{"id":17364,"date":"2023-10-09T11:57:14","date_gmt":"2023-10-09T09:57:14","guid":{"rendered":"https:\/\/www.physiotutors.com\/?p=17364"},"modified":"2023-10-09T11:58:37","modified_gmt":"2023-10-09T09:58:37","slug":"knee-crepitations-knee-crepitus-the-science-behind-why-knees-crack","status":"publish","type":"post","link":"https:\/\/www.physiotutors.com\/knee-crepitations-knee-crepitus-the-science-behind-why-knees-crack\/","title":{"rendered":"Knee Crepitations \/ Knee Crepitus &#8211; The Science Behind Why Knees Crack"},"content":{"rendered":"\n<p>A couple of years ago, we posted a video on social media that went absolutely viral: Why Knees Crack.<br>It&#8217;s time we turn this video into a blog post and update it here and there with evidence that came out in the last couple of years. If you haven&#8217;t seen our video yet, check it out below:<\/p>\n\n\n\n<figure class=\"wp-block-embed is-type-video is-provider-youtube wp-block-embed-youtube wp-embed-aspect-16-9 wp-has-aspect-ratio\"><div class=\"wp-block-embed__wrapper\">\n<iframe loading=\"lazy\" title=\"Knee cracking explained | Warning sign or normal phenomenon?\" width=\"500\" height=\"281\" src=\"https:\/\/www.youtube.com\/embed\/NQOZZgh5z8I?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe>\n<\/div><\/figure>\n\n\n\n<p>Knee crepitations can cause a lot of worry in our patients and might eventually lead to fear-avoiding behavior as negative health beliefs are associated with the crepitations (<a href=\"https:\/\/pubmed.ncbi.nlm.nih.gov\/28171780\/\">Robertso<\/a><a href=\"https:\/\/pubmed.ncbi.nlm.nih.gov\/28171780\/\" target=\"_blank\" rel=\"noreferrer noopener\">n<\/a><a href=\"https:\/\/pubmed.ncbi.nlm.nih.gov\/28171780\/\"> et al. 2017<\/a>). This can put patients in a downward spiral of altered abnormal motor behavior fueled by negative emotions. Evidence suggests that health professionals are often not assessing and managing these negative health beliefs. Given the prevalence of joint crepitus, this is relevant for any practitioner dealing with patients with musculoskeletal complaints. It&#8217;s time we put an end to this and start to reassure our patients that what they are experiencing is normal and even more important, explain to them what is happening.<\/p>\n\n\n<div class=\"quote-with-background\" style=\"\">\n    <div class=\"quote-with-background__in\">\n\n        <svg width=\"30px\" height=\"25px\" viewBox=\"0 0 30 25\" version=\"1.1\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\">\n            <g id=\"Design\" stroke=\"none\" stroke-width=\"1\" fill=\"none\" fill-rule=\"evenodd\">\n                <g id=\"08-blog-redesign\" transform=\"translate(-191.000000, -2974.000000)\" fill=\"#7973FF\" fill-rule=\"nonzero\">\n                    <g id=\"Group-7\" transform=\"translate(80.000000, 2893.000000)\">\n                        <g id=\"\u201c\" transform=\"translate(111.000000, 81.000000)\">\n                            <path d=\"M6.4,25 C4.42666667,25 2.86666667,24.3743344 1.72,23.1230032 C0.573333333,21.871672 0,20.2609159 0,18.2907348 C0,17.2790202 0.173333333,16.2539936 0.52,15.215655 C0.866666667,14.1773163 1.49333333,12.513312 2.4,10.2236422 L6.48,0 L12.8,0 L10,12.5399361 C11.9733333,14.0841321 12.96,16.001065 12.96,18.2907348 C12.96,20.2076677 12.3466667,21.8051118 11.12,23.0830671 C9.89333333,24.3610224 8.32,25 6.4,25 Z M23.44,25 C21.4666667,25 19.9066667,24.3743344 18.76,23.1230032 C17.6133333,21.871672 17.04,20.2609159 17.04,18.2907348 C17.04,17.2790202 17.2133333,16.2539936 17.56,15.215655 C17.9066667,14.1773163 18.5333333,12.513312 19.44,10.2236422 L23.52,0 L29.84,0 L27.04,12.5399361 C29.0133333,14.0841321 30,16.001065 30,18.2907348 C30,20.2076677 29.3866667,21.8051118 28.16,23.0830671 C26.9333333,24.3610224 25.36,25 23.44,25 Z\" id=\"Shape\"><\/path>\n                        <\/g>\n                    <\/g>\n                <\/g>\n            <\/g>\n        <\/svg>\n       <div class=\"quote-with-background__content heading-three\">\n            <p class=\"heading-four\">Inside the bone is rubbing because there is a noise, you could imagine it\u2019s the bone grinding on the bone &#8211; Patient&#8217;s belief from Robertson et al. (2017)<\/p>\n       <\/div>\n       <div class=\"quote-with-background__info\">\n                   <\/div>\n    <\/div>\n<!