A talar component 58 comprises a superior surface profiled to receive a talar bearing, and a concave inferior surface 62. The inferior surface 62 has three planar contiguous surface portions 64a, 64b, 64c which are angled relative to each other, and each surface portion 64a, 64b, 64c extends across or substantially across a lateral extent of the talar component 58. Also disclosed are a resecting jig including a tibia distal cutting guide and a talus superior cutting guide (fig. 1), and a resecting jig in which a cutting guide is supported by a support element of the jig which engages with the tibia and/or the talus (fig. 4).
