An implant system for securing a prosthesis to a prepared site within a selected bone of a tissue region of a subject, the implant system comprising: a stem having a longitudinal axis and a longitudinal length, the stem comprising: an elongate shaft portion having an outer surface and defining an insertional end of the stem, the insertional end of the stem configured for receipt within the prepared site, the elongate shaft portion comprising a porous region having a selected length along the longitudinal axis of the stem, wherein the ratio between the longitudinal length of the stem and the selected length of the porous region ranges from about 3:1 to about 10:1; and a collar portion defining a second end of the stem, the second end of the stem being spaced from the insertional end of the stem along the longitudinal axis of the stem, the collar portion defining a shoulder surface extending radially outwardly from the outer surface of the elongate shaft portion; an abutment having a longitudinal axis, an attachment element, and a post having an outer surface and being operatively coupled to the attachment element, at least a portion of the post being configured for selective secure attachment to the prosthesis; wherein, upon secure receipt of the stem within the prepared site, the porous region of the stem is configured to promote integration of the selected bone of the subject and the stem and the shoulder surface is configured to abut the selected bone; characterized in that: the collar portion and the elongate shaft portion cooperate to define a central bore extending along at least a portion of the longitudinal length of the stem; the attachment element of the abutment is configured for complementary receipt within the central bore of the stem such that the longitudinal axis of the abutment is substantially aligned with the longitudinal axis of the stem; and at least a portion of the outer surface of the post of the abutment is configured to inhibit bio-adhesion. a stem having a longitudinal axis and a longitudinal length, the stem comprising: an elongate shaft portion having an outer surface and defining an insertional end of the stem, the insertional end of the stem configured for receipt within the prepared site, the elongate shaft portion comprising a porous region having a selected length along the longitudinal axis of the stem, wherein the ratio between the longitudinal length of the stem and the selected length of the porous region ranges from about 3:1 to about 10:1; and a collar portion defining a second end of the stem, the second end of the stem being spaced from the insertional end of the stem along the longitudinal axis of the stem, the collar portion defining a shoulder surface extending radially outwardly from the outer surface of the elongate shaft portion; an abutment having a longitudinal axis, an attachment element, and a post having an outer surface and being operatively coupled to the attachment element, at least a portion of the post being configured for selective secure attachment to the prosthesis; wherein, upon secure receipt of the stem within the prepared site, the porous region of the stem is configured to promote integration of the selected bone of the subject and the stem and the shoulder surface is configured to abut the selected bone; characterized in that: the collar portion and the elongate shaft portion cooperate to define a central bore extending along at least a portion of the longitudinal length of the stem; the attachment element of the abutment is configured for complementary receipt within the central bore of the stem such that the longitudinal axis of the abutment is substantially aligned with the longitudinal axis of the stem; and at least a portion of the outer surface of the post of the abutment is configured to inhibit bio-adhesion. an elongate shaft portion having an outer surface and defining an insertional end of the stem, the insertional end of the stem configured for receipt within the prepared site, the elongate shaft portion comprising a porous region having a selected length along the longitudinal axis of the stem, wherein the ratio between the longitudinal length of the stem and the selected length of the porous region ranges from about 3:1 to about 10:1; and a collar portion defining a second end of the stem, the second end of the stem being spaced from the insertional end of the stem along the longitudinal axis of the stem, the collar portion defining a shoulder surface extending radially outwardly from the outer surface of the elongate shaft portion; an abutment having a longitudinal axis, an attachment element, and a post having an outer surface and being operatively coupled to the attachment element, at least a portion of the post being configured for selective secure attachment to the prosthesis; wherein, upon secure receipt of the stem within the prepared site, the porous region of the stem is configured to promote integration of the selected bone of the subject and the stem and the shoulder surface is configured to abut the selected bone; the collar portion and the elongate shaft portion cooperate to define a central bore extending along at least a portion of the longitudinal length of the stem; the attachment element of the abutment is configured for complementary receipt within the central bore of the stem such that the longitudinal axis of the abutment is substantially aligned with the longitudinal axis of the stem; and at least a portion of the outer surface of the post of the abutment is configured to inhibit bio-adhesion.