--    <div class=\"quote-with-background__background\">-->\n<!--        <svg width=\"100%\" height=\"100%\" viewBox=\"0 0 849 447\" version=\"1.1\" preserveAspectRatio=none xmlns=\"http:\/\/www.w3.org\/2000\/svg\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\">-->\n<!--            <g id=\"Design\" stroke=\"none\" stroke-width=\"1\" fill=\"none\" fill-rule=\"evenodd\">-->\n<!--                <g id=\"08-blog-redesign\" transform=\"translate(-80.000000, -2893.000000)\" fill=\"#F1F5FD\">-->\n<!--                    <g id=\"Group-7\" transform=\"translate(80.000000, 2893.000000)\">-->\n<!--                        <polygon id=\"Rectangle\" transform=\"translate(424.500000, 223.500000) scale(-1, 1) translate(-424.500000, -223.500000) \" points=\"0 99.703192 849 -4.43831367e-13 849 347.296808 0 447\"><\/polygon>-->\n<!--                    <\/g>-->\n<!--                <\/g>-->\n<!--            <\/g>-->\n<!--        <\/svg>-->\n<!--    <\/div>-->\n<\/div>\n\n\n\n<p>First of all, no research up to today has demonstrated a definitive link between crepitation noise and active pathology, and its importance and meaning to patients is under-researched. 99% of a cohort of subjects had joint crepitus, but no pain (<a href=\"https:\/\/boneandjoint.org.uk\/Article\/10.1302\/0301-620X.69B2.3818762\" target=\"_blank\" rel=\"noreferrer noopener\">McCoy et al. 1987<\/a>). If pain is concordant with the joint crepitations, contact a health professional to evaluate the situation. <br>After releasing our video back then, quite a few people reached out to us referring to the study of <a href=\"https:\/\/pubmed.ncbi.nlm.nih.gov\/28470832\/\" target=\"_blank\" rel=\"noreferrer noopener\">Lo et al. (2017)<\/a> who showed that &#8220;subjective knee crepitus predicts incident symptomatic OA longitudinally, with most cases occurring in those with preexisting tibiofemoral radiographic OA&#8221;. So how is this study different from the crepitus we are talking about in this blog article? The mean age in Lo&#8217;s study was 61.1 years and they were recruited from an OA initiative. This is very different from a 25-year-old with patellofemoral pain who does have creaky knees. More importantly, Lo also states that &#8220;in the group with pre-existing symptoms but no radiographic OA increased crepitus frequency was NOT predictive of OA over 4 years.&#8221;<br><br>An extra-articular mechanism may be tendon snapping over bony protuberances, which may be a palpable hollow snapping, sometimes inaudible, such as de Qu\u00e9rvain&#8217;s disease or tenosynovitis. <br>Inside the joint, a displacement of the two articular surfaces creates a vacuum and leads to the collapse of gas bubbles within the synovial fluid. What you hear is the characteristic pop (<a href=\"https:\/\/pubmed.ncbi.nlm.nih.gov\/12033758\/\" target=\"_blank\" rel=\"noreferrer noopener\">Protopapas et al. 2002<\/a>, <a href=\"https:\/\/pubmed.ncbi.nlm.nih.gov\/5557778\/\" target=\"_blank\" rel=\"noreferrer noopener\">Unsworth et al. 1971<\/a>). <\/p>\n\n\n<div class=\"quote-with-background\" style=\"\">\n    <div class=\"quote-with-background__in\">\n\n        <svg width=\"30px\" height=\"25px\" viewBox=\"0 0 30 25\" version=\"1.1\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\">\n            <g id=\"Design\" stroke=\"none\" stroke-width=\"1\" fill=\"none\" fill-rule=\"evenodd\">\n                <g id=\"08-blog-redesign\" transform=\"translate(-191.000000, -2974.000000)\" fill=\"#7973FF\" fill-rule=\"nonzero\">\n                    <g id=\"Group-7\" transform=\"translate(80.000000, 2893.000000)\">\n                        <g id=\"\u201c\" transform=\"translate(111.000000, 81.000000)\">\n                            <path d=\"M6.4,25 C4.42666667,25 2.86666667,24.3743344 1.72,23.1230032 C0.573333333,21.871672 0,20.2609159 0,18.2907348 C0,17.2790202 0.173333333,16.2539936 0.52,15.215655 C0.866666667,14.1773163 1.49333333,12.513312 2.4,10.2236422 L6.48,0 L12.8,0 L10,12.5399361 C11.9733333,14.0841321 12.96,16.001065 12.96,18.2907348 C12.96,20.2076677 12.3466667,21.8051118 11.12,23.0830671 C9.89333333,24.3610224 8.32,25 6.4,25 Z M23.44,25 C21.4666667,25 19.9066667,24.3743344 18.76,23.1230032 C17.6133333,21.871672 17.04,20.2609159 17.04,18.2907348 C17.04,17.2790202 17.2133333,16.2539936 17.56,15.215655 C17.9066667,14.1773163 18.5333333,12.513312 19.44,10.2236422 L23.52,0 L29.84,0 L27.04,12.5399361 C29.0133333,14.0841321 30,16.001065 30,18.2907348 C30,20.2076677 29.3866667,21.8051118 28.16,23.0830671 C26.9333333,24.3610224 25.36,25 23.44,25 Z\" id=\"Shape\"><\/path>\n                        <\/g>\n                    <\/g>\n                <\/g>\n            <\/g>\n        <\/svg>\n       <div class=\"quote-with-background__content heading-three\">\n            <p class=\"heading-four\">Popping = Gas bubbles<br \/>\nClunk = Patella on trochlea (ok)<br \/>\nFine grating = Movement of fluid through retropatellar surface (norm)<\/p>\n       <\/div>\n       <div class=\"quote-with-background__info\">\n                   <\/div>\n    <\/div>\n<!--    <div class=\"quote-with-background__background\">-->\n<!--        <svg width=\"100%\" height=\"100%\" viewBox=\"0 0 849 447\" version=\"1.1\" preserveAspectRatio=none xmlns=\"http:\/\/www.w3.org\/2000\/svg\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\">-->\n<!--            <g id=\"Design\" stroke=\"none\" stroke-width=\"1\" fill=\"none\" fill-rule=\"evenodd\">-->\n<!--                <g id=\"08-blog-redesign\" transform=\"translate(-80.000000, -2893.000000)\" fill=\"#F1F5FD\">-->\n<!--                    <g id=\"Group-7\" transform=\"translate(80.000000, 2893.000000)\">-->\n<!--                        <polygon id=\"Rectangle\" transform=\"translate(424.500000, 223.500000) scale(-1, 1) translate(-424.500000, -223.500000) \" points=\"0 99.703192 849 -4.43831367e-13 849 347.296808 0 447\"><\/polygon>-->\n<!--                    <\/g>-->\n<!--                <\/g>-->\n<!--            <\/g>-->\n<!--        <\/svg>-->\n<!--    <\/div>-->\n<\/div>\n\n\n\n<p><br>Interestingly enough, habitual knuckle cracking over the course of years showed no signs of osteoarthritis (<a href=\"https:\/\/www.ncbi.nlm.nih.gov\/pmc\/articles\/PMC1004074\/\" target=\"_blank\" rel=\"noreferrer noopener\">Castellanos et al. 2022<\/a>). The clunk can be explained as the slipstick phenomenon whereby the movement of the patella and femur are jerky and produce signals on vibration arthrography.<br>These vibrations are reduced in osteoarthritis and almost lost on advanced patellofemoral changes, most probably due to hypomobility and loss of joint lubrication. So, in short, degenerative joints are actually less likely to produce a crepitus. But what about the fine grating? That&#8217;s also normal as fluid flows through the slightly rough retropatellar surface.