An orthopedic implant, comprising: a body having an articulating surface and a surface opposite the articulating surface, said surface opposite the articulating surface including a fixation feature, said fixation feature configured to have a variable width for fastening the implant to a fixation bore formed in a bone; characterized in that said fixation feature comprises: an expander portion; and an expandable portion comprising one or more expandable parts coupled together to form a cylinder comprising an expansion bore defined by inner surfaces of the one or more expandable parts, said expansion bore formed along a longitudinal axis of the cylinder, portions of said inner surfaces comprising one or more cam surfaces, wherein the expander portion comprises: an insertion body configured to be inserted into the expansion bore, said insertion body having one or more cams configured to engage the one or more cam surfaces for expanding a width of said expandable portion when the expander portion is inserted into the expansion bore and rotated about the longitudinal axis; and an end segment comprising: a locking portion coupled to the insertion body, and a keyed portion coupled to the locking portion, wherein said locking portion is configured to receive a rotation lock through an opening of said body to lock the expander portion from rotating about the longitudinal axis after the expander portion is inserted into the expansion bore and rotated about the longitudinal axis, and wherein said keyed portion is configured to receive a tool for rotating the expander portion about the longitudinal axis. a body having an articulating surface and a surface opposite the articulating surface, said surface opposite the articulating surface including a fixation feature, said fixation feature configured to have a variable width for fastening the implant to a fixation bore formed in a bone; characterized in that said fixation feature comprises: an expander portion; and an expandable portion comprising one or more expandable parts coupled together to form a cylinder comprising an expansion bore defined by inner surfaces of the one or more expandable parts, said expansion bore formed along a longitudinal axis of the cylinder, portions of said inner surfaces comprising one or more cam surfaces, wherein the expander portion comprises: an insertion body configured to be inserted into the expansion bore, said insertion body having one or more cams configured to engage the one or more cam surfaces for expanding a width of said expandable portion when the expander portion is inserted into the expansion bore and rotated about the longitudinal axis; and an end segment comprising: a locking portion coupled to the insertion body, and a keyed portion coupled to the locking portion, wherein said locking portion is configured to receive a rotation lock through an opening of said body to lock the expander portion from rotating about the longitudinal axis after the expander portion is inserted into the expansion bore and rotated about the longitudinal axis, and wherein said keyed portion is configured to receive a tool for rotating the expander portion about the longitudinal axis. an expander portion; and an expandable portion comprising one or more expandable parts coupled together to form a cylinder comprising an expansion bore defined by inner surfaces of the one or more expandable parts, said expansion bore formed along a longitudinal axis of the cylinder, portions of said inner surfaces comprising one or more cam surfaces, wherein the expander portion comprises: an insertion body configured to be inserted into the expansion bore, said insertion body having one or more cams configured to engage the one or more cam surfaces for expanding a width of said expandable portion when the expander portion is inserted into the expansion bore and rotated about the longitudinal axis; and an end segment comprising: a locking portion coupled to the insertion body, and a keyed portion coupled to the locking portion, wherein said locking portion is configured to receive a rotation lock through an opening of said body to lock the expander portion from rotating about the longitudinal axis after the expander portion is inserted into the expansion bore and rotated about the longitudinal axis, and wherein said keyed portion is configured to receive a tool for rotating the expander portion about the longitudinal axis. an insertion body configured to be inserted into the expansion bore, said insertion body having one or more cams configured to engage the one or more cam surfaces for expanding a width of said expandable portion when the expander portion is inserted into the expansion bore and rotated about the longitudinal axis; and an end segment comprising: a locking portion coupled to the insertion body, and a keyed portion coupled to the locking portion, wherein said locking portion is configured to receive a rotation lock through an opening of said body to lock the expander portion from rotating about the longitudinal axis after the expander portion is inserted into the expansion bore and rotated about the longitudinal axis, and wherein said keyed portion is configured to receive a tool for rotating the expander portion about the longitudinal axis.