{"id":5140,"date":"2020-05-24T16:59:01","date_gmt":"2020-05-24T14:59:01","guid":{"rendered":"https:\/\/www.physiotutors.com\/?p=5140"},"modified":"2023-03-28T11:29:10","modified_gmt":"2023-03-28T09:29:10","slug":"7-crucial-facts-you-didnt-know-about-tendons","status":"publish","type":"post","link":"https:\/\/www.physiotutors.com\/7-crucial-facts-you-didnt-know-about-tendons\/","title":{"rendered":"7 crucial facts you didn\u2019t know about tendons"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">In this blog post, we are going to discuss 7 absolutely crucial facts about tendons that you probably didn\u2019t know, but that are very important to improve your tendinopathy rehab.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Let\u2019s jump right into it:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">1. The nociceptive driver of pain in tendons is unknown. Pathology seen on imaging is not the driver of pain. Vascularity is not the source of pain, merely a marker of tendon degeneration. On top of that, there are no sensory nerves deep in the tendon, but in the periphery around the tendon. Nerves that grow into a pathological tendon, are sympathetic nerves, not sensory. At last, central sensitization is probably less a problem in lower limb pathology compared to upper limb pathology (<a href=\"https:\/\/pubmed.ncbi.nlm.nih.gov\/26390275\/\" target=\"_blank\" rel=\"noreferrer noopener\">Plinsinga et al. 2015<\/a>,&nbsp;<a href=\"https:\/\/bjsm.bmj.com\/content\/52\/5\/284.short\" target=\"_blank\" rel=\"noreferrer noopener\">Plinsinga et al. 2018<\/a>).<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"750\" height=\"254\" src=\"https:\/\/www.physiotutors.com\/wp-content\/uploads\/2021\/08\/tendon-structure.jpg\" alt=\"Tendon structure\" class=\"wp-image-7490\"\/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">2. We are not able to repair\/heal degenerative tendon pathology. In other words, no surgery, no shockwave therapy, no injections whatsoever, and not even exercise are able to repair or heal a degenerated tendon.&nbsp;<a href=\"https:\/\/pubmed.ncbi.nlm.nih.gov\/31475937\/\" target=\"_blank\" rel=\"noreferrer noopener\">Docking et al. (2019)<\/a>&nbsp;reason that with little ability to sense tensile load, the cells in the degenerative part of the tendon may be under-stimulated and not receive the necessary mechanical stimuli to remodel, explaining the limited capacity of the pathological tendon to remodel and normalize. While you think that this might be bad news, the good news is: it\u2019s also not necessary. A study by&nbsp;<a href=\"https:\/\/pubmed.ncbi.nlm.nih.gov\/28169151\/\" target=\"_blank\" rel=\"noreferrer noopener\">Tsehaie et al. (2017)<\/a>&nbsp;showed that 24 weeks of eccentric exercises for the Achilles tendon did not produce changes outside the limits of detectable change in the tendon, but yet patients improved. They also found that o MRI parameter at baseline predicted the change in symptoms, so even if your MRI looks terrible, it doesn\u2019t matter.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"912\" height=\"573\" src=\"https:\/\/www.physiotutors.com\/wp-content\/uploads\/2021\/08\/Achilles-tendon-partial-rupture.jpg\" alt=\"Achilles tendon partial rupture\" class=\"wp-image-7492\"\/><figcaption class=\"wp-element-caption\">Figure from https:\/\/www.ultrasoundcases.info\/partial-ruptures-7335\/#gallery-2<\/figcaption><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\"><a href=\"https:\/\/www.physiotutors.com\/wp-content\/uploads\/2020\/05\/Achilles-tendon-partial-rupture.jpg\"><\/a>3. The tendon loading rate probably explains why tendinopathy is associated with repetitive stretch-shorten cycle (SSC) rather than heavy loads. The SSC occurs during any activity that requires the tendon to store and release energy like a spring. Everything else is easy for a tendon e.g. eccentric movements, high weight. The loading rate is calculated in BW\/sec. Here are two examples of the patellar and the Achilles tendon in different activities. So the highest loading rate for the patellar tendon is to land in a stop jump sequence, like in a basketball or volleyball, while leg pressing 3x bodyweight has a very low loading rate. <\/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\">Heavy slow resistance exercises are easy for a tendon. Stretch-shorten cycle exercises are hard for a tendon.