{"id":2578,"date":"2026-02-27T15:46:23","date_gmt":"2026-02-27T15:46:23","guid":{"rendered":"https:\/\/www.bestspinehospitals.com\/blog\/global-alignment-definition-uses-and-clinical-overview\/"},"modified":"2026-02-27T15:46:23","modified_gmt":"2026-02-27T15:46:23","slug":"global-alignment-definition-uses-and-clinical-overview","status":"publish","type":"post","link":"https:\/\/www.bestspinehospitals.com\/blog\/global-alignment-definition-uses-and-clinical-overview\/","title":{"rendered":"Global alignment: Definition, Uses, and Clinical Overview"},"content":{"rendered":"\n<h2 class=\"wp-block-heading\">Global alignment Introduction (What it is)<\/h2>\n\n\n\n<p>Global alignment describes how the head, spine, pelvis, and legs line up as a whole when a person stands or moves.<br\/>\nIt is most commonly discussed in spine clinics when evaluating posture, spinal balance, and spinal deformity.<br\/>\nIt helps clinicians connect symptoms (like fatigue or back pain) with overall body mechanics.<br\/>\nIt is typically assessed with a physical exam and full-length standing imaging.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Why Global alignment is used (Purpose \/ benefits)<\/h2>\n\n\n\n<p>The spine is not just a stack of bones; it is part of a linked system that includes the pelvis, hips, knees, and feet. When one area loses its normal curve or shifts out of balance, other areas often \u201ccompensate\u201d to keep the eyes level and allow standing and walking. Over time, these compensations can contribute to pain, muscle fatigue, uneven loading of joints, and functional limits.<\/p>\n\n\n\n<p>Global alignment is used to:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Describe overall posture and balance<\/strong> rather than focusing only on a single disc, vertebra, or joint.<\/li>\n<li><strong>Identify compensations<\/strong> (for example, bending the knees, rotating the pelvis, or extending the neck) that may mask the true location of the primary problem.<\/li>\n<li><strong>Guide treatment planning<\/strong> in both conservative care (rehabilitation goals, bracing considerations) and surgical care (deformity correction planning, fusion levels, and alignment targets).<\/li>\n<li><strong>Track change over time<\/strong>, such as progression of adult spinal deformity, post-surgical changes, or response to therapy.<\/li>\n<li><strong>Improve communication<\/strong> among clinicians by using shared terms and measurements for \u201cbalance\u201d and \u201cmalalignment.\u201d<\/li>\n<\/ul>\n\n\n\n<p>Importantly, global alignment does not directly \u201ctreat\u201d a condition. It is a clinical framework and measurement approach used to understand how the whole body is organized around the spine.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Indications (When spine specialists use it)<\/h2>\n\n\n\n<p>Spine specialists commonly assess Global alignment in scenarios such as:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Suspected or known <strong>adult spinal deformity<\/strong> (e.g., scoliosis, kyphosis, flatback posture)<\/li>\n<li><strong>Forward-stooped posture<\/strong> or difficulty standing upright for long periods<\/li>\n<li>Persistent <strong>back pain with fatigue<\/strong> that worsens with standing or walking<\/li>\n<li><strong>Neck pain or headaches<\/strong> associated with compensatory head\/neck positioning<\/li>\n<li>Preoperative planning for <strong>spine fusion<\/strong> or <strong>deformity correction<\/strong> procedures<\/li>\n<li>Postoperative follow-up after <strong>fusion<\/strong>, <strong>osteotomy<\/strong>, or complex reconstruction<\/li>\n<li>Evaluation of <strong>adjacent segment problems<\/strong> or junctional issues above\/below a fusion<\/li>\n<li>Complex cases where symptoms seem <strong>out of proportion<\/strong> to a single-level MRI finding<\/li>\n<li>Assessment of posture changes in people with <strong>hip\/knee flexion contractures<\/strong> or gait changes<\/li>\n<li>Monitoring alignment in certain <strong>neuromuscular<\/strong> or degenerative conditions (varies by clinician and case)<\/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 Global alignment is an evaluation concept rather than a single intervention, \u201ccontraindications\u201d usually mean situations where it may be less reliable, less relevant, or insufficient on its own:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Medical emergencies<\/strong> (e.g., suspected spinal cord compression, cauda equina syndrome): urgent neurologic evaluation takes priority over alignment analysis.<\/li>\n<li><strong>Non\u2013weight-bearing imaging only<\/strong>: alignment assessment is often most meaningful on standing, full-length images; supine imaging may not reflect functional posture.