<\/p>\n\n\n<div class=\"cta\" style=\"\">\n    <div class=\"cta__in\">\n        <div class=\"left\">\n            <div class=\"cta__content text-color-light\">\n\t\t\t\t\t\t\t\t\t<h2 class=\"own-size\">Patellofemoral Pain &#038; Fat Pad Syndrome<\/h2>\n\t\t\t\t\t                <p>Update your Knowledge about Patellofemoral Pain by Gaining Insights into the Latest Research<\/p>\n                                        <div class=\"cta__button\">\n                                <a href=\"https:\/\/study.physiotutors.com\/course\/patellofemoral-pain-fat-pad-syndrome\/\" class=\"button button-five\" target=\"_self\">\n                                    Enroll Now                                <\/a>\n                            <\/div>\n                                    <\/div>\n        <\/div>\n                        <div class=\"right\">\n                    <img decoding=\"async\" src=\"https:\/\/www.physiotutors.com\/wp-content\/uploads\/2022\/06\/Patellofemoral-pain-mockup-full.png\" alt=\"\"\/>\n                <\/div>\n                <\/div>\n<\/div>\n\n\n\n<p><br>Did you know that the eland, a type of African antelope, uses knee crepitus to display dominance? (<a href=\"https:\/\/bmcbiol.biomedcentral.com\/articles\/10.1186\/1741-7007-6-47#auth-Jakob-Bro_J_rgensen-Aff1\" target=\"_blank\" rel=\"noreferrer noopener\">Bro-J\u00f8rgensen et al. 2008<\/a>) So maybe we should not see cracking knees as a sign of pathology, but as a positive sign because our joints are mobile and well-lubricated.<\/p>\n\n\n\n<p>Thanks a lot for reading!<\/p>\n\n\n\n<p>Kai<\/p>\n\n\n\n<p><\/p>\n\n\n\n<h2 class=\"wp-block-heading\">References<\/h2>\n\n\n\n<p><a href=\"https:\/\/bmcbiol.biomedcentral.com\/articles\/10.1186\/1741-7007-6-47\">Bro-J\u00f8rgensen, J., &amp; Dabelsteen, T. (2008). Knee-clicks and visual traits indicate fighting ability in eland antelopes: multiple messages and back-up signals.&nbsp;<em>BMC biology<\/em>,&nbsp;<em>6<\/em>, 1-8.<\/a><a href=\"https:\/\/bmcbiol.biomedcentral.com\/articles\/10.1186\/1741-7007-6-47\" target=\"_blank\" rel=\"noreferrer noopener\">https:\/\/bmcbiol.biomedcentral.com\/articles\/10.1186\/1741-7007-6-47<\/a><\/p>\n\n\n\n<p><a href=\"https:\/\/www.ncbi.nlm.nih.gov\/pmc\/articles\/PMC1004074\/\" target=\"_blank\" rel=\"noreferrer noopener\">Castellanos, J., &amp; Axelrod, D. (1990). Effect of habitual knuckle cracking on hand function.&nbsp;<em>Annals of the Rheumatic Diseases<\/em>,&nbsp;<em>49<\/em>(5), 308-309.<\/a><\/p>\n\n\n\n<p><a href=\"https:\/\/pubmed.ncbi.nlm.nih.gov\/28470832\/\" target=\"_blank\" rel=\"noreferrer noopener\">Lo, G. H., Strayhorn, M. T., Driban, J. B., Price, L. L., Eaton, C. B., &amp; Mcalindon, T. E. (2018). Subjective Crepitus as a risk factor for incident symptomatic knee osteoarthritis: data from the osteoarthritis initiative.&nbsp;<em>Arthritis care &amp; research<\/em>,&nbsp;<em>70<\/em>(1), 53-60.<\/a><\/p>\n\n\n\n<p><a href=\"https:\/\/boneandjoint.org.uk\/Article\/10.1302\/0301-620X.69B2.3818762\" target=\"_blank\" rel=\"noreferrer noopener\">McCoy, G. F., McCrea, J. D., Beverland, D. E., Kernohan, W. G., &amp; Mollan, R. A. (1987). Vibration arthrography as a diagnostic aid in diseases of the knee. A preliminary report.&nbsp;<em>The Journal of Bone &amp; Joint Surgery British Volume<\/em>,&nbsp;<em>69<\/em>(2), 288-293.<\/a><\/p>\n\n\n\n<p><a href=\"https:\/\/pubmed.ncbi.nlm.nih.gov\/28171780\/\">Robertson, C. J., Hurley, M., &amp; Jones, F. (2017). People&#8217;s beliefs about the meaning of crepitus in patellofemoral pain and the impact of these beliefs on their behaviour: a qualitative study.&nbsp;<em>Musculoskeletal Science and Practice<\/em>,&nbsp;<em>28<\/em>, 59-64.<\/a><a href=\"https:\/\/pubmed.ncbi.nlm.nih.gov\/28171780\/\" target=\"_blank\" rel=\"noreferrer noopener\">https:\/\/pubmed.ncbi.nlm.nih.gov\/28171780\/<\/a><\/p>\n\n\n\n<p><a href=\"https:\/\/pubmed.ncbi.nlm.nih.gov\/21031637\/\" target=\"_blank\" rel=\"noreferrer noopener\">Robertson, C. J. (2010). Joint crepitus\u2014are we failing our patients?.&nbsp;<em>Physiotherapy Research International<\/em>,&nbsp;<em>15<\/em>(4), 185-188.<\/a><\/p>\n\n\n\n<p><a href=\"https:\/\/pubmed.ncbi.nlm.nih.gov\/12033758\/\" target=\"_blank\" rel=\"noreferrer noopener\">Protopapas, M. G., &amp; Cymet, T. C. (2002). Joint cracking and popping: understanding noises that accompany articular release.&nbsp;<em>Journal of Osteopathic Medicine<\/em>,&nbsp;<em>102<\/em>(5), 283-287.