{"id":16210,"date":"2022-08-15T00:00:00","date_gmt":"2022-08-14T22:00:00","guid":{"rendered":"https:\/\/c01.purpledshub.com\/bbcsciencefocus\/?post_type=purple_issue&p=16210"},"modified":"2022-08-22T11:39:38","modified_gmt":"2022-08-22T09:39:38","slug":"why-does-a-cornea-heal-and-cartilage-wears-out-when-neither-has-a-blood-supply","status":"publish","type":"post","link":"https:\/\/c01.purpledshub.com\/bbcsciencefocus\/2022\/08\/15\/why-does-a-cornea-heal-and-cartilage-wears-out-when-neither-has-a-blood-supply\/","title":{"rendered":"Why does a cornea heal and cartilage wears out, when neither has a blood supply?"},"content":{"rendered":"\n

Why does a cornea heal and cartilage wears out, when neither has a blood supply?<\/h3>\n\n

MARK R SLACK, VIA EMAIL<\/p>\n\n

\"\"<\/figure><\/div>\n\n

The outer layer of the cornea is called the epithelium. It is made up of cells that are constantly turned over, as the outermost cells are shed into the tear film. Corneal abrasions usually affect this layer. The entire epithelium is turned over in approximately 7-10 days, and this process is accelerated during wound healing. <\/p>\n\n

Historically, cartilage was thought to \u2018wear and tear\u2019 as we age, leading to osteoarthritis. But we now know that it\u2019s a disease of the entire joint, including bone, cartilage, ligaments, fat and the tissues lining the joint. Beyond simple wear and tear, osteoarthritis can cause cartilage to degrade, change bone shape and cause inflammation \u2013 all of which are difficult to reverse. NM <\/strong><\/em><\/p>\n\n

<\/div>
\n

Email your questions to<\/span>
questions@sciencefocus.com<\/a>
or submit on Twitter<\/span>
@sciencefocus<\/a><\/p>\n<\/div><\/section>\n\n

IMAGE: GETTY IMAGES<\/p>\n","protected":false},"excerpt":{"rendered":"

