Twenty-eight patients in seventy-three patients who were diagnosed ankylosing spondylitis underwentforty-five total hip arthroplsties. Thirty-seven hips were the cementless type, and eight hips were the cemented type. There were twenty-six males
and two
females. Seventeen patients were bilateralinvolvement. In forty-five total hip arthroplasties, twenty-eight hips(62%) were total ankylosis, seventeen hips(38%) were partial ankylosis. Their mean age at the operation was 39(19-63) years. Thisage
seems to
be a little young. The follow-up period was minimum one year and maximum seven years, theaverage being three years and four months. Six patients(21%) needed endotracheal intubation under fiberoptic laryngoscopic guide for generalanesthesia.
Associated
additional procedures such as Yount's operation or Campbell's operation wereperformed in fifteen hips(33%). Thirth-four(76%) hips had a excellent result; seven(15%), a goodresult; one(3%), a fair result; and three(6%), a poor result. Range of the
hip
motion after total hiparthroplasty was mucd less, but gain of the hip motion was remarkalbe.Pain improvement was striking in partially ankylosed hips, on the other hand motion gain was much moreimportant in completely ankylosed hips. The
incidence
of
radiolucent line around acetabular cup and femoral stem in roentgenographic examination was 15%. One hip showed definite loosening. Preoperativespinal ankylosis took part in occurrence of radiolucent lines around prostheses. Degree of ankylosisof
the
hip had not specific correlation with roentgenographic radiolucent lines around prostheses.Heterotopic ossificastion occurred in 20%. Preoperative ankyulosis of the spine and the hp, andenthesopathy had an important role to occur heterotopic
ossification. Cementless total hiparthroplasty appeared to be more superior to cemented total hip arthroplasty in ankylosing spondylitis.
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