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We thank Dr Chan and Dr Wen for their interest in our report1 and their resulting eLetter.2 We fully agree that, among the different components of metabolic syndrome (MetS), hypertension has very recently been brought out as a critical feature in the development of osteoarthritis (OA) in humans.3 4 In these reports using either data from the Framingham OA study3 or the Osteoarthritis Initiative study,4 it has been emphasised that high blood pressure (diastolic or systolic, respectively) was associated with increased incidence of radiographic knee OA.
In order to further experimentally investigate the actual role of hypertension in OA onset and development, Chan and colleagues describe in a yet unpublished study the development of OA features in the spontaneous hypertensive rat (SHR) model, a widely characterised model of systemic hypertension.2 5 Although the spontaneous hypertensive heart failure (SHHF) rat strain we employed is deriving from the SHR strain6 and suffers high …
↵* HK and AP are joint senior authors
Contributors HK and AP: concept, writing; CD, AB, NP, DM, MK, CG, HK and AP: final approval.
Competing interests None declared.
Provenance and peer review Commissioned; internally peer reviewed.