<\/a><\/p>\n\n\n\n<p><a href=\"https:\/\/pubmed.ncbi.nlm.nih.gov\/5557778\/\" target=\"_blank\" rel=\"noreferrer noopener\">Unsworth, A., Dowson, D., &amp; Wright, V. (1971). &#8216;Cracking joints&#8217;. A bioengineering study of cavitation in the metacarpophalangeal joint.&nbsp;<em>Annals of the rheumatic diseases<\/em>,&nbsp;<em>30<\/em>(4), 348.<\/a><\/p>\n\n\n\n<p><\/p>\n","protected":false},"excerpt":{"rendered":"","protected":false},"author":35,"featured_media":17367,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_relevanssi_hide_post":"","_relevanssi_hide_content":"","_relevanssi_pin_for_all":"","_relevanssi_pin_keywords":"","_relevanssi_unpin_keywords":"","_relevanssi_related_keywords":"","_relevanssi_related_include_ids":"","_relevanssi_related_exclude_ids":"","_relevanssi_related_no_append":"","_relevanssi_related_not_related":"","_relevanssi_related_posts":"11616,5174,16504,10513,13784,8188","_relevanssi_noindex_reason":"","footnotes":""},"categories":[187],"tags":[2167,2166,2165,202,2170,1885,1911],"tracking_tag":[],"class_list":["post-17364","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-knee","tag-cracking-knees","tag-knee-cracking","tag-knee-crepitus","tag-knee-pain","tag-patellofemoral-arthritis","tag-patellofemoral-pain","tag-pfps"],"acf":{"sections":[{"acf_fc_layout":"featured-related","heading":"Related blog articles","subheading":"","content_editor":"","featured_or_related":"related","posts":null,"button_type":"internal_link","button_label":"","button_style":"button-one","button_internal_link":"","button_anchor":"","button_url":"","button_file":null}]},"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.6 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Knee Crepitations \/ Knee Crepitus | The Science Why Knees Crack<\/title>\n<meta name=\"description\" content=\"Read this blog article to learn why knee crack and where we shine a light on the science behind knee crepitations.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.physiotutors.com\/knee-crepitations-knee-crepitus-the-science-behind-why-knees-crack\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Knee Crepitations \/ Knee Crepitus | The Science Why Knees Crack\" \/>\n<meta property=\"og:description\" content=\"Read this blog article to learn why knee crack and where we shine a light on the science behind knee crepitations.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.physiotutors.com\/knee-crepitations-knee-crepitus-the-science-behind-why-knees-crack\/\" \/>\n<meta property=\"og:site_name\" content=\"Physiotutors\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/facebook.com\/physiotutors\" \/>\n<meta property=\"article:published_time\" content=\"2023-10-09T09:57:14+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2023-10-09T09:58:37+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.physiotutors.com\/wp-content\/uploads\/2023\/10\/Knee-Crepitus_Featured-image.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"1280\" \/>\n\t<meta property=\"og:image:height\" content=\"720\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"Kai Sigel\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@physiotutors\" \/>\n<meta name=\"twitter:site\" content=\"@physiotutors\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/www.physiotutors.com\\\/knee-crepitations-knee-crepitus-the-science-behind-why-knees-crack\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.physiotutors.com\\\/knee-crepitations-knee-crepitus-the-science-behind-why-knees-crack\\\/\"},\"author\":{\"name\":\"Kai Sigel\",\"@id\":\"https:\\\/\\\/www.physiotutors.com\\\/#\\\/schema\\\/person\\\/f03513d873af24df0757deed5bb34a1c\"},\"headline\":\"Knee Crepitations \\\/ Knee Crepitus &#8211; The Science Behind Why Knees