Hip arthroplasty trial systems and associated medical devices, methods, and kits

A method for completing a hip arthroplasty trial comprising:

• obtaining a medical device for use in a hip arthroplasty trial, the medical device comprising:
• a head member comprising a head member first recess, a head member first end, a head member second end, a head member first lengthwise axis extending through the head member first end and the head member second end, a head member second lengthwise axis, and a head member second recess extending into the head member along the head member second lengthwise axis;
• a shaft, the shaft disposed within the head member second recess;
• and
• a spacer, the spacer having a spacer first end, a spacer second end, and a spacer length extending from the spacer first end to the spacer second end;
• positioning the spacer on an end of a femoral stem;
• positioning the spacer within the head member first recess;
• determining whether a desired offset between the head member and the femoral stem has been achieved;
• moving the shaft in situ such that the spacer translates relative to the head member;
• determining whether a desired offset between the head member and the femoral stem has been achieved;
• removing the head member from the femoral stem;
• obtaining a femoral head implant that corresponds to the desired offset between the head member and the femoral stem;
• and
• implanting the femoral head implant.

A method of completing a hip arthroplasty trial on a femur comprising:

• obtaining a medical device for use in said hip arthroplasty trial, the medical device comprising:
• a head member, the head member having a head member first end, a head member second end, and a head member first lengthwise axis extending through the head member first end and the head member second end;
• and
• a shaft;
• implanting a femoral stem into said femur;
• positioning the head member on the femoral stem;
• moving the shaft in situ in a first direction such that the head member moves away from the femoral stem until a desired offset between the head member and the femoral stem has been achieved;
• moving the shaft in situ in a second direction such that the head member moves toward the femoral stem;
• determining whether a desired offset between the head member and the femoral stem has been achieved;
• obtaining a femoral head implant that corresponds to the desired offset between the head member and the femoral stem;
• removing the head member from the femoral stem;
• and
• positioning the femoral head implant on the femoral stem,
• wherein the head member further comprises a first recess, a second recess, and a third recess, and wherein the method further comprises positioning a locking member within the head member third recess such that the shaft is releasably attached to the head member.