<\/li>\n<li><strong>Inability to stand safely<\/strong> for imaging due to severe pain, weakness, dizziness, or unstable medical conditions.<\/li>\n<li><strong>Acute trauma<\/strong> where immediate stabilization and injury characterization are the priority; alignment targets may be addressed later.<\/li>\n<li><strong>Isolated focal problems<\/strong> where global posture is not the main driver of symptoms (varies by clinician and case).<\/li>\n<li>Situations where posture is <strong>highly variable<\/strong> day to day (e.g., severe muscle spasm or fluctuating neurologic tone), which can make single-time measurements less representative.<\/li>\n<li>When clinicians need <strong>different information<\/strong> (for example, detailed nerve compression on MRI, or bone detail on CT) and global alignment metrics would not answer the main question.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">How it works (Mechanism \/ physiology)<\/h2>\n\n\n\n<p>Global alignment is based on biomechanics: the body tends to organize itself so that the <strong>head stays balanced over the pelvis and feet<\/strong>, allowing efficient standing and forward gaze. When spinal curves change, the body often adapts through compensations.<\/p>\n\n\n\n<p>Key anatomy involved includes:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\n<p><strong>Vertebrae and spinal curves<\/strong><br\/>\n  The spine has normal curves: cervical lordosis (neck), thoracic kyphosis (mid-back), and lumbar lordosis (low back). Changes in these curves can shift the trunk forward or backward.<\/p>\n<\/li>\n<li>\n<p><strong>Intervertebral discs and facet joints<\/strong><br\/>\n  Degeneration can reduce disc height, alter segmental angles, and contribute to stiffness or instability, influencing posture.<\/p>\n<\/li>\n<li>\n<p><strong>Pelvis and hips<\/strong><br\/>\n  The pelvis acts like the foundation for the spine. Pelvic orientation can rotate to compensate for spinal imbalance (often discussed as pelvic \u201ctilt\u201d in clinical measurement frameworks).<\/p>\n<\/li>\n<li>\n<p><strong>Muscles and ligaments<\/strong><br\/>\n  Paraspinal and hip muscles may work harder to keep the torso upright when alignment is off, contributing to fatigue and pain. Ligament tension and muscle recruitment patterns change with posture.<\/p>\n<\/li>\n<li>\n<p><strong>Neural elements (nerves and spinal cord)<\/strong><br\/>\n  Global alignment is not a direct measure of nerve compression, but alignment changes can coexist with stenosis or deformity that affects nerves.<\/p>\n<\/li>\n<\/ul>\n\n\n\n<p>Common physiologic\/biomechanical principles:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Center of mass and balance:<\/strong> If the torso shifts forward, more muscular effort may be needed to prevent falling forward.<\/li>\n<li><strong>Compensation chains:<\/strong> A reduction in lumbar lordosis, for example, may be \u201ccompensated\u201d by posterior pelvic rotation, knee flexion, or increased neck extension to keep the eyes level.<\/li>\n<li><strong>Load distribution:<\/strong> Malalignment can change how forces are distributed across discs, facets, and adjacent segments, which may influence symptoms and degeneration patterns.<\/li>\n<\/ul>\n\n\n\n<p>Onset\/duration\/reversibility:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Global alignment can change <strong>immediately<\/strong> with posture, pain, or muscle activation, but it can also reflect <strong>long-term structural changes<\/strong> (degenerative deformity, fixed kyphosis, post-fusion alignment).  <\/li>\n<li>Some components are <strong>flexible<\/strong> (postural), while others are <strong>fixed<\/strong> (structural). The balance between flexible vs fixed varies by clinician and case.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Global alignment Procedure overview (How it\u2019s applied)<\/h2>\n\n\n\n<p>Global alignment is not a single procedure. It is a structured way to evaluate and monitor whole-body spinal balance. A typical clinical workflow looks like this:<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\n<p><strong>Evaluation \/ exam<\/strong><br\/>\n   A clinician reviews symptoms (pain, fatigue, walking tolerance), function, and medical history. The physical exam may include posture observation, gait assessment, range of motion, neurologic testing, and hip\/knee flexibility.<\/p>\n<\/li>\n<li>\n<p><strong>Imaging \/ diagnostics<\/strong><br\/>\n   Global alignment is commonly assessed with <strong>standing, full-length spine radiographs<\/strong>, often including the pelvis and sometimes the lower limbs. Some centers use low-dose full-body imaging systems when available (varies by facility). MRI or CT may be added to evaluate nerves, discs, bone, or prior hardware when relevant.