{"id":11940,"date":"2026-08-10T11:36:43","date_gmt":"2026-08-10T10:36:43","guid":{"rendered":"https:\/\/blogs.bmj.com\/bjsm\/?p=11940"},"modified":"2026-08-10T11:37:40","modified_gmt":"2026-08-10T10:37:40","slug":"ami-post-tka-why-arthrogenic-muscle-inhibition-should-be-a-primary-rehabilitation-target-following-knee-osteoarthritis-and-knee-replacement","status":"publish","type":"post","link":"https:\/\/blogs.bmj.com\/bjsm\/2026\/08\/10\/ami-post-tka-why-arthrogenic-muscle-inhibition-should-be-a-primary-rehabilitation-target-following-knee-osteoarthritis-and-knee-replacement\/","title":{"rendered":"AMI post TKA: Why arthrogenic muscle inhibition should be a primary rehabilitation target following knee osteoarthritis and knee replacement"},"content":{"rendered":"<p><i><span style=\"font-weight: 400\"><strong>Author<\/strong>: Dr. Georgios Kakavas, on behalf of the author team.<\/span><\/i><\/p>\n<p><span style=\"font-weight: 400\">Clinicians regularly encounter patients whose post-operative X-rays are unremarkable yet who have satisfactory postoperative results and improved range of motion. However, weeks or months later, these patients are unable to achieve full knee extension, experience difficulty activating the leg during stair ascent, and demonstrate persistent quadriceps weakness. In these patients, though the surgical procedure is successful, functional recovery is incomplete.<\/span><\/p>\n<p><span style=\"font-weight: 400\">This blog summarises our narrative review (Kakavas et al., 2026), which synthesized evidence from across the AMI literature, including randomized controlled trials, cohort studies, and mechanistic investigations, to identify the key underlying factor of this functional deficit and advocate for prioritizing arthrogenic muscle inhibition (AMI) as a primary rehabilitation target rather than a secondary concern.<\/span><\/p>\n<h4>What AMI is (and isn&#8217;t)<\/h4>\n<p><span style=\"font-weight: 400\">AMI is a reflexive inhibition of muscles around an injured, inflamed, swollen, or operated joint, most commonly affecting the quadriceps. It is not due to lack of effort, pain tolerance, or motivation, but to neurophysiological mechanisms: altered joint signaling changes spinal reflexes and motor cortex activity, limiting muscle mobilization even at maximal effort. <\/span><span style=\"font-weight: 400\">This distinction is critical; misattributing AMI to insufficient patient effort may lead to prescribing increased loading, which the underlying inhibition actively impedes.<\/span><\/p>\n<h4>Inhibition at every level: a multi-level problem<\/h4>\n<p><span style=\"font-weight: 400\">AMI can be conceptualized as a multi-level process, with inhibition occurring across three interconnected physiological levels; peripheral, spinal, and supraspinal. Each level contributes to the impaired voluntary muscle activation seen clinically:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400\"><b>Peripheral: <\/b><span style=\"font-weight: 400\">Even minimal joint effusion significantly impedes quadriceps activation. Consequently, swelling control should be regarded as a neurophysiological intervention in place of solely a comfort measure.<\/span><\/li>\n<li style=\"font-weight: 400\"><b>Spinal: <\/b><span style=\"font-weight: 400\">Presynaptic inhibition of Ia afferents, a disrupted gamma-loop, and reduced reflex gain blunt alpha-motoneuron excitability, keeping high-threshold motor units offline.<\/span><\/li>\n<li style=\"font-weight: 400\"><b>Supraspinal: <\/b><span style=\"font-weight: 400\">Changes in corticospinal excitability and intracortical inhibition appear to limit voluntary drive.<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400\">A considerable caveat in our review is that much of the evidence regarding cortical involvement is extrapolated from the anterior cruciate ligament (ACL) and broader neurorehabilitation literature rather than from arthroplasty-specific studies. Nevertheless, the practical implication remains: many patients present for surgery with pre-existing inhibition, which is additionally compounded by postoperative pain and effusion.