The British Journal of Rheumatology, Vol 37, 961-968, Copyright © 1998 by British Society for Rheumatology
T Conrozier, CA Jousseaume, P Mathieu, AM Tron, J Caton, J Bejui and E Vignon
OBJECTIVES: To evaluate the rate of progression of radiological joint space
narrowing (JSN) in patients operated on for hip osteoarthritis (OA) and to
determine its predictive factors. METHODS: Study design: retrospective
longitudinal trial of 61 patients who underwent total hip arthroplasty
(THA) for hip OA (69 operated hips). Mean follow-up 81.2 +/- 9.9 months.
Collected data: (1) standing frontal radiographs of the pelvis from
diagnosis to surgery (246 films) for morphological evaluation and
quantitative measurement of joint space width (JSW) (computerized reading
of digitized X-rays); (2) demographic data (sex, age, body mass index,
smoking status, professional and sporting activities, family history of
OA); (3) clinical data (age at onset- diagnosis and THA, drug consumption,
time from diagnosis to permanent disability, OA at other joints, previous
THA of the contralateral hip). Statistics: multivariate analysis. RESULTS:
The yearly mean narrowing (YMN) of MeanJSW was 0.43 +/- 0.43 mm/yr (median
0.29, range 0.03- 2.55). YMN correlated inversely with joint space width at
operation and follow-up duration, and was increased in atrophic OA (r =
0.71). The time between diagnosis and THA correlated with JSW at diagnosis,
and was inversely correlated with age at onset and YMN. It was longer in
patients with hypertrophic OA (r = 0.69). CONCLUSION: Rapid progression of
JSN, older age and absence of osteophytes appear to be the main factors
leading to THA.
ORIGINAL PAPERS
Quantitative measurement of joint space narrowing progression in hip osteoarthritis: a longitudinal retrospective study of patients treated by total hip arthroplasty
Service de rhumatologie, Centre hospitalier Lyon-Sud, Pierre-Benite, France.
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