a distal end of the stemless humeral anchor, the distal portion being configured to occupy a portion of a metaphysis of a humerus when implanted, - a proximal portion (407; 507; 607; 807; 907) extending distally from a proximal end (439; 539; 639; 839; 939) of the stemless humeral anchor, - a first recess extending distally from the proximal end of the stemless humeral anchor and into the proximal portion, and - an inner periphery disposed about the first recess adjacent to the proximal end of the stemless humeral anchor, the inner periphery comprising: - a concave locking feature (243A, 243B) disposed in the inner periphery, and - a convex locking feature (241A, 241B) disposed in the inner periphery, the concave locking feature spaced apart from the convex locking feature, wherein the distal portion comprises a first distal section (405A; 505A; 605A; 805A; 905A) and a second distal section (405B; 505B; 605B; 805B; 905B) distal the first distal section, the second distal section comprising fins (409; 509; 609; 709; 809; 909) extending distally from the first distal section, and wherein radial projections (406A, 406B; 506A, 506B; 606A, 606B) extending radially outward from the stemless humeral anchor (403; 503; 603; 703; 803; 903) and the fins (409; 509; 609; 709; 809; 909) cooperate to define radially- and distally-extending fin structures for securing the stemless humeral anchor to the humerus, each of the radially- and distally-extending fin structures having a common outer rib (418; 518) and extending from the proximal end (439; 539; 639; 839; 939) of the stemless humeral anchor to the distal end of the stemless humeral anchor. - a distal portion extending proximally from a distal end of the stemless humeral anchor, the distal portion being configured to occupy a portion of a metaphysis of a humerus when implanted, - a proximal portion (407; 507; 607; 807; 907) extending distally from a proximal end (439; 539; 639; 839; 939) of the stemless humeral anchor, - a first recess extending distally from the proximal end of the stemless humeral anchor and into the proximal portion, and - an inner periphery disposed about the first recess adjacent to the proximal end of the stemless humeral anchor, the inner periphery comprising: - a concave locking feature (243A, 243B) disposed in the inner periphery, and - a convex locking feature (241A, 241B) disposed in the inner periphery, the concave locking feature spaced apart from the convex locking feature, - a concave locking feature (243A, 243B) disposed in the inner periphery, and - a convex locking feature (241A, 241B) disposed in the inner periphery, the concave locking feature spaced apart from the convex locking feature, wherein the distal portion comprises a first distal section (405A; 505A; 605A; 805A; 905A) and a second distal section (405B; 505B; 605B; 805B; 905B) distal the first distal section, the second distal section comprising fins (409; 509; 609; 709; 809; 909) extending distally from the first distal section, and wherein radial projections (406A, 406B; 506A, 506B; 606A, 606B) extending radially outward from the stemless humeral anchor (403; 503; 603; 703; 803; 903) and the fins (409; 509; 609; 709; 809; 909) cooperate to define radially- and distally-extending fin structures for securing the stemless humeral anchor to the humerus, each of the radially- and distally-extending fin structures having a common outer rib (418; 518) and extending from the proximal end (439; 539; 639; 839; 939) of the stemless humeral anchor to the distal end of the stemless humeral anchor.