{"id":2450,"date":"2026-02-27T13:59:42","date_gmt":"2026-02-27T13:59:42","guid":{"rendered":"https:\/\/www.bestspinehospitals.com\/blog\/inferior-articular-process-definition-uses-and-clinical-overview\/"},"modified":"2026-02-27T13:59:42","modified_gmt":"2026-02-27T13:59:42","slug":"inferior-articular-process-definition-uses-and-clinical-overview","status":"publish","type":"post","link":"https:\/\/www.bestspinehospitals.com\/blog\/inferior-articular-process-definition-uses-and-clinical-overview\/","title":{"rendered":"Inferior articular process: Definition, Uses, and Clinical Overview"},"content":{"rendered":"\n<h2 class=\"wp-block-heading\">Inferior articular process Introduction (What it is)<\/h2>\n\n\n\n<p>The Inferior articular process is a bony projection on the back part of a spinal vertebra.<br\/>\nIt forms the lower half of a paired joint called a facet (zygapophyseal) joint.<br\/>\nFacet joints help guide and limit spinal motion while sharing load with discs and ligaments.<br\/>\nClinicians most often discuss the Inferior articular process when evaluating facet-related pain, instability, or narrowing around spinal nerves.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Why Inferior articular process is used (Purpose \/ benefits)<\/h2>\n\n\n\n<p>The Inferior articular process is not a treatment or device\u2014it is a normal anatomical structure with important functions. Understanding it helps patients and trainees make sense of how the spine moves and why certain conditions cause pain or nerve symptoms.<\/p>\n\n\n\n<p>In general, the Inferior articular process matters clinically because it:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Creates a facet joint surface<\/strong> that articulates (moves) with the superior articular process of the vertebra below. This pairing contributes to smooth, controlled motion between vertebrae.<\/li>\n<li><strong>Helps stabilize each motion segment<\/strong> (two adjacent vertebrae and the disc between them) by limiting excessive rotation, bending, or translation, depending on the spinal level.<\/li>\n<li><strong>Contributes to load sharing<\/strong> in the posterior (back) part of the spine, especially during extension (backward bending) and rotation.<\/li>\n<li><strong>Can be involved in pain generation<\/strong> when the facet joint becomes arthritic, inflamed, or injured. Facet joint pain is a common consideration in neck and low-back pain evaluations.<\/li>\n<li><strong>Can affect nerve space<\/strong> indirectly. Degenerative changes around the facet joint region can contribute to narrowing (stenosis) of spaces near nerve roots, particularly in the lumbar spine.<\/li>\n<\/ul>\n\n\n\n<p>Because the Inferior articular process is part of a joint, it is frequently referenced in imaging reports (X-ray, CT, MRI) and in discussions of procedures that target facet joint\u2013mediated pain.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Indications (When spine specialists use it)<\/h2>\n\n\n\n<p>Spine specialists may focus on the Inferior articular process in scenarios such as:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Suspected <strong>facet joint\u2013mediated neck or back pain<\/strong> (often described as localized pain with certain movements)<\/li>\n<li><strong>Degenerative facet arthropathy<\/strong> (facet \u201carthritis\u201d) seen on imaging alongside symptoms<\/li>\n<li>Evaluation of <strong>spinal stenosis<\/strong> patterns where facet enlargement contributes to narrowing<\/li>\n<li>Suspected or confirmed <strong>spondylolisthesis<\/strong> (one vertebra slipping relative to another), where facet joint anatomy and alignment are relevant<\/li>\n<li><strong>Trauma<\/strong> with concern for posterior element fractures, including injuries involving the articular processes<\/li>\n<li>Preoperative planning for surgeries where the facet region may be partially removed or stabilized (for example, decompression or fusion planning)<\/li>\n<li>Assessment of <strong>post-surgical anatomy<\/strong> when hardware placement and facet integrity matter (varies by procedure and level)<\/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 the Inferior articular process is anatomy rather than a therapy, \u201ccontraindications\u201d mainly apply to how much emphasis clinicians should place on it during diagnosis or treatment planning. Situations where it may be less relevant or where other approaches may be more appropriate include:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Symptoms not consistent with facet involvement<\/strong>, such as classic nerve-root pain patterns from a disc herniation (varies by clinician and case)<\/li>\n<li><strong>Imaging findings that do not match symptoms<\/strong>, since facet changes can be incidental and increase with age without