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<title>UTas ePrints - A longitudinal study of the effect of sex and age on rate of change in knee cartilage volume in adults</title>
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<meta content="Ding, Changhai" name="eprints.creators_name" />
<meta content="Cicuttini, Flavia" name="eprints.creators_name" />
<meta content="Blizzard, Leigh" name="eprints.creators_name" />
<meta content="Scott, Fiona" name="eprints.creators_name" />
<meta content="Jones, Graeme" name="eprints.creators_name" />
<meta content="chding@utas.edu.au" name="eprints.creators_id" />
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<meta content="2007-05-04" name="eprints.datestamp" />
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<meta content="A longitudinal study of the effect of sex and age on rate of change in knee cartilage volume in adults" name="eprints.title" />
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<meta content="Knee, Cartilage volume, Sex, Age, Osteoarthritis" name="eprints.keywords" />
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<meta content="Objective. To describe the association between sex, age and rate of change in knee cartilage volume in adults.
Methods. A total of 325 subjects (mean age 45 yrs, range 26-61) was measured at baseline and 2 yrs later. Knee cartilage volume and bone size were determined using T1-weighted fat saturation magnetic resonance imaging (MRI). Height, weight, body mass index and radiographic osteoarthritis (ROA) were measured by standard protocols.
Results. Knee cartilage volume decreased by 1.5-4.2% per annum. In multivariable analysis, females had higher rates of change per annum in knee cartilage volume than males (medial tibia: -3.5%, P < 0.001; lateral tibia: -2.6%, P < 0.001 and patella: -0.8%, P = 0.053). The sex difference first appeared at age 40 and became more marked with increasing age at the medial tibial site only (P = 0.039). Age was significantly associated with annual change in knee cartilage volume at all three sites (beta = -0.06 to -0.12%/yr, all P < 0.05), and these associations were stronger in females. With the exception of the medial site (beta = -0.05/yr, P = 0.117 for ROA exclusion, and beta = -0.06%/yr, P = 0.056 for ROA adjustment), the association with age did not change when subjects with ROA were excluded from analyses or after further adjustment for ROA.
Conclusions. Within the age range we studied, knee cartilage volume declines at a faster rate with increasing age. This is partly mediated by ROA at the medial tibial site only. Furthermore, women have substantially higher knee cartilage loss than men, and these sex differences first appear at age 40 and become more marked with increasing age, which has implications for prevention of cartilage loss from middle age.
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<meta content="321028 Rheumatology and Arthritis" name="DC.subject" />
<meta content="Objective. To describe the association between sex, age and rate of change in knee cartilage volume in adults.
Methods. A total of 325 subjects (mean age 45 yrs, range 26-61) was measured at baseline and 2 yrs later. Knee cartilage volume and bone size were determined using T1-weighted fat saturation magnetic resonance imaging (MRI). Height, weight, body mass index and radiographic osteoarthritis (ROA) were measured by standard protocols.
Results. Knee cartilage volume decreased by 1.5-4.2% per annum. In multivariable analysis, females had higher rates of change per annum in knee cartilage volume than males (medial tibia: -3.5%, P < 0.001; lateral tibia: -2.6%, P < 0.001 and patella: -0.8%, P = 0.053). The sex difference first appeared at age 40 and became more marked with increasing age at the medial tibial site only (P = 0.039). Age was significantly associated with annual change in knee cartilage volume at all three sites (beta = -0.06 to -0.12%/yr, all P < 0.05), and these associations were stronger in females. With the exception of the medial site (beta = -0.05/yr, P = 0.117 for ROA exclusion, and beta = -0.06%/yr, P = 0.056 for ROA adjustment), the association with age did not change when subjects with ROA were excluded from analyses or after further adjustment for ROA.
Conclusions. Within the age range we studied, knee cartilage volume declines at a faster rate with increasing age. This is partly mediated by ROA at the medial tibial site only. Furthermore, women have substantially higher knee cartilage loss than men, and these sex differences first appear at age 40 and become more marked with increasing age, which has implications for prevention of cartilage loss from middle age.