Why does a cornea heal and cartilage wears out, when neither has a blood supply? MARK R SLACK, VIA EMAIL The outer layer of the cornea is called the epithelium. It is made up of cells that are constantly turned over, as the outermost cells are shed into the tear film. Corneal abrasions usually affect […]<\/p>\n","protected":false},"author":24,"featured_media":16209,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"ub_ctt_via":"","purple_page_number":"81","purple_custom_meta_purple_page_number":"81","purple_seq_number":"1","purple_custom_meta_purple_seq_number":"1","purple_source_article":"article_81-1.xml","purple_custom_meta_purple_source_article":"article_81-1.xml","purple_source_issue":"August-2022","purple_custom_meta_purple_source_issue":"August-2022","purple_external_id":"August-2022-81-1","purple_custom_meta_purple_external_id":"August-2022-81-1","purple_issue_code":"|0000089657||","purple_custom_meta_purple_issue_code":"|0000089657||","purple_android_product":"com.focus.magazine.issue381","purple_custom_meta_purple_android_product":"com.focus.magazine.issue381","purple_ios_product":"com.focus.magazine.issue381","purple_custom_meta_purple_ios_product":"com.focus.magazine.issue381","purple_web_product":"","purple_custom_meta_purple_web_product":"","purple_publication_id":"0f422ad1-c939-476d-9f82-a410052ad4c3","purple_migrated":"","kt_blocks_editor_width":"","apple_news_api_created_at":"2022-08-15T15:41:49Z","apple_news_article-theme":"","apple_news_api_id":"c9ea6860-e076-4308-a3ab-dbfb13137798","apple_news_api_modified_at":"2022-08-22T09:39:43Z","apple_news_api_revision":"AAAAAAAAAAAAAAAAAAAACA==","apple_news_api_share_url":"https:\/\/apple.news\/AyepoYOB2Qwijq9v7ExN3mA","apple_news_coverimage":0,"apple_news_coverimage_caption":"","apple_news_is_hidden":false,"apple_news_is_paid":true,"apple_news_is_preview":true,"apple_news_is_sponsored":false,"apple_news_maturity_rating":"","apple_news_pullquote":"","apple_news_pullquote_position":"","apple_news_article_theme":"","apple_news_sections":"[]"},"categories":[30],"tags":[15],"apple_news_notices":[],"featured_image_src":"https:\/\/c01.purpledshub.com\/uploads\/sites\/42\/2022\/08\/2c9d94d4-2aec-4d1e-8795-2bf260c66eca.jpg","author_info":{"display_name":"importmanagerhub@sprylab.com","author_link":"https:\/\/c01.purpledshub.com\/bbcsciencefocus\/author\/importmanagerhubsprylab-com\/"},"acf":{"readingTimeMinutes":"< 1","apple_news_title":""},"uagb_featured_image_src":{"full":["https:\/\/c01.purpledshub.com\/uploads\/sites\/42\/2022\/08\/2c9d94d4-2aec-4d1e-8795-2bf260c66eca.jpg",958,790,false],"thumbnail":["https:\/\/c01.purpledshub.com\/uploads\/sites\/42\/2022\/08\/2c9d94d4-2aec-4d1e-8795-2bf260c66eca-150x150.jpg",150,150,true],"medium":["https:\/\/c01.purpledshub.com\/uploads\/sites\/42\/2022\/08\/2c9d94d4-2aec-4d1e-8795-2bf260c66eca-300x247.jpg",300,247,true],"medium_large":["https:\/\/c01.purpledshub.com\/uploads\/sites\/42\/2022\/08\/2c9d94d4-2aec-4d1e-8795-2bf260c66eca-768x633.jpg",768,633,true],"large":["https:\/\/c01.purpledshub.com\/uploads\/sites\/42\/2022\/08\/2c9d94d4-2aec-4d1e-8795-2bf260c66eca.jpg",800,660,false],"1536x1536":["https:\/\/c01.purpledshub.com\/uploads\/sites\/42\/2022\/08\/2c9d94d4-2aec-4d1e-8795-2bf260c66eca.jpg",958,790,false],"2048x2048":["https:\/\/c01.purpledshub.com\/uploads\/sites\/42\/2022\/08\/2c9d94d4-2aec-4d1e-8795-2bf260c66eca.jpg",958,790,false]},"uagb_author_info":{"display_name":"importmanagerhub@sprylab.com","author_link":"https:\/\/c01.purpledshub.com\/bbcsciencefocus\/author\/importmanagerhubsprylab-com\/"},"uagb_comment_info":0,"uagb_excerpt":"Why does a cornea heal and cartilage wears out, when neither has a blood supply? MARK R SLACK, VIA EMAIL The outer layer of the cornea is called the epithelium. It is made up of cells that are constantly turned over, as the outermost cells are shed into the tear film. Corneal abrasions usually affect…","_links":{"self":[{"href":"https:\/\/c01.purpledshub.com\/bbcsciencefocus\/wp-json\/wp\/v2\/posts\/16210"}],"collection":[{"href":"https:\/\/c01.purpledshub.com\/bbcsciencefocus\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/c01.purpledshub.com\/bbcsciencefocus\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/c01.purpledshub.com\/bbcsciencefocus\/wp-json\/wp\/v2\/users\/24"}],"replies":[{"embeddable":true,"href":"https:\/\/c01.purpledshub.com\/bbcsciencefocus\/wp-json\/wp\/v2\/comments?post=16210"}],"version-history":[{"count":9,"href":"https:\/\/c01.purpledshub.com\/bbcsciencefocus\/wp-json\/wp\/v2\/posts\/16210\/revisions"}],"predecessor-version":[{"id":16904,"href":"https:\/\/c01.purpledshub.com\/bbcsciencefocus\/wp-json\/wp\/v2\/posts\/16210\/revisions\/16904"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/c01.purpledshub.com\/bbcsciencefocus\/wp-json\/wp\/v2\/media\/16209"}],"wp:attachment":[{"href":"https:\/\/c01.purpledshub.com\/bbcsciencefocus\/wp-json\/wp\/v2\/media?parent=16210"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/c01.purpledshub.com\/bbcsciencefocus\/wp-json\/wp\/v2\/categories?post=16210"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/c01.purpledshub.com\/bbcsciencefocus\/wp-json\/wp\/v2\/tags?post=16210"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}