{"id":3082,"date":"2026-02-27T23:02:33","date_gmt":"2026-02-27T23:02:33","guid":{"rendered":"https:\/\/www.bestspinehospitals.com\/blog\/cli-definition-uses-and-clinical-overview\/"},"modified":"2026-02-27T23:02:33","modified_gmt":"2026-02-27T23:02:33","slug":"cli-definition-uses-and-clinical-overview","status":"publish","type":"post","link":"https:\/\/www.bestspinehospitals.com\/blog\/cli-definition-uses-and-clinical-overview\/","title":{"rendered":"CLI: Definition, Uses, and Clinical Overview"},"content":{"rendered":"\n<h2 class=\"wp-block-heading\">CLI Introduction (What it is)<\/h2>\n\n\n\n<p>CLI most commonly refers to <strong>critical limb ischemia<\/strong>, a severe form of <strong>peripheral artery disease (PAD)<\/strong>.<br\/>\nIt describes <strong>chronic, markedly reduced blood flow<\/strong> to a leg or foot that can cause <strong>rest pain, non-healing wounds, or tissue loss<\/strong>.<br\/>\nCLI is a clinical term used in <strong>vascular medicine, cardiology, interventional cardiology, and vascular surgery<\/strong>.<br\/>\nMany clinicians now also use the updated term <strong>chronic limb-threatening ischemia (CLTI)<\/strong> to describe the same high-risk spectrum.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Why CLI used (Purpose \/ benefits)<\/h2>\n\n\n\n<p>CLI is used to identify a <strong>high-risk stage of PAD<\/strong> where blood flow is low enough to threaten the viability of the limb. In simple terms, it helps clinicians recognize when reduced circulation is no longer just a walking-limitation problem (claudication), but a situation where <strong>skin, nerves, and soft tissue may not be getting enough oxygen even at rest<\/strong>.<\/p>\n\n\n\n<p>Key purposes include:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Risk stratification:<\/strong> CLI signals higher risk of limb complications (such as non-healing ulcers) and often coexists with higher overall cardiovascular risk because PAD reflects widespread atherosclerosis.<\/li>\n<li><strong>Symptom and wound interpretation:<\/strong> It provides a framework for interpreting <strong>rest pain<\/strong>, <strong>ulcers<\/strong>, or <strong>gangrene<\/strong> as potentially ischemic (blood-flow related), rather than only infectious, neuropathic, or traumatic.<\/li>\n<li><strong>Guiding urgency and workup:<\/strong> CLI typically triggers <strong>more urgent vascular assessment<\/strong>, including objective blood-flow testing and imaging to map arterial disease.<\/li>\n<li><strong>Directing treatment goals:<\/strong> In many cases, the clinical goal shifts toward <strong>limb preservation<\/strong> and <strong>wound healing<\/strong>, often requiring coordinated care (vascular evaluation, wound care, diabetes care, podiatry, and rehabilitation).<\/li>\n<\/ul>\n\n\n\n<p>CLI is not a single test result. It is a <strong>clinical syndrome<\/strong> supported by symptoms, exam findings, and objective measures of impaired limb perfusion.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Clinical context (When cardiologists or cardiovascular clinicians use it)<\/h2>\n\n\n\n<p>CLI is commonly considered or discussed in scenarios such as:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Foot or toe ulcers<\/strong> that do not heal as expected, especially in people with diabetes or known PAD<\/li>\n<li><strong>Rest pain<\/strong> in the forefoot or toes (often worse at night) that may improve when the leg is placed in a dependent position (hanging down)<\/li>\n<li><strong>Gangrene<\/strong> (dead tissue) of toes or parts of the foot<\/li>\n<li><strong>Markedly diminished pulses<\/strong> in the feet, cool extremities, or other exam findings suggesting poor arterial flow<\/li>\n<li><strong>Abnormal noninvasive perfusion tests<\/strong>, such as ankle-brachial index (ABI), toe pressures, or transcutaneous oxygen measurements (tests vary by clinician and case)<\/li>\n<li><strong>Pre-procedure planning<\/strong> for