A unicompartmental tibial component comprising: a plate having a bearing surface and an opposing surface that is configured to be secured to a proximal end of a patient's tibia, wherein the plate further comprises an anterior end, an outer side, a posterior end and an inner side, wherein a mediolateral width of the plate is defined between the outer and inner sides, and a longitudinal anteroposterior axis extends between the anterior and posterior ends approximately one third of the width of the plate from the lateral side, and defines a longitudinal anteroposterior axis length of the plate; a first elongate peg protruding from the opposing surface in the anterior portion, the first elongate peg defining a first peg axis; and a second elongate peg protruding from the opposing surface in the anterior portion, the second elongate peg defining a second peg axis; wherein the first and second peg (14, 16) axes are disposed at an angle of 45-70 degrees with respect to the longitudinal anteroposterior axis and are substantially parallel to one another such that the first and second pegs (14, 16) protrude posteriorly as well as distally with respect to the plate; wherein an anterior portion of the plate comprises a part of the plate defined by an anterior 60% or less of the longitudinal anteroposterior axis length, whilst a posterior portion of the plate comprises a part of the plate that is defined by the remaining posterior 40% or more of the longitudinal anteroposterior axis length, the posterior portion of the opposing surface being free from pegs or other fixation devices; and wherein the component is configured for cementless fixation using an interference fit, characterised in that the first and second elongate pegs (14, 16) are located more than half of the mediolateral width W of the plate from the outer side of the plate. a plate having a bearing surface and an opposing surface that is configured to be secured to a proximal end of a patient's tibia, wherein the plate further comprises an anterior end, an outer side, a posterior end and an inner side, wherein a mediolateral width of the plate is defined between the outer and inner sides, and a longitudinal anteroposterior axis extends between the anterior and posterior ends approximately one third of the width of the plate from the lateral side, and defines a longitudinal anteroposterior axis length of the plate; a first elongate peg protruding from the opposing surface in the anterior portion, the first elongate peg defining a first peg axis; and a second elongate peg protruding from the opposing surface in the anterior portion, the second elongate peg defining a second peg axis; wherein the first and second peg (14, 16) axes are disposed at an angle of 45-70 degrees with respect to the longitudinal anteroposterior axis and are substantially parallel to one another such that the first and second pegs (14, 16) protrude posteriorly as well as distally with respect to the plate; wherein an anterior portion of the plate comprises a part of the plate defined by an anterior 60% or less of the longitudinal anteroposterior axis length, whilst a posterior portion of the plate comprises a part of the plate that is defined by the remaining posterior 40% or more of the longitudinal anteroposterior axis length, the posterior portion of the opposing surface being free from pegs or other fixation devices; and wherein the component is configured for cementless fixation using an interference fit, characterised in that the first and second elongate pegs (14, 16) are located more than half of the mediolateral width W of the plate from the outer side of the plate.