<\/p>\n<\/li>\n<li>\n<p><strong>Measurements and interpretation<\/strong><br\/>\n   Clinicians may measure parameters that describe overall balance in the sagittal (side view) and coronal (front\/back view) planes. The specific measurements used vary by clinician and case.<\/p>\n<\/li>\n<li>\n<p><strong>Planning \/ goal setting<\/strong><br\/>\n   Findings are integrated with symptoms and diagnoses. In conservative care, alignment findings may help frame rehabilitation targets and functional expectations. In surgical planning, they may inform correction strategy, levels of fusion, and alignment goals.<\/p>\n<\/li>\n<li>\n<p><strong>Intervention or monitoring (when applicable)<\/strong><br\/>\n   Global alignment can be reassessed after key milestones: therapy progression, bracing changes, injections (for symptom mapping), or surgery.<\/p>\n<\/li>\n<li>\n<p><strong>Immediate checks and follow-up<\/strong><br\/>\n   Follow-up may include repeat standing imaging at intervals appropriate for the condition, along with functional assessment. Timing and frequency vary by clinician and case.<\/p>\n<\/li>\n<\/ol>\n\n\n\n<h2 class=\"wp-block-heading\">Types \/ variations<\/h2>\n\n\n\n<p>Global alignment can be described and assessed in several ways, depending on the clinical question:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Sagittal vs coronal alignment<\/strong><\/li>\n<li><em>Sagittal alignment<\/em> (side view) focuses on forward\/backward balance and spinal curves (lordosis\/kyphosis).<\/li>\n<li>\n<p><em>Coronal alignment<\/em> (front view) focuses on side-to-side balance, often relevant in scoliosis.<\/p>\n<\/li>\n<li>\n<p><strong>Static vs dynamic alignment<\/strong><\/p>\n<\/li>\n<li><em>Static<\/em> assessment uses standing images or posture snapshots.<\/li>\n<li>\n<p><em>Dynamic<\/em> assessment considers gait and movement patterns; this may involve clinical gait analysis or motion assessment (methods vary by facility).<\/p>\n<\/li>\n<li>\n<p><strong>Radiographic vs clinical (visual\/functional) alignment<\/strong><\/p>\n<\/li>\n<li><em>Radiographic<\/em> alignment uses measurable parameters on imaging.<\/li>\n<li>\n<p><em>Clinical<\/em> alignment includes what is seen on exam: head position, shoulder\/pelvic level, trunk shift, gait, and compensatory knee\/hip posture.<\/p>\n<\/li>\n<li>\n<p><strong>Regional vs whole-body frameworks<\/strong><\/p>\n<\/li>\n<li><em>Regional<\/em> focuses on a specific area (cervical, thoracic, lumbar) while still relating it to the overall picture.<\/li>\n<li>\n<p><em>Whole-body<\/em> approaches consider the interaction of spine with pelvis and lower extremities.<\/p>\n<\/li>\n<li>\n<p><strong>Cervical, thoracic, and lumbar emphasis<\/strong><\/p>\n<\/li>\n<li>In <strong>cervical<\/strong> cases, head position and the relationship between the neck and thoracic spine can be central.<\/li>\n<li>\n<p>In <strong>thoracolumbar<\/strong> deformity, lumbar lordosis and pelvic compensation commonly drive symptoms and function.<\/p>\n<\/li>\n<li>\n<p><strong>Conservative vs surgical use<\/strong><\/p>\n<\/li>\n<li>In conservative care, global alignment informs education, activity tolerance expectations, and rehab focus.<\/li>\n<li>In surgery, it supports deformity classification, correction planning, and postoperative alignment evaluation (specific targets vary by surgeon and case).<\/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>Provides a <strong>whole-body context<\/strong> for spine symptoms and posture<\/li>\n<li>Helps identify <strong>compensation patterns<\/strong> that may affect pain and function<\/li>\n<li>Supports <strong>consistent communication<\/strong> across clinicians using shared concepts<\/li>\n<li>Useful for <strong>surgical planning<\/strong> in complex deformity and reconstruction<\/li>\n<li>Enables <strong>tracking over time<\/strong> with repeat assessments<\/li>\n<li>Encourages attention to the <strong>pelvis\/hips\/knees<\/strong> rather than isolating the spine<\/li>\n<\/ul>\n\n\n\n<p>Cons:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Measurements can vary with <strong>posture, pain level, and effort<\/strong> during imaging<\/li>\n<li>Requires <strong>standing, full-length imaging<\/strong> for many assessments, which may not always be feasible<\/li>\n<li>Global alignment findings do not automatically explain <strong>nerve symptoms<\/strong>; MRI\/CT may still be needed<\/li>\n<li>Overemphasis on numbers can miss the patient\u2019s <strong>functional goals and symptom drivers<\/strong><\/li>\n<li>Interpretation can differ by <strong>training, measurement method, and clinical philosophy<\/strong><\/li>\n<li>Not all malalignment is symptomatic; relevance <strong>varies by clinician and case<\/strong><\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Aftercare &amp; longevity<\/h2>\n\n\n\n<p>Because Global alignment is primarily an assessment framework, \u201caftercare\u201d usually refers to what happens after a treatment plan is chosen (conservative or surgical) and how alignment is monitored over time.