endovascular or surgical revascularization (opening blocked arteries)<\/li>\n<li><strong>Multidisciplinary limb-salvage discussions<\/strong>, particularly in patients with diabetes, kidney disease, or complex wounds<\/li>\n<li><strong>Differentiating chronic disease from acute limb ischemia<\/strong>, which is a sudden arterial blockage and a different emergency condition<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Contraindications \/ when it\u2019s NOT ideal<\/h2>\n\n\n\n<p>Because CLI is a <strong>diagnostic label\/syndrome<\/strong> rather than a single procedure, \u201ccontraindications\u201d mainly mean situations where the term is <strong>not the best fit<\/strong> or where other diagnoses should be prioritized.<\/p>\n\n\n\n<p>CLI may be <em>not ideal<\/em> to apply when:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Acute limb ischemia<\/strong> is suspected (sudden onset of severe pain, pallor, coldness, numbness, or loss of function). Acute limb ischemia is a different entity and typically requires immediate emergency evaluation.<\/li>\n<li>A wound is more consistent with a <strong>non-arterial cause<\/strong>, such as:<\/li>\n<li><strong>Venous stasis ulcers<\/strong> (often around the ankle with chronic swelling and skin changes)<\/li>\n<li><strong>Pressure injuries<\/strong> (from prolonged pressure)<\/li>\n<li><strong>Neuropathic ulcers<\/strong> (common in diabetes, often on pressure points; can coexist with ischemia)<\/li>\n<li>Pain is more consistent with <strong>non-ischemic causes<\/strong>, such as neuropathy, spinal stenosis, arthritis, or musculoskeletal injury (these can also coexist with PAD).<\/li>\n<li>The limb findings are driven by <strong>non-atherosclerotic vascular disease<\/strong>, where terminology and treatment pathways may differ (examples include vasculitis, embolic disease, thromboangiitis obliterans, or certain arterial entrapment syndromes). Evaluation varies by clinician and case.<\/li>\n<li>The term \u201cCLI\u201d is used without objective perfusion assessment. Many experts prefer pairing symptoms\/wounds with <strong>objective measures of blood flow<\/strong> to reduce misclassification.<\/li>\n<\/ul>\n\n\n\n<p>In practice, clinicians often use a broader, updated framework (commonly CLTI) that emphasizes <strong>limb threat severity<\/strong> and objective ischemia testing.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">How it works (Mechanism \/ physiology)<\/h2>\n\n\n\n<p>CLI results from <strong>insufficient arterial blood flow<\/strong> to meet the metabolic needs of the tissues in the lower limb\u2014particularly the foot. The most common underlying mechanism is <strong>atherosclerosis<\/strong>, the buildup of plaque inside arteries.<\/p>\n\n\n\n<p>High-level physiology:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Arterial narrowing or blockage<\/strong> reduces perfusion pressure and blood delivery beyond the obstruction.<\/li>\n<li>When flow is reduced enough, tissues can become ischemic <strong>even at rest<\/strong>, not only during walking.<\/li>\n<li>Poor perfusion impairs:<\/li>\n<li><strong>Skin integrity and wound healing<\/strong><\/li>\n<li><strong>Resistance to infection<\/strong><\/li>\n<li><strong>Microcirculatory function<\/strong> (small-vessel blood flow), which can be especially relevant in diabetes and chronic kidney disease<\/li>\n<li>Ischemia can present as:<\/li>\n<li><strong>Ischemic rest pain<\/strong> (often forefoot\/toe pain, classically worse at night)<\/li>\n<li><strong>Ulceration<\/strong> that does not heal because oxygen delivery is inadequate<\/li>\n<li><strong>Tissue loss<\/strong> (gangrene) when prolonged ischemia causes cell death<\/li>\n<\/ul>\n\n\n\n<p>Relevant anatomy (simplified):<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Blood reaches the legs through the <strong>aorta \u2192 iliac arteries \u2192 femoral arteries \u2192 popliteal artery \u2192 tibial\/peroneal arteries \u2192 pedal arteries<\/strong>.