Malalignment and distal contact of short tapered stems could be associated with postoperative thigh pain in primary total hip arthroplasty

摘要

a–c A representative image for type II fit. This patient was a 66-year-old woman who underwent THA at age 65 using a short tapered stem. a A preoperative AP radiograph of her left hip. b A 6-month postoperative AP radiograph of the hip. c A 6-month postoperative lateral radiograph of the hip. The following parameters were measured: (d) metaphyseal diameter 2 cm above the level of the lesser trochanter midpoint, (e) isthmus diameter which represents the width of the narrowest part of the proximal femoral canal, (f) diameter of the femoral shaft which is measured 10 cm distal to the center of the small trochanter, (g) internal width of the medullar canal which is measured 10 cm distal to the center of the small trochanter, (h) width of the stem which is measured at the proximal end of stem tip arc, (i) internal width of the medullar canal which is measured at the proximal end of the tip arc, (j) width of the stem which is measured at the distal end of porous coating, and (k) internal width of the medullar canal which is measured at the distal end of porous coating