necessarily causing pain<\/li>\n<li>Pain primarily arising from <strong>non-spinal sources<\/strong> (hip pathology, abdominal\/pelvic conditions, vascular issues), where focusing on facet anatomy may delay correct diagnosis<\/li>\n<li>Situations where the key problem is <strong>disc-driven instability or discogenic pain<\/strong>, where other structures are more central to evaluation<\/li>\n<li>Predominant <strong>sacroiliac joint<\/strong> pain patterns in the low back, where attention shifts away from lumbar facet joints<\/li>\n<li>When planning interventions, some patients may not be ideal for certain facet-targeting procedures due to factors like bleeding risk, infection risk, or anatomy\u2014<strong>the relevance depends on the intervention<\/strong>, not the Inferior articular process itself (varies by clinician and case)<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">How it works (Mechanism \/ physiology)<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">Where the Inferior articular process fits in spine anatomy<\/h3>\n\n\n\n<p>Each vertebra has posterior elements that include:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Pedicles and laminae<\/strong> (the bony ring protecting the spinal cord and nerves)<\/li>\n<li><strong>Spinous process<\/strong> (the midline bony \u201cbump\u201d you can often feel)<\/li>\n<li><strong>Transverse processes<\/strong> (side projections for muscle\/ligament attachment)<\/li>\n<li><strong>Superior and inferior articular processes<\/strong> (paired joint projections that form facet joints)<\/li>\n<\/ul>\n\n\n\n<p>The Inferior articular process of an upper vertebra meets the <strong>superior articular process of the vertebra below<\/strong>. Together, their cartilage-covered surfaces form a <strong>facet joint<\/strong>, surrounded by a capsule and supported by nearby ligaments and muscles.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Biomechanical principle: guidance and restraint of motion<\/h3>\n\n\n\n<p>Facet joints act like <strong>guided rails<\/strong> for movement:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>They <strong>permit<\/strong> motion such as flexion\/extension and controlled rotation.<\/li>\n<li>They <strong>limit<\/strong> excessive sliding and twisting that could threaten stability.<\/li>\n<li>They <strong>share load<\/strong> with the intervertebral disc, particularly during extension and certain rotational postures.<\/li>\n<\/ul>\n\n\n\n<p>Facet joint orientation varies by region:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Cervical (neck):<\/strong> facet orientation favors mobility (rotation and bending) while still providing stability.<\/li>\n<li><strong>Thoracic (mid-back):<\/strong> rib cage and facet orientation favor stability and limit motion.<\/li>\n<li><strong>Lumbar (low back):<\/strong> facet orientation helps resist rotation and supports flexion\/extension and load-bearing.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Relationship to nerves and symptoms<\/h3>\n\n\n\n<p>The Inferior articular process itself is bone, but problems around the facet joint complex can affect nearby structures:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Joint capsule and synovium<\/strong> can become irritated and painful.<\/li>\n<li><strong>Medial branch nerves<\/strong> (small sensory nerves) carry pain signals from facet joints.<\/li>\n<li><strong>Adjacent spaces for nerve roots<\/strong> can narrow when facets enlarge or when degenerative changes cause thickening and bony overgrowth. This can contribute to stenosis patterns, especially in the lumbar spine.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Onset, duration, and reversibility<\/h3>\n\n\n\n<p>The Inferior articular process does not have an \u201conset\u201d like a medication. Instead, clinical relevance develops when:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Degeneration<\/strong> accumulates over time (often gradual, variable, and not always symptomatic).<\/li>\n<li><strong>Injury<\/strong> occurs acutely (for example, trauma affecting posterior elements).<\/li>\n<li><strong>Inflammation or mechanical irritation<\/strong> fluctuates with activity and posture.<\/li>\n<\/ul>\n\n\n\n<p>Whether symptoms are reversible depends on the underlying cause and the broader clinical picture (varies by clinician and case).<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Inferior articular process Procedure overview (How it\u2019s applied)<\/h2>\n\n\n\n<p>The Inferior articular process is not applied or administered. Instead, clinicians evaluate it as part of spinal anatomy and may target the facet joint system in diagnostic or therapeutic procedures when appropriate.