Crack\",\"datePublished\":\"2023-10-09T09:57:14+00:00\",\"dateModified\":\"2023-10-09T09:58:37+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/www.physiotutors.com\\\/knee-crepitations-knee-crepitus-the-science-behind-why-knees-crack\\\/\"},\"wordCount\":834,\"publisher\":{\"@id\":\"https:\\\/\\\/www.physiotutors.com\\\/#organization\"},\"image\":{\"@id\":\"https:\\\/\\\/www.physiotutors.com\\\/knee-crepitations-knee-crepitus-the-science-behind-why-knees-crack\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/www.physiotutors.com\\\/wp-content\\\/uploads\\\/2023\\\/10\\\/Knee-Crepitus_Featured-image.jpg\",\"keywords\":[\"cracking knees\",\"knee cracking\",\"knee crepitus\",\"knee pain\",\"patellofemoral arthritis\",\"patellofemoral pain\",\"PFPS\"],\"articleSection\":[\"Knee\"],\"inLanguage\":\"en-US\"},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/www.physiotutors.com\\\/knee-crepitations-knee-crepitus-the-science-behind-why-knees-crack\\\/\",\"url\":\"https:\\\/\\\/www.physiotutors.com\\\/knee-crepitations-knee-crepitus-the-science-behind-why-knees-crack\\\/\",\"name\":\"Knee Crepitations \\\/ Knee Crepitus | The Science Why Knees Crack\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.physiotutors.com\\\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\\\/\\\/www.physiotutors.com\\\/knee-crepitations-knee-crepitus-the-science-behind-why-knees-crack\\\/#primaryimage\"},\"image\":{\"@id\":\"https:\\\/\\\/www.physiotutors.com\\\/knee-crepitations-knee-crepitus-the-science-behind-why-knees-crack\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/www.physiotutors.com\\\/wp-content\\\/uploads\\\/2023\\\/10\\\/Knee-Crepitus_Featured-image.jpg\",\"datePublished\":\"2023-10-09T09:57:14+00:00\",\"dateModified\":\"2023-10-09T09:58:37+00:00\",\"description\":\"Read this blog article to learn why knee crack and where we shine a light on the science behind knee crepitations.\",\"breadcrumb\":{\"@id\":\"https:\\\/\\\/www.physiotutors.com\\\/knee-crepitations-knee-crepitus-the-science-behind-why-knees-crack\\\/#breadcrumb\"},\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\\\/\\\/www.physiotutors.com\\\/knee-crepitations-knee-crepitus-the-science-behind-why-knees-crack\\\/\"]}]},{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\\\/\\\/www.physiotutors.com\\\/knee-crepitations-knee-crepitus-the-science-behind-why-knees-crack\\\/#primaryimage\",\"url\":\"https:\\\/\\\/www.physiotutors.com\\\/wp-content\\\/uploads\\\/2023\\\/10\\\/Knee-Crepitus_Featured-image.jpg\",\"contentUrl\":\"https:\\\/\\\/www.physiotutors.com\\\/wp-content\\\/uploads\\\/2023\\\/10\\\/Knee-Crepitus_Featured-image.jpg\",\"width\":1280,\"height\":720,\"caption\":\"Knee crepitations\"},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\\\/\\\/www.physiotutors.com\\\/knee-crepitations-knee-crepitus-the-science-behind-why-knees-crack\\\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\\\/\\\/www.physiotutors.com\\\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Knee Crepitations \\\/ Knee Crepitus &#8211; The Science Behind Why Knees Crack\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\\\/\\\/www.physiotutors.com\\\/#website\",\"url\":\"https:\\\/\\\/www.physiotutors.com\\\/\",\"name\":\"Physiotutors\",\"description\":\"\",\"publisher\":{\"@id\":\"https:\\\/\\\/www.physiotutors.com\\\/#organization\"},\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\\\/\\\/www.physiotutors.com\\\/?s={search_term_string}\"},\"query-input\":{\"@type\":\"PropertyValueSpecification\",\"valueRequired\":true,\"valueName\":\"search_term_string\"}}],\"inLanguage\":\"en-US\"},{\"@type\":\"Organization\",\"@id\":\"https:\\\/\\\/www.physiotutors.com\\\/#organization\",\"name\":\"Physiotutors\",\"url\":\"https:\\\/\\\/www.physiotutors.com\\\/\",\"logo\":{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\\\/\\\/www.physiotutors.com\\\/#\\\/schema\\\/logo\\\/image\\\/\",\"url\":\"https:\\\/\\\/www.physiotutors.com\\\/wp-content\\\/uploads\\\/2021\\\/06