Fig. 7

Registration surface for a patient-specific instrument is guided by surgical exposure of proximal femur following standard of care; a. anterior registration surface is selected to ensure clearance from head-neck junction, fit patient’s femoral-shaft anatomy (starting below the greater trochanter and ending above the foveal wire’s exit point); b. lateral registration surface accommodates wire distribution; c. superior registration surface relies on surgical access to femoral neck’s mid-line; d. overall registration surface; e. final instrument design with break-away notch to ensure easy removal; f. placement and use of a representative drill guides in a simulated surgery