<\/p>\n\n\n\n<p>A typical high-level workflow looks like this:<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\n<p><strong>Evaluation \/ exam<\/strong>\n   &#8211; History of pain pattern (location, triggers, duration) and any neurologic symptoms\n   &#8211; Physical exam focusing on range of motion, tenderness, and neurologic function<\/p>\n<\/li>\n<li>\n<p><strong>Imaging \/ diagnostics<\/strong>\n   &#8211; <strong>X-rays<\/strong> may show alignment changes or degenerative signs.\n   &#8211; <strong>CT<\/strong> can show bony anatomy in detail, including articular processes and fractures.\n   &#8211; <strong>MRI<\/strong> helps evaluate discs, nerves, and soft tissues and can show facet joint fluid or inflammation-like changes (interpretation varies).<\/p>\n<\/li>\n<li>\n<p><strong>Preparation (if a facet-related procedure is being considered)<\/strong>\n   &#8211; Review medications and medical history\n   &#8211; Decide on the role of image guidance (commonly used for injections)<\/p>\n<\/li>\n<li>\n<p><strong>Intervention \/ testing (examples tied to facet joints rather than the bone itself)<\/strong>\n   &#8211; Diagnostic injections (e.g., medial branch blocks) may be used to test whether facet joints are likely pain generators.\n   &#8211; Therapeutic options may include facet joint injections or radiofrequency procedures (selection varies by clinician and case).<\/p>\n<\/li>\n<li>\n<p><strong>Immediate checks<\/strong>\n   &#8211; Symptom response assessment and monitoring for short-term side effects (depends on the procedure)<\/p>\n<\/li>\n<li>\n<p><strong>Follow-up \/ rehab<\/strong>\n   &#8211; Reassessment of function and symptoms over time\n   &#8211; A broader plan may include physical therapy, activity modification strategies, and management of contributing factors (general concepts; specifics vary)<\/p>\n<\/li>\n<\/ol>\n\n\n\n<h2 class=\"wp-block-heading\">Types \/ variations<\/h2>\n\n\n\n<p>\u201cInferior articular process\u201d refers to a consistent structure, but there are meaningful variations in anatomy and clinical context.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">By spinal region<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Cervical Inferior articular process<\/strong><\/li>\n<li>Part of smaller facet joints designed for mobility<\/li>\n<li>\n<p>Often discussed in neck pain and whiplash-related evaluations, as well as cervical spondylosis<\/p>\n<\/li>\n<li>\n<p><strong>Thoracic Inferior articular process<\/strong><\/p>\n<\/li>\n<li>Works with ribs and thoracic anatomy to emphasize stability<\/li>\n<li>\n<p>Less commonly the primary focus of pain discussions, though thoracic facet pain and fractures can occur<\/p>\n<\/li>\n<li>\n<p><strong>Lumbar Inferior articular process<\/strong><\/p>\n<\/li>\n<li>Frequently referenced due to lumbar facet arthropathy, spondylolisthesis, and stenosis patterns<\/li>\n<li>Plays a role in segmental stability under load<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">By morphology and alignment<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Facet joint orientation and asymmetry<\/strong> can vary between individuals and spinal levels.<\/li>\n<li><strong>Degenerative changes<\/strong> may include joint space narrowing, bony enlargement, and irregularity around the articular processes.<\/li>\n<li><strong>Congenital or developmental variants<\/strong> can influence motion mechanics (clinical relevance varies by clinician and case).<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">By clinical scenario<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Degenerative facet arthropathy<\/strong> (wear-and-tear changes)<\/li>\n<li><strong>Inflammatory facet joint conditions<\/strong> (less common; depends on systemic disease context)<\/li>\n<li><strong>Traumatic involvement<\/strong> (fractures of posterior elements may include articular processes)<\/li>\n<li><strong>Post-surgical anatomy<\/strong> (procedures that decompress nerves may alter parts of the facet complex; extent varies)<\/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 form <strong>stable, guided joints<\/strong> that support normal spinal motion<\/li>\n<li>Contributes to <strong>load sharing<\/strong> and may reduce stress on discs in certain positions<\/li>\n<li>Provides a clear <strong>anatomic target for imaging interpretation<\/strong> of posterior element degeneration or injury<\/li>\n<li>Enables <strong>diagnostic reasoning<\/strong> about facet-mediated pain when correlated with symptoms and exam<\/li>\n<li>Supports <strong>surgical planning landmarks<\/strong> in procedures involving decompression, stabilization, or fusion (details vary)<\/li>\n<\/ul>\n\n\n\n<p>Cons:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Degenerative changes<\/strong> around the Inferior articular process\/facet joint can contribute to pain and stiffness<\/li>\n<li>Facet