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<h1 class="ep_tm_pagetitle">A longitudinal study of the effect of sex and age on rate of change in knee cartilage volume in adults</h1>
<p style="margin-bottom: 1em" class="not_ep_block"><span class="person_name">Ding, Changhai</span> and <span class="person_name">Cicuttini, Flavia</span> and <span class="person_name">Blizzard, Leigh</span> and <span class="person_name">Scott, Fiona</span> and <span class="person_name">Jones, Graeme</span> (2007) <xhtml:em>A longitudinal study of the effect of sex and age on rate of change in knee cartilage volume in adults.</xhtml:em> Rheumatology, 46 (2). pp. 273-279. ISSN 1462-0332</p><p style="margin-bottom: 1em" class="not_ep_block"></p><table style="margin-bottom: 1em" class="not_ep_block"><tr><td valign="top" style="text-align:center"><a href="http://eprints.utas.edu.au/937/1/rheumatology2007.pdf"><img alt="[img]" src="http://eprints.utas.edu.au/style/images/fileicons/application_pdf.png" class="ep_doc_icon" border="0" /></a></td><td valign="top"><a href="http://eprints.utas.edu.au/937/1/rheumatology2007.pdf"><span class="ep_document_citation">PDF</span></a> - Full text restricted - Requires a PDF viewer<br />200Kb</td></tr></table><p style="margin-bottom: 1em" class="not_ep_block">Official URL: <a href="http://dx.doi.org/10.1093/rheumatology/kel243">http://dx.doi.org/10.1093/rheumatology/kel243</a></p><div class="not_ep_block"><h2>Abstract</h2><p style="padding-bottom: 16px; text-align: left; margin: 1em auto 0em auto">Objective. To describe the association between sex, age and rate of change in knee cartilage volume in adults.
Methods. A total of 325 subjects (mean age 45 yrs, range 26-61) was measured at baseline and 2 yrs later. Knee cartilage volume and bone size were determined using T1-weighted fat saturation magnetic resonance imaging (MRI). Height, weight, body mass index and radiographic osteoarthritis (ROA) were measured by standard protocols.
Results. Knee cartilage volume decreased by 1.5-4.2% per annum. In multivariable analysis, females had higher rates of change per annum in knee cartilage volume than males (medial tibia: -3.5%, P < 0.001; lateral tibia: -2.6%, P < 0.001 and patella: -0.8%, P = 0.053). The sex difference first appeared at age 40 and became more marked with increasing age at the medial tibial site only (P = 0.039). Age was significantly associated with annual change in knee cartilage volume at all three sites (beta = -0.06 to -0.12%/yr, all P < 0.05), and these associations were stronger in females. With the exception of the medial site (beta = -0.05/yr, P = 0.117 for ROA exclusion, and beta = -0.06%/yr, P = 0.056 for ROA adjustment), the association with age did not change when subjects with ROA were excluded from analyses or after further adjustment for ROA.
Conclusions. Within the age range we studied, knee cartilage volume declines at a faster rate with increasing age. This is partly mediated by ROA at the medial tibial site only. Furthermore, women have substantially higher knee cartilage loss than men, and these sex differences first appear at age 40 and become more marked with increasing age, which has implications for prevention of cartilage loss from middle age.
</p></div><table style="margin-bottom: 1em" cellpadding="3" class="not_ep_block" border="0"><tr><th valign="top" class="ep_row">Item Type:</th><td valign="top" class="ep_row">Article</td></tr><tr><th valign="top" class="ep_row">Additional Information:</th><td valign="top" class="ep_row">The definitive publisher-authenticated version of Rheumatology 2007; 46: 273-279 is available online at: http://rheumatology.oxfordjournals.org/cgi/content/full/46/2/273</td></tr><tr><th valign="top" class="ep_row">Keywords:</th><td valign="top" class="ep_row">Knee, Cartilage volume, Sex, Age, Osteoarthritis</td></tr><tr><th valign="top" class="ep_row">Subjects:</th><td valign="top" class="ep_row"><a href="http://eprints.utas.edu.au/view/subjects/321028.html">320000 Medical and Health Sciences > 321000 Clinical Sciences > 321028 Rheumatology and Arthritis</a></td></tr><tr><th valign="top" class="ep_row">ID Code:</th><td valign="top" class="ep_row">937</td></tr><tr><th valign="top" class="ep_row">Deposited By:</th><td valign="top" class="ep_row"><span class="ep_name_citation"><span class="person_name">Dr Changhai / C Ding</span></span></td></tr><tr><th valign="top" class="ep_row">Deposited On:</th><td valign="top" class="ep_row">04 May 2007</td></tr><tr><th valign="top" class="ep_row">Last Modified:</th><td valign="top" class="ep_row">09 Jan 2008 02:30</td></tr><tr><th valign="top" class="ep_row">ePrint Statistics:</th><td valign="top" class="ep_row"><a target="ePrintStats" href="/es/index.php?action=show_detail_eprint;id=937;">View statistics for this ePrint</a></td></tr></table><p align="right">Repository Staff Only: <a href="http://eprints.utas.edu.au/cgi/users/home?screen=EPrint::View&eprintid=937">item control page</a></p>
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