Femoral stem design method

A femoral stem design method comprising:

• a data collection step of collecting femur data obtained along a coronal plane from a plurality of patients;
• a measurement standard setting step of setting a standard for designing a femoral stem with respect to the femur data of the plurality of patients collected in the data collection step;
• a measurement step of measuring a predetermined part of the femur from the femur data of the plurality of patients;
• a dimension determination step of determining a dimension of each part of a plurality of implants to be inserted into the femur;
• and
• a shape determination step of determining shapes of the plurality of implants according to the dimension of the plurality of implants determined in the dimension determination step,
• wherein the measurement standard setting step comprises:
• a boundary setting step of setting a boundary that distinguishes the cortical bone and the cancellous bone from the femur data of the plurality of patients;
• and
• an axis setting step of setting an axis extending from the proximal part to the distal part of the femur,
• wherein the measurement step is performed by measuring only the following data of essential parts for designing a size and a shape of an implant:
• a width from the axis to a lateral boundary at a first position spaced by a predetermined distance proximally apart from the lesser trochanter of the femur along the axis, for designing a proximal part of the implant;
• a width from the axis to a medial boundary at the first position, for designing the proximal part of the implant;
• and
• a width from the medial boundary to the lateral boundary at a second position spaced by a predetermined distance distally apart from the lesser trochanter of the femur along the axis, for designing a distal part of the implant.