changes on imaging can be <strong>poorly correlated with symptoms<\/strong> in some people, complicating interpretation<\/li>\n<li>Enlargement and arthropathy can contribute to <strong>narrowing near nerve pathways<\/strong>, potentially worsening stenosis patterns<\/li>\n<li>The facet region is part of a complex motion segment, so symptoms are often <strong>multifactorial<\/strong> (disc, muscles, ligaments, nerves)<\/li>\n<li>When procedures target facet pain pathways, results can be <strong>variable<\/strong> and depend on diagnosis, technique, and patient factors (varies by clinician and case)<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Aftercare &amp; longevity<\/h2>\n\n\n\n<p>Aftercare depends on whether the Inferior articular process is simply an imaging finding, a suspected pain contributor, or part of a condition being treated with an intervention.<\/p>\n\n\n\n<p>Factors that commonly influence longer-term outcomes in facet-related conditions include:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Severity and type of underlying condition<\/strong><\/li>\n<li>Mild degenerative changes may be managed differently than advanced stenosis or instability.<\/li>\n<li><strong>Functional status and conditioning<\/strong><\/li>\n<li>Muscle support, movement patterns, and general fitness can influence symptoms (without implying a single best approach).<\/li>\n<li><strong>Follow-up and reassessment<\/strong><\/li>\n<li>Spine symptoms often evolve; follow-up helps ensure the working diagnosis still fits the presentation.<\/li>\n<li><strong>Bone quality and overall health<\/strong><\/li>\n<li>Bone density and systemic health can affect fracture risk and surgical considerations.<\/li>\n<li><strong>Coexisting spine problems<\/strong><\/li>\n<li>Disc degeneration, spinal alignment changes, or hip\/sacroiliac issues can maintain symptoms even if facet findings exist.<\/li>\n<li><strong>If a procedure is performed<\/strong><\/li>\n<li>Longevity of symptom relief (if any) varies by procedure type, diagnostic accuracy, and individual biology (varies by clinician and case).<\/li>\n<li>Post-procedure expectations and timelines also vary by intervention and clinician.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Alternatives \/ comparisons<\/h2>\n\n\n\n<p>Because the Inferior articular process is anatomy, \u201calternatives\u201d are best understood as alternative explanations for symptoms and alternative management paths when facet involvement is suspected.<\/p>\n\n\n\n<p>Common comparisons include:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Observation \/ monitoring<\/strong><\/li>\n<li>Appropriate when symptoms are mild, stable, or improving, and when serious causes are not suspected.<\/li>\n<li>\n<p>Imaging findings in the facet region may be monitored over time rather than treated directly.<\/p>\n<\/li>\n<li>\n<p><strong>Medications and physical therapy<\/strong><\/p>\n<\/li>\n<li>Often used for nonspecific neck or back pain, including suspected facet-related pain.<\/li>\n<li>\n<p>These approaches address pain modulation, movement tolerance, and function rather than changing the Inferior articular process itself.<\/p>\n<\/li>\n<li>\n<p><strong>Injections and diagnostic blocks<\/strong><\/p>\n<\/li>\n<li>Used when clinicians need to clarify whether facet joints are significant pain generators.<\/li>\n<li>\n<p>Compared with \u201ctreat-and-see\u201d approaches, blocks can add diagnostic information, but interpretation can be complex (varies by clinician and case).<\/p>\n<\/li>\n<li>\n<p><strong>Radiofrequency procedures vs injections<\/strong><\/p>\n<\/li>\n<li>Both can target facet pain pathways; the choice depends on diagnosis, response to diagnostic steps, and clinician preference.<\/li>\n<li>\n<p>Expected duration of benefit, if any, varies and is not guaranteed.<\/p>\n<\/li>\n<li>\n<p><strong>Surgery vs conservative care<\/strong><\/p>\n<\/li>\n<li>Surgery is generally discussed when there is nerve compression, instability, deformity, or persistent symptoms that do not improve with non-surgical care (broad concepts; thresholds vary).<\/li>\n<li>\n<p>When surgery involves decompression, some facet components may be preserved or partially removed depending on the goal and anatomy.<\/p>\n<\/li>\n<li>\n<p><strong>Other pain generators<\/strong><\/p>\n<\/li>\n<li>Discogenic pain, nerve root compression from a herniated disc, myofascial pain, vertebral fracture, and sacroiliac joint dysfunction can mimic or overlap with facet-related pain patterns.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Inferior articular process Common questions (FAQ)<\/h2>\n\n\n\n<p><strong>Q: Is the Inferior articular process a nerve or a disc?