A surgical resection guide comprising: a housing (36) a stylus arm (38) extending through the housing (36) arranged such that when the housing (36) is coupled to the side of a bone, a tip of the stylus arm (38) is arranged to contact an end of a bone and a linear adjustment mechanism. The linear adjustment mechanism comprises: a shaft (30) at least partially received within a bore extending through the housing (36) such that the shaft (30) can slide along its longitudinal axis relative to the housing (36), the shaft (30) incorporating a shaft tooth or groove (50) and a dial (44) rotatably coupled to the housing (36) and incorporating a helical dial groove or rib (48) defining a longitudinal axis offset from the longitudinal axis of the shaft (30). The shaft tooth or groove (50) engages the dial groove or rib (48) such that rotating the dial (44) relative to the housing (36) causes the shaft tooth or groove (50) to slide along the dial groove or rib (48) causing the shaft (30) to slide within the bore along its longitudinal axis. The housing (36) and the stylus arm (38) can rotate about the shaft (30) without causing the shaft (30) to slide within its bore along its longitudinal axis. A method of adjusting the surgical resection guide is also disclosed.