<\/li>\n<li>CLI often involves <strong>multilevel disease<\/strong>, commonly including the smaller arteries below the knee in people with diabetes (distribution varies by patient).<\/li>\n<\/ul>\n\n\n\n<p>Time course and interpretation:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>CLI is generally <strong>chronic<\/strong> and develops over time, but symptoms may worsen abruptly if a narrowing becomes critically tight, a clot forms on top of plaque, or infection increases tissue oxygen demand.<\/li>\n<li>Reversibility depends on the cause and severity. Some components (like pain from ischemia) may improve if perfusion improves; tissue loss may require prolonged wound care and may not fully reverse.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">CLI Procedure overview (How it\u2019s applied)<\/h2>\n\n\n\n<p>CLI is not itself a procedure. Clinically, it is <strong>assessed and managed through a structured evaluation and treatment pathway<\/strong>. A typical high-level workflow may look like this (exact steps vary by clinician and case):<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\n<p><strong>Evaluation \/ exam<\/strong>\n   &#8211; Symptom review (rest pain, walking limits), wound history, and infection screening\n   &#8211; Vascular exam (pulses, skin temperature\/color, capillary refill) and basic neurologic assessment\n   &#8211; Review of cardiovascular risk factors (diabetes, smoking exposure, kidney disease, cholesterol disorders, hypertension) and existing heart or cerebrovascular disease<\/p>\n<\/li>\n<li>\n<p><strong>Preparation (risk and limb assessment)<\/strong>\n   &#8211; Objective perfusion testing, commonly with <strong>ABI<\/strong> and\/or <strong>toe pressures<\/strong>; additional tests may be used when ABI is less reliable (for example, calcified arteries can falsely elevate ABI)\n   &#8211; Wound assessment (size, depth, drainage) and evaluation for infection; clinicians may involve wound care or podiatry<\/p>\n<\/li>\n<li>\n<p><strong>Intervention \/ testing (mapping the arteries)<\/strong>\n   &#8211; Noninvasive imaging such as <strong>duplex ultrasound<\/strong> and\/or cross-sectional imaging (CTA or MRA) when appropriate\n   &#8211; <strong>Catheter angiography<\/strong> in selected cases, particularly when endovascular treatment is being considered<\/p>\n<\/li>\n<li>\n<p><strong>Immediate checks (goal alignment and limb safety)<\/strong>\n   &#8211; Determine whether the plan is <strong>medical therapy alone<\/strong>, <strong>revascularization<\/strong> (endovascular or surgery), <strong>wound procedures<\/strong>, or a combination\n   &#8211; Assess pain control needs and infection management as part of a coordinated plan (details vary)<\/p>\n<\/li>\n<li>\n<p><strong>Follow-up<\/strong>\n   &#8211; Repeat clinical checks of symptoms, pulses\/perfusion tests when indicated, and wound healing progress\n   &#8211; Ongoing cardiovascular risk management and functional rehabilitation planning<\/p>\n<\/li>\n<\/ol>\n\n\n\n<h2 class=\"wp-block-heading\">Types \/ variations<\/h2>\n\n\n\n<p>CLI is commonly described along several clinically useful dimensions:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Symptom-based categories<\/strong><\/li>\n<li><strong>Ischemic rest pain<\/strong> without tissue loss<\/li>\n<li>\n<p><strong>Tissue loss<\/strong>, including non-healing ulcers or gangrene<\/p>\n<\/li>\n<li>\n<p><strong>Severity staging systems<\/strong><\/p>\n<\/li>\n<li>Rutherford classification and other staging approaches may be used to categorize symptoms and tissue loss.<\/li>\n<li>\n<p>Some contemporary frameworks emphasize <strong>wound severity, ischemia level, and infection<\/strong> together (exact system use varies).