<\/p>\n\n\n\n<p>Factors that can influence outcomes and the durability of alignment-related results include:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\n<p><strong>Severity and flexibility of the underlying condition<\/strong><br\/>\n  Flexible postural issues may respond differently than rigid deformities or fused segments.<\/p>\n<\/li>\n<li>\n<p><strong>Bone quality and overall health<\/strong><br\/>\n  Bone density, nutrition status, and comorbidities can influence healing and structural durability, especially after surgery.<\/p>\n<\/li>\n<li>\n<p><strong>Muscle conditioning and endurance<\/strong><br\/>\n  Spinal and hip muscle endurance can affect how well a person maintains an upright posture during daily activity.<\/p>\n<\/li>\n<li>\n<p><strong>Adherence to follow-up and rehabilitation<\/strong><br\/>\n  Participation in prescribed rehabilitation and attendance at follow-up visits can affect functional recovery and monitoring accuracy.<\/p>\n<\/li>\n<li>\n<p><strong>Device\/technique considerations (when surgery is involved)<\/strong><br\/>\n  Hardware choice, fusion length, and correction strategy vary by surgeon and case and can influence long-term alignment maintenance.<\/p>\n<\/li>\n<li>\n<p><strong>Progression of degenerative change<\/strong><br\/>\n  Degeneration can continue at non-fused levels or in adjacent joints, potentially changing alignment over time.<\/p>\n<\/li>\n<li>\n<p><strong>Lifestyle and occupational demands<\/strong><br\/>\n  Work, activity patterns, and prolonged positions (sitting\/standing) can influence symptom experience and functional posture.<\/p>\n<\/li>\n<\/ul>\n\n\n\n<p>Monitoring is often periodic, especially when there is known deformity, prior reconstruction, or changing symptoms. The specifics vary by clinician and case.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Alternatives \/ comparisons<\/h2>\n\n\n\n<p>Global alignment is one way to understand spine-related problems, but it is not the only lens. Common alternatives or complementary approaches include:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\n<p><strong>Symptom-focused assessment (pain and neurologic findings)<\/strong><br\/>\n  This approach prioritizes symptom patterns, neurologic exam, and function. It can be efficient for focal issues but may miss broader balance problems in complex cases.<\/p>\n<\/li>\n<li>\n<p><strong>Segmental or regional imaging focus (e.g., \u201cone-level MRI\u201d approach)<\/strong><br\/>\n  MRI is excellent for discs, nerves, and stenosis. However, a limited-region MRI may not show how the entire spine and pelvis balance in standing.<\/p>\n<\/li>\n<li>\n<p><strong>Observation\/monitoring<\/strong><br\/>\n  In mild or stable conditions, clinicians may monitor symptoms and function over time. Global alignment measurements can support monitoring but may not be necessary in every case.<\/p>\n<\/li>\n<li>\n<p><strong>Physical therapy and rehabilitation approaches<\/strong><br\/>\n  Rehab may address mobility limits, strength\/endurance, gait, and movement habits. Global alignment concepts can help define functional goals, though therapy plans are individualized.<\/p>\n<\/li>\n<li>\n<p><strong>Medications<\/strong><br\/>\n  Medications may help manage pain and enable activity participation but do not directly change structural alignment.<\/p>\n<\/li>\n<li>\n<p><strong>Injections<\/strong><br\/>\n  Injections may be used to reduce inflammation or help clarify pain sources. They do not correct alignment, but symptom improvement may change posture temporarily.<\/p>\n<\/li>\n<li>\n<p><strong>Bracing (selected cases)<\/strong><br\/>\n  Bracing may be considered in certain deformities or pain patterns (more common in some pediatric scoliosis contexts and selected adult cases). Its role and expected effect vary by clinician and case.<\/p>\n<\/li>\n<li>\n<p><strong>Surgery vs conservative management<\/strong><br\/>\n  Surgery may be considered for specific indications (such as progressive deformity, significant imbalance, neurologic compromise, or persistent functional limitation despite conservative care). Conservative care may be preferred when symptoms are manageable, risks are high, or goals do not require structural correction.<\/p>\n<\/li>\n<\/ul>\n\n\n\n<p>Global alignment assessment often complements, rather than replaces, these approaches.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Global alignment Common questions (FAQ)<\/h2>\n\n\n\n<p><strong>Q: Does poor Global alignment always cause pain?