\\\/PHY_Logo-Purple-2.svg\",\"contentUrl\":\"https:\\\/\\\/www.physiotutors.com\\\/wp-content\\\/uploads\\\/2021\\\/06\\\/PHY_Logo-Purple-2.svg\",\"width\":315,\"height\":65,\"caption\":\"Physiotutors\"},\"image\":{\"@id\":\"https:\\\/\\\/www.physiotutors.com\\\/#\\\/schema\\\/logo\\\/image\\\/\"},\"sameAs\":[\"https:\\\/\\\/facebook.com\\\/physiotutors\",\"https:\\\/\\\/x.com\\\/physiotutors\",\"https:\\\/\\\/instagram.com\\\/physiotutors\",\"https:\\\/\\\/youtube.com\\\/physiotutors\"]},{\"@type\":\"Person\",\"@id\":\"https:\\\/\\\/www.physiotutors.com\\\/#\\\/schema\\\/person\\\/f03513d873af24df0757deed5bb34a1c\",\"name\":\"Kai Sigel\"}]}<\/script>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"Knee Crepitations \/ Knee Crepitus | The Science Why Knees Crack","description":"Read this blog article to learn why knee crack and where we shine a light on the science behind knee crepitations.","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/www.physiotutors.com\/knee-crepitations-knee-crepitus-the-science-behind-why-knees-crack\/","og_locale":"en_US","og_type":"article","og_title":"Knee Crepitations \/ Knee Crepitus | The Science Why Knees Crack","og_description":"Read this blog article to learn why knee crack and where we shine a light on the science behind knee crepitations.","og_url":"https:\/\/www.physiotutors.com\/knee-crepitations-knee-crepitus-the-science-behind-why-knees-crack\/","og_site_name":"Physiotutors","article_publisher":"https:\/\/facebook.com\/physiotutors","article_published_time":"2023-10-09T09:57:14+00:00","article_modified_time":"2023-10-09T09:58:37+00:00","og_image":[{"width":1280,"height":720,"url":"https:\/\/www.physiotutors.com\/wp-content\/uploads\/2023\/10\/Knee-Crepitus_Featured-image.jpg","type":"image\/jpeg"}],"author":"Kai Sigel","twitter_card":"summary_large_image","twitter_creator":"@physiotutors","twitter_site":"@physiotutors","schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"Article","@id":"https:\/\/www.physiotutors.com\/knee-crepitations-knee-crepitus-the-science-behind-why-knees-crack\/#article","isPartOf":{"@id":"https:\/\/www.physiotutors.com\/knee-crepitations-knee-crepitus-the-science-behind-why-knees-crack\/"},"author":{"name":"Kai Sigel","@id":"https:\/\/www.physiotutors.com\/#\/schema\/person\/f03513d873af24df0757deed5bb34a1c"},"headline":"Knee Crepitations \/ Knee Crepitus &#8211; The Science Behind Why Knees Crack","datePublished":"2023-10-09T09:57:14+00:00","dateModified":"2023-10-09T09:58:37+00:00","mainEntityOfPage":{"@id":"https:\/\/www.physiotutors.com\/knee-crepitations-knee-crepitus-the-science-behind-why-knees-crack\/"},"wordCount":834,"publisher":{"@id":"https:\/\/www.physiotutors.com\/#organization"},"image":{"@id":"https:\/\/www.physiotutors.com\/knee-crepitations-knee-crepitus-the-science-behind-why-knees-crack\/#primaryimage"},"thumbnailUrl":"https:\/\/www.physiotutors.com\/wp-content\/uploads\/2023\/10\/Knee-Crepitus_Featured-image.jpg","keywords":["cracking knees","knee cracking","knee crepitus","knee pain","patellofemoral arthritis","patellofemoral pain","PFPS"],"articleSection":["Knee"],"inLanguage":"en-US"},{"@type":"WebPage","@id":"https:\/\/www.physiotutors.com\/knee-crepitations-knee-crepitus-the-science-behind-why-knees-crack\/","url":"https:\/\/www.physiotutors.com\/knee-crepitations-knee-crepitus-the-science-behind-why-knees-crack\/","name":"Knee Crepitations \/ Knee Crepitus | The Science Why Knees Crack","isPartOf":{"@id":"https:\/\/www.physiotutors.com\/#website"},"primaryImageOfPage":{"@id":"https:\/\/www.physiotutors.com\/knee-crepitations-knee-crepitus-the-science-behind-why-knees-crack\/#primaryimage"},"image":{"@id":"https:\/\/www.physiotutors.com\/knee-crepitations-knee-crepitus-the-science-behind-why-knees-crack\/#primaryimage"},"thumbnailUrl":"https:\/\/www.physiotutors.com\/wp-content\/uploads\/2023\/10\/Knee-Crepitus_Featured-image.jpg","datePublished":"2023-10-09T09:57:14+00:00","dateModified":"2023-10-09T09:58:37+00:00","description":"Read