Fig. 3From: Comparison of collum femoris-preserving stems and ribbed stems in primary total hip arthroplastyPreoperative anteroposterior radiograph of a 36-year-old woman showing femoral head osteonecrosis of the right hip (a). Anteroposterior radiograph 3 weeks after THA using a ribbed stem (b). Anteroposterior radiograph at 2-year follow-up showing osteolysis in Gruen zone 7 (c)Back to article page