<\/strong><br\/>\nNot necessarily. Some people have measurable malalignment but minimal symptoms, while others have significant pain and fatigue with smaller alignment changes. The relationship between alignment and symptoms varies by clinician and case.<\/p>\n\n\n\n<p><strong>Q: How do clinicians measure Global alignment?<\/strong><br\/>\nIt is commonly assessed using a physical exam plus standing, full-length radiographs that include the spine and pelvis. Clinicians may calculate measurements that describe overall balance and spinal curves. Methods and preferred parameters vary by clinician and case.<\/p>\n\n\n\n<p><strong>Q: Is Global alignment mainly about scoliosis?<\/strong><br\/>\nIt includes scoliosis (coronal plane) but also covers forward\/backward balance and spinal curves (sagittal plane), which are often central in adult degenerative deformity. Many posture and fatigue complaints relate to sagittal balance, even without major scoliosis.<\/p>\n\n\n\n<p><strong>Q: Does assessing Global alignment require anesthesia or sedation?<\/strong><br\/>\nNo. It is usually based on standing imaging and an exam. If additional tests are needed for other reasons (like MRI in claustrophobic patients), sedation policies depend on the facility and patient factors.<\/p>\n\n\n\n<p><strong>Q: How much does a Global alignment evaluation cost?<\/strong><br\/>\nCosts vary widely by region, facility type, insurance coverage, and what imaging is ordered. Full-length standing radiographs and specialist interpretation may be billed separately. For personal cost questions, clinics typically direct patients to preauthorization or billing teams.<\/p>\n\n\n\n<p><strong>Q: If my Global alignment is \u201coff,\u201d how long do results last after treatment?<\/strong><br\/>\nDurability depends on the cause. Postural and flexible issues may change with conditioning, pain levels, and habits, while structural deformities may progress over time. After surgery, alignment may be maintained long term, but adjacent changes can still occur; follow-up practices vary by clinician and case.<\/p>\n\n\n\n<p><strong>Q: Is it \u201csafe\u201d to get the imaging used to assess Global alignment?<\/strong><br\/>\nStandard radiographs use ionizing radiation, and clinicians typically aim to use the lowest practical dose and limit repeat imaging when possible. The risk-benefit balance depends on the clinical question, frequency of imaging, and patient factors. Imaging choices vary by clinician and case.<\/p>\n\n\n\n<p><strong>Q: Will I be able to drive or work the same day as an alignment evaluation?<\/strong><br\/>\nMany people can, because the evaluation is usually an exam and standing imaging. However, individual circumstances\u2014pain severity, dizziness, mobility limits, or additional testing\u2014can change this. Policies and recommendations vary by clinician and case.<\/p>\n\n\n\n<p><strong>Q: Does Global alignment tell whether I need surgery?<\/strong><br\/>\nIt helps inform the overall picture but does not, by itself, determine the need for surgery. Surgical decisions typically combine symptoms, function, neurologic findings, imaging of nerves and bones, overall health, and patient goals. Thresholds and decision-making vary by surgeon and case.<\/p>\n\n\n\n<p><strong>Q: Can physical therapy \u201cfix\u201d Global alignment?<\/strong><br\/>\nTherapy may improve functional posture, endurance, and movement efficiency, especially when alignment issues are flexible and influenced by muscle control or pain. Structural deformities or rigid curves may be less changeable without surgical correction. Expected changes vary by clinician and case.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Global alignment describes how the head, spine, pelvis, and legs line up as a whole when a person stands or moves. It is most commonly discussed in spine clinics when evaluating posture, spinal balance, and spinal deformity. It helps clinicians connect symptoms (like fatigue or back pain) with overall body mechanics. It is typically assessed with a physical exam and full-length standing imaging.<\/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-2578","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>Global alignment: 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\/global-alignment-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=\"Global alignment: Definition, Uses, and Clinical Overview - Best Spine Hospitals\" \/>\n<meta property=\"og:description\" content=\"Global alignment describes how the head, spine, pelvis, and legs line up as a whole when a person stands or moves. It is most commonly discussed in spine clinics when evaluating posture, spinal balance, and spinal deformity. It helps clinicians connect symptoms (like fatigue or back pain) with overall body mechanics. 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