<\/strong><br\/>\nIt is bone. Specifically, it is a bony projection on a vertebra that helps form a facet joint with the vertebra below. Discs sit between vertebral bodies in the front; facet joints are in the back part of the spine.<\/p>\n\n\n\n<p><strong>Q: Can the Inferior articular process cause back or neck pain?<\/strong><br\/>\nIt can be part of a painful facet joint when the joint capsule and surrounding structures are irritated or arthritic. However, many people have facet changes on imaging without pain, so symptoms must be interpreted alongside exam findings and the overall clinical picture.<\/p>\n\n\n\n<p><strong>Q: What does \u201cinferior articular process hypertrophy\u201d mean on an imaging report?<\/strong><br\/>\n\u201cHypertrophy\u201d generally means thickening or enlargement of bone in the facet region, often related to degenerative change. It may be noted as a contributor to narrowing near nerves, but its clinical significance depends on symptoms and other findings.<\/p>\n\n\n\n<p><strong>Q: How do clinicians figure out if pain is coming from the facet joint region?<\/strong><br\/>\nThey typically combine the history, physical exam, and imaging to form a suspicion. In some cases, diagnostic injections (such as medial branch blocks) are used to test whether numbing facet-related nerves changes pain in a meaningful way. Interpretation and thresholds vary by clinician and case.<\/p>\n\n\n\n<p><strong>Q: Does evaluating the Inferior articular process require anesthesia?<\/strong><br\/>\nNo. Evaluation is usually done through an office exam and imaging. If a procedure is performed (like an injection), local anesthetic is often used, and sedation practices vary by setting and clinician.<\/p>\n\n\n\n<p><strong>Q: If a facet-related injection or procedure is done, how long do results last?<\/strong><br\/>\nDuration varies widely and depends on the diagnosis, the specific procedure, and individual factors. Some approaches are primarily diagnostic, while others aim to provide symptom relief for a period of time. No specific duration is guaranteed.<\/p>\n\n\n\n<p><strong>Q: Is it \u201cdangerous\u201d to have degeneration of the Inferior articular process?<\/strong><br\/>\nDegenerative changes are common and are not automatically dangerous. Concern increases when changes correlate with significant symptoms, neurologic deficits, or substantial narrowing around nerve structures. Determining significance is case-specific.<\/p>\n\n\n\n<p><strong>Q: Will I need surgery if my report mentions the Inferior articular process?<\/strong><br\/>\nNot necessarily. Many imaging findings involving facet joints are managed without surgery, especially when symptoms are manageable and there are no progressive neurologic issues. Surgical consideration depends on the full clinical context and goals of care (varies by clinician and case).<\/p>\n\n\n\n<p><strong>Q: Can I drive or work after facet-related procedures involving this region?<\/strong><br\/>\nRestrictions depend on the type of procedure, whether sedation was used, and workplace demands. Many facilities provide procedure-specific instructions, and recommendations vary by clinician and case. In general, short-term limitations are often precautionary rather than related to the Inferior articular process itself.<\/p>\n\n\n\n<p><strong>Q: What about cost\u2014are facet evaluations or procedures expensive?<\/strong><br\/>\nCosts can vary substantially based on location, insurance coverage, facility fees, imaging type, and the procedure performed. A clinic or hospital billing team can usually provide a case-specific estimate, but there is no single standard range that applies to everyone.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>The Inferior articular process is a bony projection on the back part of a spinal vertebra. It forms the lower half of a paired joint called a facet (zygapophyseal) joint. Facet joints help guide and limit spinal motion while sharing load with discs and ligaments. Clinicians most often discuss the Inferior articular process when evaluating facet-related pain, instability, or narrowing around spinal nerves.<\/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-2450","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>Inferior articular process: 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\/inferior-articular-process-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=\"Inferior articular process: Definition, Uses, and Clinical Overview - Best Spine Hospitals\" \/>\n<meta property=\"og:description\" content=\"The Inferior articular process is a bony projection on the back part of a spinal vertebra. It forms the lower half of a paired joint called a facet (zygapophyseal) joint. Facet joints help guide and limit spinal motion while sharing load with discs and ligaments. 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