A tendon anchoring system, comprising: an outer shaft (606, 706, 806, 906, 1006, 1206, 1306) having an inner lumen extending therethrough and a sheath alignment protrusion (1312, 1362) formed on a distal end thereof; an inner shaft (610, 710, 810, 910, 1010, 1210, 1310) disposed within the outer shaft (606, 706, 806, 906, 1006, 1206, 1306) and having first and second prongs (324a, 324b; 1324a, 1324b; 1374a, 1374b) formed on a distal end thereof, the prongs (324a, 324b; 1324a, 1324b; 1374a, 1374b) being movable between an extended position in which the prongs (324a, 324b; 1324a, 1324b; 1374a, 1374b) extend distally beyond the distal end of the outer shaft (606, 706, 806, 906, 1006, 1206, 1306), and a retracted position in which the prongs (324a, 324b; 1324a, 1324b; 1374a, 1374b) are retracted into the distal end of the outer shaft (606, 706, 806, 906, 1006, 1206, 1306), the prongs (324a, 324b; 1324a, 1324b; 1374a, 1374b) extending along opposed sides of the sheath alignment protrusion (1312, 1362) on the outer shaft (606, 706, 806, 906, 1006, 1206, 1306), the prongs (324a, 324b; 1324a, 1324b; 1374a, 1374b) being configured to extend along opposed sidewall slots formed in a sheath of an anchor assembly, wherein the sheath of the anchor assembly is configured to receive an expander to expand the sheath and thereby anchor it to bone; a handle assembly (602, 702, 802, 902, 1002, 1202) coupled to a proximal end of each of the inner and outer shafts, wherein the handle assembly (602, 702, 802, 902, 1002, 1202) includes an actuator (604, 704, 804, 904, 1004, 1204) coupled to the inner shaft (610, 710, 810, 910, 1010, 1210, 1310) and configured to cause axial translation of the inner and outer shafts relative to one another, thereby permitting the inner shaft (610, 710, 810, 910, 1010, 1210, 1310) to retract relative to the outer shaft (606, 706, 806, 906, 1006, 1206, 1306) without rotating. an outer shaft (606, 706, 806, 906, 1006, 1206, 1306) having an inner lumen extending therethrough and a sheath alignment protrusion (1312, 1362) formed on a distal end thereof; an inner shaft (610, 710, 810, 910, 1010, 1210, 1310) disposed within the outer shaft (606, 706, 806, 906, 1006, 1206, 1306) and having first and second prongs (324a, 324b; 1324a, 1324b; 1374a, 1374b) formed on a distal end thereof, the prongs (324a, 324b; 1324a, 1324b; 1374a, 1374b) being movable between an extended position in which the prongs (324a, 324b; 1324a, 1324b; 1374a, 1374b) extend distally beyond the distal end of the outer shaft (606, 706, 806, 906, 1006, 1206, 1306), and a retracted position in which the prongs (324a, 324b; 1324a, 1324b; 1374a, 1374b) are retracted into the distal end of the outer shaft (606, 706, 806, 906, 1006, 1206, 1306), the prongs (324a, 324b; 1324a, 1324b; 1374a, 1374b) extending along opposed sides of the sheath alignment protrusion (1312, 1362) on the outer shaft (606, 706, 806, 906, 1006, 1206, 1306), the prongs (324a, 324b; 1324a, 1324b; 1374a, 1374b) being configured to extend along opposed sidewall slots formed in a sheath of an anchor assembly, wherein the sheath of the anchor assembly is configured to receive an expander to expand the sheath and thereby anchor it to bone; a handle assembly (602, 702, 802, 902, 1002, 1202) coupled to a proximal end of each of the inner and outer shafts, wherein the handle assembly (602, 702, 802, 902, 1002, 1202) includes an actuator (604, 704, 804, 904, 1004, 1204) coupled to the inner shaft (610, 710, 810, 910, 1010, 1210, 1310) and configured to cause axial translation of the inner and outer shafts relative to one another, thereby permitting the inner shaft (610, 710, 810, 910, 1010, 1210, 1310) to retract relative to the outer shaft (606, 706, 806, 906, 1006, 1206, 1306) without rotating.