<\/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 class=\"wp-block-paragraph\">This is the same for the Achilles tendon where calf raises have a very low loading rate for the tendon while running and hopping have a very high strain rate. Interestingly, the very best athletes who can run fast or jump high are the ones who are also at risk to develop tendon pathology the most, probably because they can load their tendons faster than anyone else. This phenomenon is also called the \u201cJumper\u2019s knee paradox\u201d, described in an article by\u00a0<a href=\"https:\/\/pubmed.ncbi.nlm.nih.gov\/23060653\/\" target=\"_blank\" rel=\"noreferrer noopener\">Visnes et al. (2013)<\/a>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Patellar tendon tensile load and loading rate in typical activities:<\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-full\"><img decoding=\"async\" width=\"611\" height=\"344\" src=\"https:\/\/www.physiotutors.com\/wp-content\/uploads\/2021\/08\/Patellar-tendon-load-and-loading-rate.jpg\" alt=\"Patellar tendon load and loading rate\" class=\"wp-image-7493\"\/><figcaption class=\"wp-element-caption\">Figure from a presentation of Jill Cook<\/figcaption><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\"><a href=\"https:\/\/www.physiotutors.com\/wp-content\/uploads\/2020\/05\/Patellar-tendon-load-and-loading-rate.jpg\"><\/a>Achilles tendon tensile load and loading rate in typical activities:<\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-full\"><img decoding=\"async\" width=\"588\" height=\"336\" src=\"https:\/\/www.physiotutors.com\/wp-content\/uploads\/2021\/08\/Achilles-tendon-load-and-loading-rate.jpg\" alt=\"Achilles tendon load and loading rate\" class=\"wp-image-7495\"\/><figcaption class=\"wp-element-caption\"> Figure from a presentation of Jill Cook <\/figcaption><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\"><a href=\"https:\/\/www.physiotutors.com\/wp-content\/uploads\/2020\/05\/Achilles-tendon-load-and-loading-rate.jpg\"><\/a>4. The Combination of compressive loads and tensile loads is more damaging to any of the two alone. A study by&nbsp;<a href=\"https:\/\/pubmed.ncbi.nlm.nih.gov\/12449766\/\" target=\"_blank\" rel=\"noreferrer noopener\">Soslowsky et al. (2002)<\/a>&nbsp;compared 3 groups of mice to each other: In 1 group they manipulated the acromial arch to simulate external compression, one group had higher tensile loads as they had to run on a treadmill more than other groups and a combined group. They found that extrinsic compression did not cause injury until overuse activity was introduced. While compressive properties may be important, tensile properties are more relevant properties in a tissue such as a tendon. The results show that the combination of external compression plus tensile loads led to the greatest injury.<\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-full\"><img decoding=\"async\" width=\"434\" height=\"347\" src=\"https:\/\/www.physiotutors.com\/wp-content\/uploads\/2021\/08\/soslowksy.jpg\" alt=\"Soslowksy\" class=\"wp-image-7498\"\/><figcaption class=\"wp-element-caption\"> Figure from Soslowksy et al. (2002): Injury created by overuse plus extrinsic compression is greater than the injuries created by overuse or extrinsic compression alone. Significant differences relative to control are indicated by a \u2018\u2018*\u2019\u2019 inside each bar (average +- standard deviation). Significant differences between single factors (E=Extrinsic, OV=Overload and multiple factors (OV\/E) are indicated by a \u2018\u2018*\u2019\u2019 above each pair of bars. <\/figcaption><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\"><a href=\"https:\/\/www.physiotutors.com\/wp-content\/uploads\/2020\/05\/soslowksy.jpg\"><\/a><\/p>\n\n\n\n<p class=\"wp-block-paragraph\" id=\"caption-attachment-68845\">5. Intense loading of tendons results in net collagen degradation for up to 36h. A study by&nbsp;<a href=\"https:\/\/pubmed.ncbi.nlm.nih.gov\/20308995\/\" target=\"_blank\" rel=\"noreferrer noopener\">Magnussen et al.(2010)<\/a>&nbsp;showed this effect in three groups of very intense exercise, which were 36km of running, 1 hour of repetitive kicking and 10 sets of 10 repetitions of knee extension at 70% maximal voluntary contraction. This means that we need sufficient recovery time to prevent tendinopathy and it\u2019s advisable to space out training sessions for the tendon to every other day or less.