<\/p>\n<\/li>\n<li>\n<p><strong>Time course<\/strong><\/p>\n<\/li>\n<li><strong>Chronic limb ischemia<\/strong> progressing over weeks to months (typical CLI pattern)<\/li>\n<li>\n<p><strong>Acute on chronic ischemia<\/strong>, where a chronic narrowing suddenly worsens (e.g., thrombosis on plaque), producing rapid symptom escalation<\/p>\n<\/li>\n<li>\n<p><strong>Anatomic patterns<\/strong><\/p>\n<\/li>\n<li><strong>Aorto-iliac disease<\/strong> (higher up in the pelvis)<\/li>\n<li><strong>Femoro-popliteal disease<\/strong> (thigh\/knee region)<\/li>\n<li>\n<p><strong>Infrapopliteal disease<\/strong> (below-knee tibial arteries), commonly relevant in diabetes<\/p>\n<\/li>\n<li>\n<p><strong>Patient\/context variations<\/strong><\/p>\n<\/li>\n<li>CLI with <strong>diabetes<\/strong> (often neuropathy, higher ulcer risk, and calcified arteries affecting test interpretation)<\/li>\n<li>CLI with <strong>chronic kidney disease<\/strong> (often more diffuse arterial disease; management complexity varies)<\/li>\n<li>CLI in the setting of <strong>prior revascularization<\/strong> (restenosis or graft issues may be considered)<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Pros and cons<\/h2>\n\n\n\n<p>Pros:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Helps identify a <strong>high-risk PAD stage<\/strong> where limb viability may be threatened.<\/li>\n<li>Encourages <strong>objective perfusion testing<\/strong> rather than relying on symptoms alone.<\/li>\n<li>Promotes <strong>multidisciplinary care<\/strong>, integrating vascular assessment, wound care, and risk-factor management.<\/li>\n<li>Provides a common clinical language for <strong>triage and urgency<\/strong> decisions.<\/li>\n<li>Supports structured decision-making about <strong>revascularization vs. conservative approaches<\/strong> (varies by clinician and case).<\/li>\n<\/ul>\n\n\n\n<p>Cons:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>The term can be <strong>imprecise<\/strong> if used without objective measures of ischemia.<\/li>\n<li>CLI is a <strong>heterogeneous syndrome<\/strong>\u2014two patients with \u201cCLI\u201d may have very different anatomy, wound burden, and prognosis.<\/li>\n<li>It may <strong>overlap with other causes<\/strong> of pain and ulcers (neuropathy, venous disease, infection), complicating diagnosis.<\/li>\n<li>Some clinicians consider CLI an <strong>older term<\/strong> and prefer CLTI-based staging to better reflect wound and infection severity.<\/li>\n<li>Focus on the limb can overshadow that PAD reflects <strong>systemic atherosclerosis<\/strong>, requiring broader cardiovascular risk assessment (without implying specific treatment steps).<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Aftercare &amp; longevity<\/h2>\n\n\n\n<p>Outcomes after a CLI diagnosis depend on multiple factors, and \u201clongevity\u201d can refer to both <strong>limb outcomes<\/strong> (healing, recurrence) and <strong>vascular durability<\/strong> after any intervention.<\/p>\n\n\n\n<p>General factors that influence outcomes include:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Severity at presentation:<\/strong> Rest pain alone differs from extensive tissue loss or infection.<\/li>\n<li><strong>Anatomic complexity:<\/strong> Multilevel or small-vessel disease can be more challenging to treat; durability varies by approach and patient factors.<\/li>\n<li><strong>Comorbidities:<\/strong> Diabetes, chronic kidney disease, heart disease, and frailty can affect wound healing and procedural risk.<\/li>\n<li><strong>Tobacco exposure:<\/strong> Smoking is strongly associated with PAD progression; the impact of cessation varies by individual.<\/li>\n<li><strong>Foot care and wound care quality:<\/strong> Offloading, dressing strategies, and infection control influence healing (specific plans vary by clinician and case).<\/li>\n<li><strong>Follow-up and surveillance:<\/strong> Clinicians may monitor symptoms, pulses, noninvasive tests, and wound status to detect recurrence or complications early.<\/li>\n<li><strong>Revascularization approach and materials:<\/strong> Patency and durability can vary by technique, lesion length, vessel size, and device\/material choice (varies by material and manufacturer).