A bone fastener (42; 242; 442; 642) comprising: a head (44; 244; 444; 644) extending along an axis (F; F1; F2; F3) and including an inner surface defining an implant cavity (50; 250; 450; 650); a base (58; 258; 458; 658) configured for fixation with the head (44; 244; 444; 644) and including a wall, the wall defining a groove (90; 290; 690) and including an inner surface (84; 284; 684) that defines a first mating surface, the wall further including a lateral surface that defines a cavity (74; 274; 674); a crown (88; 288; 488; 688) configured for fixation with the base (58; 258; 458; 658) and including a wall, the wall including a second mating surface (102; 302) engageable with the first mating surface; a ring (92; 292; 692) having a band portion that defines an opening (110; 710), and a shaft (80; 280; 480; 680) including a first end (114; 314; 514; 714) disposed within the base (58; 258; 458; 658) and a second end (116; 316; 516; 716) configured to penetrate tissue, characterized in that the band portion is disposable with the groove (90;290;690) such that the opening (110; 710) is aligned with the cavity (74; 274; 674); and wherein the band portion of the ring (92; 292; 692) is configured to engage an outer surface of the shaft (80; 280; 680) to prevent axial translation of shaft (80; 280; 680) relative to base (58; 258; 458; 658), and wherein the opening (110; 710) is aligned with the cavity (74; 274; 674) when the band portion engages the outer surface of shaft (80; 280; 680) to permit the shaft (80; 280; 680) to be moved relative to the head (44; 244; 644) between a first orientation and a second orientation such that at least a portion of the shaft (80; 280; 680) is disposed in the cavity (74; 274; 674). a head (44; 244; 444; 644) extending along an axis (F; F1; F2; F3) and including an inner surface defining an implant cavity (50; 250; 450; 650); a base (58; 258; 458; 658) configured for fixation with the head (44; 244; 444; 644) and including a wall, the wall defining a groove (90; 290; 690) and including an inner surface (84; 284; 684) that defines a first mating surface, the wall further including a lateral surface that defines a cavity (74; 274; 674); a crown (88; 288; 488; 688) configured for fixation with the base (58; 258; 458; 658) and including a wall, the wall including a second mating surface (102; 302) engageable with the first mating surface; a ring (92; 292; 692) having a band portion that defines an opening (110; 710), and a shaft (80; 280; 480; 680) including a first end (114; 314; 514; 714) disposed within the base (58; 258; 458; 658) and a second end (116; 316; 516; 716) configured to penetrate tissue, characterized in that the band portion is disposable with the groove (90;290;690) such that the opening (110; 710) is aligned with the cavity (74; 274; 674); and wherein the band portion of the ring (92; 292; 692) is configured to engage an outer surface of the shaft (80; 280; 680) to prevent axial translation of shaft (80; 280; 680) relative to base (58; 258; 458; 658), and wherein the opening (110; 710) is aligned with the cavity (74; 274; 674) when the band portion engages the outer surface of shaft (80; 280; 680) to permit the shaft (80; 280; 680) to be moved relative to the head (44; 244; 644) between a first orientation and a second orientation such that at least a portion of the shaft (80; 280; 680) is disposed in the cavity (74; 274; 674). <EOS>