{"id":8091,"date":"2026-01-29T14:12:37","date_gmt":"2026-01-29T13:12:37","guid":{"rendered":"https:\/\/blueportance.com\/knowledge-base\/structural-vs-functional\/"},"modified":"2026-10-25T22:43:32","modified_gmt":"2026-10-25T21:43:32","slug":"structural-vs-functional","status":"publish","type":"page","link":"https:\/\/blueportance.com\/en\/knowledge-base\/structural-vs-functional\/","title":{"rendered":"KB_coccydynia_04: Structural or Functional"},"content":{"rendered":"\n\n<!-- BDC \u2014 Coccydynia \u2014 Page 4_Structural or functional: the question that changes everything \u2014 Blue Portance -->\n\n<style>\n.bp-bdc-breadcrumb{\n  max-width: 900px;\n  margin: 0 auto;\n  padding: 20px 16px 0;\n  font-size: .85rem;\n  color: #6b7280;\n}\n.bp-bdc-breadcrumb a{\n  color: #2a7fba;\n  text-decoration: none;\n}\n.bp-bdc-breadcrumb a:hover{\n  text-decoration: underline;\n}\n<\/style>\n\n<nav class=\"bp-bdc-breadcrumb\" aria-label=\"Breadcrumb\">\n<a href=\"\/en\/\">Blue Portance<\/a> \u2192 <a href=\"https:\/\/blueportance.com\/en\/knowledge-base\/\">Knowledge Base<\/a> \u2192 <a href=\"https:\/\/blueportance.com\/en\/knowledge-base\/expert-guides\/sitting-related-pain\/\">Sitting-Related Pain<\/a> \u2192 <a href=\"https:\/\/blueportance.com\/en\/knowledge-base\/expert-guides\/sitting-related-pain\/coccydynia\/\">Coccydynia<\/a> \u2192 Structural or Functional\n<\/nav>\n\n<section class=\"bp-bdc-wrap\">\n\n<!-- HERO -->\n<header class=\"bp-bdc-hero\">\n<h1>4. Structural or Functional: The Question That Changes Everything<\/h1>\n<p>Knowledge Base &#8211; Coccydynia Expert Guide<\/p>\n<div class=\"bp-bdc-meta\">Blue Portance Knowledge Base \u00b7 Non-commercial reproduction permitted with citation of the source<\/div>\n<\/header>\n\n<nav class=\"bp-bdc-toc\" aria-label=\"Table of contents\">\n<h2>Table of Contents<\/h2>\n<ul>\n<li><a href=\"#intro\">1. The central question<\/a><\/li>\n<li><a href=\"#causes-structurelles\">2. Structural causes<\/a><\/li>\n<li><a href=\"#imagerie-normale\">3. When imaging is normal<\/a><\/li>\n<li><a href=\"#examen-clinique\">4. The key role of the clinical examination<\/a><\/li>\n<li><a href=\"#metaphore\">5. A structuring metaphor<\/a><\/li>\n<li><a href=\"#erreurs\">6. Why this distinction prevents so many errors<\/a><\/li>\n<li><a href=\"#references\">Scientific references<\/a><\/li>\n<\/ul>\n<\/nav>\n\n<article class=\"bp-bdc-content\">\n\n<h2 id=\"intro\">1. The central question<\/h2>\n\n<p>\nAt this stage, one question becomes central \u2014 and it determines absolutely everything else:\n<\/p>\n\n<p><strong>why does this coccyx hurt?<\/strong><\/p>\n\n<p>Is it because it is <strong>structurally damaged<\/strong>?<\/p>\n<p>\nOr because it is <strong>functionally trapped<\/strong>\nin an environment that no longer allows it to play its role?\n<\/p>\n\n<p>\nThis distinction may seem theoretical.\nIn reality it is <strong>fundamental<\/strong>, because it determines:\n<\/p>\n\n<ul>\n<li>which examinations are useful,<\/li>\n<li>the logic of care,<\/li>\n<li>\nand above all, the reasons why some treatments fail\nwhile others work.