<\/li>\n<\/ul>\n\n\n\n<p>Many patients require <strong>ongoing<\/strong> vascular and wound follow-up because PAD is typically chronic and may progress.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Alternatives \/ comparisons<\/h2>\n\n\n\n<p>Because CLI describes severe PAD, \u201calternatives\u201d usually refer to <strong>different management strategies<\/strong> or <strong>different ways to evaluate perfusion<\/strong>, depending on limb threat and patient context.<\/p>\n\n\n\n<p>Common comparisons include:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>CLI vs intermittent claudication<\/strong><\/li>\n<li>Claudication is exertional leg pain due to PAD that improves with rest and is not immediately limb-threatening.<\/li>\n<li>\n<p>CLI involves rest pain and\/or tissue loss and generally signals higher urgency for perfusion assessment.<\/p>\n<\/li>\n<li>\n<p><strong>CLI\/CLTI vs acute limb ischemia<\/strong><\/p>\n<\/li>\n<li>CLI is typically chronic and progressive.<\/li>\n<li>\n<p>Acute limb ischemia is sudden and time-sensitive, often requiring emergency evaluation; management pathways differ.<\/p>\n<\/li>\n<li>\n<p><strong>Medical management vs revascularization<\/strong><\/p>\n<\/li>\n<li>Medical therapy and risk-factor management are foundational in PAD, but CLI often prompts evaluation for <strong>restoring blood flow<\/strong> when feasible.<\/li>\n<li>\n<p>The choice depends on anatomy, wound severity, comorbidities, and patient goals (varies by clinician and case).<\/p>\n<\/li>\n<li>\n<p><strong>Endovascular vs surgical approaches<\/strong><\/p>\n<\/li>\n<li>Endovascular options (balloon angioplasty, stenting, atherectomy in selected cases) are less invasive but durability varies.<\/li>\n<li>\n<p>Surgical bypass can be effective for certain patterns of disease but is more invasive and depends on conduit availability and surgical risk.<\/p>\n<\/li>\n<li>\n<p><strong>Noninvasive testing vs invasive angiography<\/strong><\/p>\n<\/li>\n<li>ABI, toe pressures, duplex ultrasound, CTA, and MRA can provide valuable information without catheter insertion.<\/li>\n<li>\n<p>Catheter angiography offers detailed mapping and can allow treatment in the same setting, but it is invasive and carries procedural risks.<\/p>\n<\/li>\n<li>\n<p><strong>Limb salvage vs primary amputation<\/strong><\/p>\n<\/li>\n<li>Limb-salvage pathways may include revascularization plus wound care.<\/li>\n<li>In selected situations (extensive non-salvageable tissue loss, severe infection, or high procedural risk), amputation may be discussed; decisions are individualized.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">CLI Common questions (FAQ)<\/h2>\n\n\n\n<p><strong>Q: Is CLI the same thing as PAD?<\/strong><br\/>\nCLI is usually considered a <strong>severe stage of PAD<\/strong>, not a separate disease. PAD can exist with mild or moderate symptoms, while CLI generally involves rest pain and\/or tissue loss due to markedly reduced blood flow. Some clinicians use CLTI as a more descriptive modern term.<\/p>\n\n\n\n<p><strong>Q: What symptoms make clinicians think about CLI?<\/strong><br\/>\nCommon triggers include <strong>pain in the foot or toes at rest<\/strong>, <strong>non-healing ulcers<\/strong>, or <strong>gangrene<\/strong>. Symptoms are interpreted together with physical exam findings and objective blood-flow testing.<\/p>\n\n\n\n<p><strong>Q: Does CLI always cause pain?<\/strong><br\/>\nNot always. Some people\u2014especially those with <strong>diabetic neuropathy<\/strong>\u2014may have reduced sensation and may not feel typical ischemic pain even with significant tissue injury. That is one reason ulcers and skin changes are evaluated carefully.<\/p>\n\n\n\n<p><strong>Q: Is CLI an emergency?