<\/span><\/p>\n<h4>Why &#8220;standard rehab&#8221; can under-deliver<\/h4>\n<p><span style=\"font-weight: 400\">Our review found the interventions such as range-of-motion exercises, progressive strengthening, cycling, and basic functional drills constitute essential components of rehabilitation. However, the issues of specificity and timing are critical. During the initial postoperative weeks, when inhibition is <\/span><b>most pronounced<\/b><span style=\"font-weight: 400\">, generic strengthening exercises depend on a neurologically restricted system. Neglecting to address this window can result in an &#8216;activation debt,&#8217; resulting in persistent compensatory patterns and quadriceps deficits of 20\u201340% that may persist for months or even years.<\/span><\/p>\n<h4>A staged, mechanism-led rehabilitation framework<\/h4>\n<p><span style=\"font-weight: 400\">Our review reframes rehabilitation around the inhibition itself, corresponding to the intervention to the main mechanism at each stage:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400\"><b>Days 0\u20137 \u2014 break the effusion\u2013inhibition loop. <\/b><span style=\"font-weight: 400\">Cryotherapy, compression, elevation, early activation and exposure, and neuromuscular electrical stimulation (NMES) \u2014 a technique that uses electrical current to elicit involuntary muscle contractions \u2014 initiated as early as feasible to bypass voluntary activation failure.<\/span><\/li>\n<li style=\"font-weight: 400\"><b>Weeks 1\u20133 \u2014 restore voluntary drive. <\/b><span style=\"font-weight: 400\">Higher-intensity NMES (superimposed on contractions), EMG\/pressure biofeedback, terminal-extension quality work, and motor imagery\/action observation as a plausible cortical-priming adjunct (largely extrapolated from non-arthroplasty literature).<\/span><\/li>\n<li style=\"font-weight: 400\"><b>Weeks 2\u20138 \u2014 bridge with blood flow restriction training (BFRT). <\/b><span style=\"font-weight: 400\">BFRT uses a pressurized cuff to partially occlude venous return, enabling meaningful strength gains at low loads (20\u201330% of 1RM) when high-load exercises are not possible due to pain or AMI. Appropriate vascular screening and supervision are required.<\/span><\/li>\n<li style=\"font-weight: 400\"><b>Weeks 4\u201310 \u2014 sensorimotor retraining. <\/b><span style=\"font-weight: 400\">Balance, perturbation training, and dual-task work to rebuild reactive control and coordination \u2014 for example, single-leg stance on unstable surfaces, step-response drills, and walking with a concurrent cognitive task.<\/span><\/li>\n<li style=\"font-weight: 400\"><b>Weeks 8\u201316+ \u2014 high-level motor control. <\/b><span style=\"font-weight: 400\">Power, eccentric stair-descent capacity, gait symmetry with feedback, and task-specific demands to dismantle compensatory synergies.<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400\">Throughout all rehabilitation phases, it is important to educate patients that AMI is a neurophysiological issue rather than a matter of willpower, to reduce under-recruitment.<\/span><\/p>\n<h4>Effective treatment requires accurate measurement.<\/h4>\n<p><span style=\"font-weight: 400\">A major barrier identified in our review is the lack of routine measurement of voluntary activation. Most clinical trials report strength and functional outcomes yet do not quantify voluntary activation, causing difficulty in determining whether interventions address inhibition or merely compensate for it. We recommend reporting the central activation ratio (CAR) \u2014 a measure of the proportion of quadriceps motor units successfully recruited during a maximal voluntary contraction, typically assessed via twitch interpolation \u2014 alongside validated EMG-based metrics and functional outcomes. Phenotyping patients (identifying who has AMI, its severity, and pattern) would enable more targeted rehabilitation.