\n<\/li>\n<\/ul>\n\n<h2 id=\"causes-structurelles\">2. Structural causes: when the bone is involved<\/h2>\n\n<p>\nIn some cases of coccydynia, the pain is linked to an\n<strong>objectifiable abnormality of the coccyx itself<\/strong>.\n<\/p>\n\n<p>The main findings are:<\/p>\n\n<ul>\n<li>an <strong>anterior or posterior dislocation<\/strong> (Postacchini &amp; Massobrio, 1983; Maigne et al., 2000),<\/li>\n<li><strong>excessive hypermobility<\/strong> (Maigne &amp; Tamalet, 1996; Lirette et al., 2014),<\/li>\n<li>more rarely, a <strong>coccygeal spur (spicule)<\/strong> (Fogel et al., 2004; Lirette et al., 2014).<\/li>\n<\/ul>\n\n<p>\nThese abnormalities share an essential feature:\n<\/p>\n\n<p>\nthey are <strong>often invisible<\/strong> on a standard radiograph\ntaken standing or lying down.\n<\/p>\n\n<p>\nIt is precisely this observation that led Maigne and Tamalet\nto develop a <strong>dynamic sitting\/standing radiograph protocol<\/strong>,\nnow considered the reference examination for investigating\ncoccydynia (Maigne &amp; Tamalet, 1996).\n<\/p>\n\n<p>\nWhat this dynamic imaging shows is not only the shape of the coccyx,\nbut <strong>its behavior under load<\/strong> (Maigne &amp; Tamalet, 1996; Lirette et al., 2014).\n<\/p>\n\n<p>A coccyx can look perfectly normal at rest\u2026<\/p>\n<p>\nYet it can dislocate, shift, or become hypermobile as soon as the person sits down (Maigne &amp; Tamalet, 1996).\n<\/p>\n\n<p>\nThis is often the moment when the diagnosis shifts:\n<\/p>\n\n<p>\nthe pain is no longer \u201cunexplained\u201d; it becomes\n<strong>mechanically coherent<\/strong>.\n<\/p>\n\n<h2 id=\"imagerie-normale\">3. When imaging is normal\u2026 but the pain is very real<\/h2>\n\n<p>\nHowever, in a significant number of cases, imaging examinations \u2014 even dynamic ones \u2014\nreveal <strong>no obvious structural abnormality<\/strong> (Fogel et al., 2004; Lirette et al., 2014).\n<\/p>\n\n<p>And yet, the pain is there.<\/p>\n<p><strong>Intense. Disabling.<\/strong><\/p>\n\n<p>\nThis is where the notion of\n<strong>functional coccydynia<\/strong> comes in (Fogel et al., 2004).\n<\/p>\n\n<p>\nIn these situations, the coccyx is not damaged,\nbut it is <strong>trapped in an environment that has lost its capacity to adapt<\/strong>:\n<\/p>\n\n<ul>\n<li>pelvic floor hypertonia (Vodusek, 2004),<\/li>\n<li>chronic muscle tension (Fogel et al., 2004),<\/li>\n<li>loss of overall pelvic mobility,<\/li>\n<li>repeated postural stress.<\/li>\n<\/ul>\n\n<h3>A muscular environment that traps the coccyx<\/h3>\n\n<p>\nThe coccyx then becomes the <strong>fixation point<\/strong> of a broader imbalance.\n<\/p>\n\n<p>In reality, it is not the bone that is diseased;<\/p>\n<p>it is the system around it that can no longer absorb the stress.<\/p>\n\n<blockquote>\nIf imaging remains silent, the key often lies in the dynamics\nof the soft tissues that act as \u201cguy wires\u201d for the coccyx.\n<\/blockquote>\n\n<p>\nIn some patients, functional coccydynia may reflect\n<strong>pelvic floor hypertonia<\/strong>.\n<\/p>\n\n<p>\nThe levator ani and the coccygeus muscle attach directly\nto the lateral borders of the coccyx (Vodusek, 2004).\n<\/p>\n\n<p>\nUnder chronic stress, or as a protective reflex after an impact,\nthese muscles can enter a cycle of permanent contracture (Fogel et al., 2004).