<\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-full\"><img decoding=\"async\" width=\"601\" height=\"324\" src=\"https:\/\/www.physiotutors.com\/wp-content\/uploads\/2021\/08\/Tendon-synthesis.jpg\" alt=\"Tendon synthesis\" class=\"wp-image-7499\"\/><figcaption class=\"wp-element-caption\"> Figure from Magnussen et al. (2010) <\/figcaption><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\" id=\"caption-attachment-68845\"><a href=\"https:\/\/www.physiotutors.com\/wp-content\/uploads\/2020\/05\/Tendon-synthesis.jpg\"><\/a>6. A pathological tendon has more good structure than a normal tendon (<a href=\"https:\/\/pubmed.ncbi.nlm.nih.gov\/26059532\/\" target=\"_blank\" rel=\"noreferrer noopener\">Docking et al. 2015<\/a>). This means we can load these tendons because we have loads of good tissue. Any therapies for tendon pathology are not necessary, because we cannot change the structure of the pathological part anyways. For this reason, Docking and colleagues came up with the quote \u201cTreat the donut, not the hole\u201d \u2013 in other words, focus on the healthy structure and not the pathological part.<\/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\">A pathological tendon has more good structure than a normal tendon (Docking et al. 2015)<\/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<figure class=\"wp-block-image aligncenter size-full\"><img decoding=\"async\" width=\"597\" height=\"252\" src=\"https:\/\/www.physiotutors.com\/wp-content\/uploads\/2021\/08\/CSA-good-and-poor-structure.jpg\" alt=\"Csa good and poor structure\" class=\"wp-image-7501\"\/><figcaption class=\"wp-element-caption\"> Figure from Docking &amp; Cook et al. (2015) <\/figcaption><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\" id=\"caption-attachment-68845\"><a href=\"https:\/\/www.physiotutors.com\/wp-content\/uploads\/2020\/05\/CSA-good-and-poor-structure.jpg\"><\/a>7. 66% of Achilles tendon ruptures are asymptomatic ruptures (<a href=\"https:\/\/pubmed.ncbi.nlm.nih.gov\/1748700\/\" target=\"_blank\" rel=\"noreferrer noopener\">Kannus et al. 1991<\/a>). This means these people never had Achilles tenderness, stiffness, pain, or dysfunction. However, there had to be some kind of pathology present in the tendon as the authors showed that 98% of ruptured tendons had degenerative pathology, while 2% had other pathology. Jill Cook explained this in a Twitter post stating that it\u2019s impossible to rupture a normal tendon in vivo without pathology.<\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-full\"><img decoding=\"async\" width=\"576\" height=\"227\" src=\"https:\/\/www.physiotutors.com\/wp-content\/uploads\/2021\/08\/Jill-Cook.jpg\" alt=\"Jill cook\" class=\"wp-image-7502\"\/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Interestingly, a study by\u00a0<a href=\"https:\/\/pubmed.ncbi.nlm.nih.gov\/28540301\/\" target=\"_blank\" rel=\"noreferrer noopener\">Yasui et al. (2017)<\/a>\u00a0showed that only 4% with Achilles tendinopathy go on to rupture the tendon. So pain in tendinopathy might actually be protective against a rupture and this is a very good and reassuring message for patients who are in tendon pain and afraid to rupture their tendons.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Alright, how many of those 7 were completely new to you?<br>As always, thanks a lot for reading!<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Kai<\/p>\n","protected":false},"excerpt":{"rendered":"","protected":false},"author":35,"featured_media":15753,"comment_status":"open","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":"","_relevanssi_noindex_reason":"","footnotes":""},"categories":[280],"tags":[284,292,293,283,254,285,291,294,295],"tracking_tag":[],"class_list":["post-5140","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-muscle-tendon","tag-achilles-tendinopathy","tag-achilles-tendon-rupture","tag-isometrics","tag-patellar-tendinopathy","tag-plantar-fasciitis","tag-tendinitis","tag-tendinosis","tag-tendon-facts","tag-tendon-risk-factors"],"acf":{"sections":[{"acf_fc_layout":"featured-related","heading":"Related 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