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Unformatted text preview: ogical features. The tissues around the loosened noncemented socket contained signiﬁcantly more
particles and concomitantly more giant cells (Fig. 5).
Although little difference was seen between Kyocera
and Charnley type prostheses ﬁxed with cement, the
prosthesis without cement (Omniﬂex/Omniﬁt) resulted
in more particles. The histological data from all samples
are shown in Table 3.
To determine the mechanism of osteolysis, we examined the granulation tissues around the stem of a patient
with massive osteolysis. The patient was a 56-year-old
man (case 19) who had received an Omniﬁt femoral
head replacement for avascular necrosis 13 years earlier. A radiolucent area around the stem was noticed 7
years after the primary operation. A prerevision radiograph showed massive osteolysis, and numerous giant
cells engulﬁng polyethylene particles were demon- Fig. 3a–d. Distribution of histologic grading of histiocytes,
giant cells, and polyethylene
particles in all samples from
aseptic loosening. a Total
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- Spring '08