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Background:  Patients frequently consult the internet for health information. Our aim was to perform an Internet-based readability and quality control study using recognised quality scoring systems to assess the patient information available online relating to anaesthesia for total hip and knee replacement surgery.    Methods:  Online patient information relating to anaesthesia for total hip and knee replacement was identified using Google, Bing and Yahoo with search terms  ‘hip replacement anaesthetic’ ,  ‘knee replacement anaesthetic .’ Readability was assessed using Flesch Reading Ease (FRE), Flesch-Kincaid grade level (FKGL) and Gunning Fog Index (GFI). Quality was assessed using DISCERN instrument, Health On the Net Foundation seal, and Information Standard mark.    Results:  32 websites were analysed. 25% were HONcode certified, 15.6% had the Information Standard. Mean FRE was 55.2±12.8. Mean FKGL was 8.6±1.9. Six websites (18.8%) had the recommended 6  th -grade readability level. Mean of 10.4±2.6 years of formal education was required to read the websites. Websites with Information Standard were easier to read: FKGL (6.2 vs. 9,  P < 0.001 ), GFI (8.8 vs. 10.7,  P = 0.04 ), FRE score (64.2 vs. 9,  P = 0.02 ). Mean DISCERN score was low: 40.3 ± 13.    Conclusions:  Overall, most websites were poor quality with reading levels too high for the target audience. Information Standard NHS quality mark was associated with improved readability, however along with HONcode were not found to have a statistically significant correlation with quality.  Based on this study, we would encourage healthcare professionals to be judicious in the websites they recommend to patients, and to consider both the readability and quality of the information provided.

Anaesthesia for total hip and knee replacement: A review of patient education materials available online