<\/strong><br\/>\nCLI is serious and time-sensitive, but it is typically <strong>chronic<\/strong> rather than sudden. A different condition, <strong>acute limb ischemia<\/strong>, is a true emergency with abrupt symptom onset. Clinicians sort these out based on timing, exam, and perfusion testing.<\/p>\n\n\n\n<p><strong>Q: What tests are commonly used to evaluate CLI?<\/strong><br\/>\nClinicians often start with noninvasive assessments like <strong>ABI<\/strong> and\/or <strong>toe pressures<\/strong>, plus vascular ultrasound. CTA, MRA, or catheter angiography may be used to define arterial anatomy and plan treatment, depending on the situation.<\/p>\n\n\n\n<p><strong>Q: Will I need to be hospitalized?<\/strong><br\/>\nHospitalization depends on factors such as <strong>infection, wound severity, pain control needs, and whether an urgent procedure is planned<\/strong>. Some evaluations and treatments occur outpatient, while others require inpatient care. This varies by clinician and case.<\/p>\n\n\n\n<p><strong>Q: Is revascularization always possible in CLI?<\/strong><br\/>\nNot always. Feasibility depends on arterial anatomy, the extent of small-vessel disease, prior procedures, and overall health status. When revascularization options are limited, clinicians may focus on wound care, infection control, and other supportive strategies.<\/p>\n\n\n\n<p><strong>Q: How long do results last after treatment for CLI?<\/strong><br\/>\nDurability varies based on the <strong>type of procedure<\/strong>, location and length of arterial disease, and patient-specific factors. Some patients need repeat interventions over time, while others have longer-lasting results. Follow-up plans are individualized.<\/p>\n\n\n\n<p><strong>Q: Is CLI treatment \u201csafe\u201d?<\/strong><br\/>\nEvery approach\u2014medical therapy, endovascular procedures, surgery, and wound interventions\u2014has potential benefits and risks. Risk depends on comorbidities (such as kidney disease or heart disease), anatomy, and procedural complexity. A clinician typically discusses risk in patient-specific terms.<\/p>\n\n\n\n<p><strong>Q: What about cost for CLI care?<\/strong><br\/>\nCosts vary widely based on testing (imaging type), procedures, hospitalization, wound supplies, and follow-up needs. Insurance coverage, region, and facility type also affect out-of-pocket costs. It\u2019s common to request an estimate through the treating health system.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>CLI most commonly refers to **critical limb ischemia**, a severe form of **peripheral artery disease (PAD)**. It describes **chronic, markedly reduced blood flow** to a leg or foot that can cause **rest pain, non-healing wounds, or tissue loss**. CLI is a clinical term used in **vascular medicine, cardiology, interventional cardiology, and vascular surgery**. Many clinicians now also use the updated term **chronic limb-threatening ischemia (CLTI)** to describe the same high-risk spectrum.<\/p>\n","protected":false},"author":9,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[],"tags":[],"class_list":["post-3082","post","type-post","status-publish","format-standard","hentry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v25.8 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>CLI: Definition, Uses, and Clinical Overview - Best Spine Hospitals<\/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:\/\/www.bestspinehospitals.com\/blog\/cli-definition-uses-and-clinical-overview\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"CLI: Definition, Uses, and Clinical Overview - Best Spine Hospitals\" \/>\n<meta property=\"og:description\" content=\"CLI most commonly refers to **critical limb ischemia**, a severe form of **peripheral artery disease (PAD)**. It describes **chronic, markedly reduced blood flow** to a leg or foot that can cause **rest pain, non-healing wounds, or tissue loss**. CLI is a clinical term used in **vascular medicine, cardiology, interventional cardiology, and vascular surgery**. 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