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Journal of Clinical Pathology logoLink to Journal of Clinical Pathology
. 1999 Feb;52(2):118–123. doi: 10.1136/jcp.52.2.118

An assessment of the histological criteria used to diagnose infection in hip revision arthroplasty tissues.

R Pandey 1, E Drakoulakis 1, N A Athanasou 1
PMCID: PMC501055  PMID: 10396239

Abstract

AIM: To characterise the number and nature of the inflammatory cells seen in cases of septic or aseptic loosening of hip arthroplasty, and to establish reliable histological criteria to distinguish between these two conditions. METHODS: Histological examination of paraffin sections of periprosthetic tissues (pseudocapsule, femoral and acetabular pseudomembranes) of 523 cases of aseptic loosening and 79 cases of microbiology culture proven septic loosening. The cellular composition of the inflammatory cell infiltrate was determined semiquantitatively. RESULTS: The finding of a 2+ or greater neutrophil polymorph infiltrate (one or more cells per high power field (x400) on average after examination of 10 fields) in arthroplasty tissues correlated strongly with the microbiological diagnosis of septic loosening: diagnostic sensitivity 100%, specificity 97%, accuracy 99%, positive predictive value 92%, negative predictive value 100%. The finding of a 3+ neutrophil polymorph infiltrate (five or more cells on average per high power field) had a diagnostic sensitivity of 72%, specificity 100%, accuracy 98%, positive predictive value 100%, and negative predictive value 97%. In some cases of septic loosening the finding of a heavy lymphocytic and plasma cell infiltrate was of low diagnostic sensitivity. A neutrophil polymorph infiltrate (generally less than one cell per 10 high power fields) was also seen in cases of aseptic loosening. CONCLUSIONS: The presence of 2+ or more (more than one neutrophil polymorph per high power field (x400) on average after examination of at least 10 high power fields) in periprosthetic tissues provides the most sensitive and accurate histopathological criterion for distinguishing between septic and aseptic loosening of hip arthroplasty.

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Selected References

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