<\/span><\/p>\n<h4>Take-home messages for clinicians<\/h4>\n<p><span style=\"font-weight: 400\">For physiotherapists and rehabilitation clinicians managing patients after knee osteoarthritis or knee arthroplasty, our review suggests the following key actions:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400\"><b>Treat effusion as a neurological problem <\/b><span style=\"font-weight: 400\">\u2014 control it aggressively and early.<\/span><\/li>\n<li style=\"font-weight: 400\"><b>Start NMES early<\/b><span style=\"font-weight: 400\">; don&#8217;t wait for &#8220;enough&#8221; voluntary activation.<\/span><\/li>\n<li style=\"font-weight: 400\"><b>Use BFRT as a bridge<\/b><span style=\"font-weight: 400\"> when high loads aren&#8217;t tolerated.<\/span><\/li>\n<li style=\"font-weight: 400\"><b>Go beyond strength<\/b><span style=\"font-weight: 400\">: retrain coordination, gait extension, and address cortical\/psychological layers.<\/span><\/li>\n<li style=\"font-weight: 400\"><b>Measure activation<\/b><span style=\"font-weight: 400\">, not just range and reps.<\/span><\/li>\n<li style=\"font-weight: 400\"><b>Consider AMI before surgery, too<\/b><span style=\"font-weight: 400\"> \u2014 prehabilitation may lower the baseline inhibition you start from post-operatively.<\/span><\/li>\n<\/ul>\n<h4>Conclusion<\/h4>\n<p><span style=\"font-weight: 400\">Implants do not facilitate motor unit recruitment; this depends on the patient&#8217;s nervous system. By reframing AMI as a primary, measurable target, clinicians can adopt a coherent, mechanism-based approach to improve strength, gait, and patient satisfaction following knee osteoarthritis and knee replacement. While the structural issue may be resolved, the focus must shift to restoring neuromuscular connectivity.<\/span><\/p>\n<p><b>Read the full review: <\/b><span style=\"font-weight: 400\">Kakavas G, Sasse C, Kr\u00f3likowska A, Wong S, Becker R, Prill R. Rehabilitation of Arthrogenic Muscle Inhibition in Patients with Knee Osteoarthritis and after Knee Arthroplasty. Curr Rev Musculoskelet Med. 2026;19:44. https:\/\/doi.org\/10.1007\/s12178-026-10038-7<\/span><\/p>\n<p><b>Competing interests: <\/b><span style=\"font-weight: 400\">None declared.<\/span><\/p>\n<p><b>Author: <\/b><i><span style=\"font-weight: 400\">Georgios Kakavas (Fysiotek Spine and Sports Lab, Athens; Queen Mary University of London, SEMS).<\/span><\/i><!--TrendMD v2.4.8--><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Author: Dr. Georgios Kakavas, on behalf of the author team. Clinicians regularly encounter patients whose post-operative X-rays are unremarkable yet who have satisfactory postoperative results and improved range of motion. However, weeks or months later, these patients are unable to achieve full knee extension, experience difficulty activating the leg during stair ascent, and demonstrate persistent [&#8230;]<\/p>\n<p><a class=\"btn btn-secondary understrap-read-more-link\" href=\"https:\/\/blogs.bmj.com\/bjsm\/2026\/08\/10\/ami-post-tka-why-arthrogenic-muscle-inhibition-should-be-a-primary-rehabilitation-target-following-knee-osteoarthritis-and-knee-replacement\/\">Read More&#8230;<\/a><\/p>\n","protected":false},"author":464,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[16399,16068,1399,1703,16462,16505],"class_list":["post-11940","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-ami","tag-featured","tag-injury","tag-knee","tag-rehab","tag-tka"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>AMI post TKA: Why arthrogenic muscle inhibition should be a primary rehabilitation target following knee osteoarthritis and knee replacement - BJSM blog - social media&#039;s leading SEM voice<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/blogs.bmj.com\/bjsm\/2026\/08\/10\/ami-post-tka-why-arthrogenic-muscle-inhibition-should-be-a-primary-rehabilitation-target-following-knee-osteoarthritis-and-knee-replacement\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"AMI post TKA: Why arthrogenic muscle inhibition should be a primary rehabilitation target following knee osteoarthritis and knee replacement - BJSM blog - social media&#039;s leading SEM voice\" \/>\n<meta property=\"og:description\" content=\"Author: Dr. Georgios Kakavas, on behalf of the author team. 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