Abstract
The purpose of this study is to clarify the cause of pain at the thigh region after Batemen UPF. The 35 patients evaluated have an average follow-up of 24 months. The age range is from 23 to 88 with an average of 62.1 years. Pain occurred frequently in the cases which Curved Moore type was used and the stem was inserted in varus position. On the other hand, there were no patients with pain in cemented cases. Bone reaction of the stem tip was extremely differed between curved type and straight type. The cause of pain at the thigh region was abnormal movement and the shape of the stem tip.