this blog article to learn why knee crack and where we shine a light on the science behind knee crepitations.","breadcrumb":{"@id":"https:\/\/www.physiotutors.com\/knee-crepitations-knee-crepitus-the-science-behind-why-knees-crack\/#breadcrumb"},"inLanguage":"en-US","potentialAction":[{"@type":"ReadAction","target":["https:\/\/www.physiotutors.com\/knee-crepitations-knee-crepitus-the-science-behind-why-knees-crack\/"]}]},{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/www.physiotutors.com\/knee-crepitations-knee-crepitus-the-science-behind-why-knees-crack\/#primaryimage","url":"https:\/\/www.physiotutors.com\/wp-content\/uploads\/2023\/10\/Knee-Crepitus_Featured-image.jpg","contentUrl":"https:\/\/www.physiotutors.com\/wp-content\/uploads\/2023\/10\/Knee-Crepitus_Featured-image.jpg","width":1280,"height":720,"caption":"Knee crepitations"},{"@type":"BreadcrumbList","@id":"https:\/\/www.physiotutors.com\/knee-crepitations-knee-crepitus-the-science-behind-why-knees-crack\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https:\/\/www.physiotutors.com\/"},{"@type":"ListItem","position":2,"name":"Knee Crepitations \/ Knee Crepitus &#8211; The Science Behind Why Knees Crack"}]},{"@type":"WebSite","@id":"https:\/\/www.physiotutors.com\/#website","url":"https:\/\/www.physiotutors.com\/","name":"Physiotutors","description":"","publisher":{"@id":"https:\/\/www.physiotutors.com\/#organization"},"potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/www.physiotutors.com\/?s={search_term_string}"},"query-input":{"@type":"PropertyValueSpecification","valueRequired":true,"valueName":"search_term_string"}}],"inLanguage":"en-US"},{"@type":"Organization","@id":"https:\/\/www.physiotutors.com\/#organization","name":"Physiotutors","url":"https:\/\/www.physiotutors.com\/","logo":{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/www.physiotutors.com\/#\/schema\/logo\/image\/","url":"https:\/\/www.physiotutors.com\/wp-content\/uploads\/2021\/06\/PHY_Logo-Purple-2.svg","contentUrl":"https:\/\/www.physiotutors.com\/wp-content\/uploads\/2021\/06\/PHY_Logo-Purple-2.svg","width":315,"height":65,"caption":"Physiotutors"},"image":{"@id":"https:\/\/www.physiotutors.com\/#\/schema\/logo\/image\/"},"sameAs":["https:\/\/facebook.com\/physiotutors","https:\/\/x.com\/physiotutors","https:\/\/instagram.com\/physiotutors","https:\/\/youtube.com\/physiotutors"]},{"@type":"Person","@id":"https:\/\/www.physiotutors.com\/#\/schema\/person\/f03513d873af24df0757deed5bb34a1c","name":"Kai Sigel"}]}},"_links":{"self":[{"href":"https:\/\/www.physiotutors.com\/wp-json\/wp\/v2\/posts\/17364","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.physiotutors.com\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.physiotutors.com\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.physiotutors.com\/wp-json\/wp\/v2\/users\/35"}],"replies":[{"embeddable":true,"href":"https:\/\/www.physiotutors.com\/wp-json\/wp\/v2\/comments?post=17364"}],"version-history":[{"count":1,"href":"https:\/\/www.physiotutors.com\/wp-json\/wp\/v2\/posts\/17364\/revisions"}],"predecessor-version":[{"id":17371,"href":"https:\/\/www.physiotutors.com\/wp-json\/wp\/v2\/posts\/17364\/revisions\/17371"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.physiotutors.com\/wp-json\/wp\/v2\/media\/17367"}],"wp:attachment":[{"href":"https:\/\/www.physiotutors.com\/wp-json\/wp\/v2\/media?parent=17364"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.physiotutors.com\/wp-json\/wp\/v2\/categories?post=17364"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.physiotutors.com\/wp-json\/wp\/v2\/tags?post=17364"},{"taxonomy":"tracking_tag","embeddable":true,"href":"https:\/\/www.physiotutors.com\/wp-json\/wp\/v2\/tracking_tag?post=17364"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}