\n<\/p>\n\n<p>\nIn some patients, the coccyx is then \u201cpinned\u201d by these overly tight muscular guy wires,\nlosing its ability to tilt when moving into the seated position (Fogel et al., 2004).\n<\/p>\n\n<p>\nAs a result, during the clinical examination, reproducing the pain by putting these muscles\nunder tension supports the hypothesis that the coccyx is being mechanically stressed by an overly rigid\nmyofascial environment (Fogel et al., 2004).\n<\/p>\n\n<p>\nThis mechanism explains why some people show no abnormality\non Maigne\u2019s dynamic radiographs,\nyet suffer from a real mechanical stress imposed\nby their own musculature (Maigne &amp; Tamalet, 1996; Fogel et al., 2004).\n<\/p>\n\n<h3 id=\"figure-5\"> Figure 5 \u2014 The pelvic muscular sling and the coccyx<\/h3>\n<figure class=\"bp-figure\">\n<img decoding=\"async\" src=\"https:\/\/blueportance.com\/wp-content\/uploads\/Pelvic-muscular-sling-and-the-coccyx.png\"\nalt=\"Functional anatomy and mobility of the coccyx: coccygeal segments, muscle attachments, tensioning of the coccyx, and reduced mobility\">\n<\/figure>\n\n<p>\n<strong>Caption:<\/strong>\nIn short, this figure shows how the attachment of the levator muscles to the borders of the coccyx creates tension\nthat can \u201cimprison\u201d it and block its physiological mobility (Vodusek, 2004; Fogel et al., 2004).\n<\/p>\n\n<h2 id=\"examen-clinique\">4. The key role of the clinical examination<\/h2>\n\n<p>\nIt is in these functional forms that the clinical examination takes on its full value.\n<\/p>\n\n<p>Palpation makes it possible to:<\/p>\n\n<ul>\n<li>reproduce the pain,<\/li>\n<li>assess the mobility of the coccyx,<\/li>\n<li>identify areas of muscle tension,<\/li>\n<li>detect protective reactions of the pelvic floor.<\/li>\n<\/ul>\n\n<p>\nA coccyx that is painful on palpation, without any radiological abnormality,\nis not a \u201cfalse problem.\u201d\n<\/p>\n\n<p>\nIt often reflects <strong>local hypersensitization<\/strong>\nor an indirect mechanical stress (Fogel et al., 2004).\n<\/p>\n\n<p><strong> Here again, the pain makes sense.<\/strong><\/p>\n\n<p>\nIt points instead to a <strong>loss of functional freedom<\/strong>,\nnot a visible lesion.\n<\/p>\n\n<div class=\"bp-bdc-box bp-bdc-box--soft\">\n<strong>Doctrinal box \u2014 A structuring reading<\/strong>\n<p>\nThe \u201cstructural vs functional\u201d distinction does not set \u201creal\u201d pain against \u201cimaginary\u201d pain.\nIt contrasts an objectifiable bony lesion or instability with an indirect mechanical stress produced\nby the myofascial environment and postural dynamics.\n<\/p>\n<p>\nWhen imaging is normal, the functional hypothesis becomes central: it requires looking for what\nacts as a \u201cguy wire\u201d on the coccyx (pelvic floor, tension, loss of mobility) and for what prevents the system from absorbing\nstress in the seated position (Vodusek, 2004; Fogel et al., 2004).\n<\/p>\n<p>\nIn other words: the bone may be intact, but the system around it may have become too rigid to remain\ncompatible with the load of sitting (Maigne &amp; Tamalet, 1996; Lirette et al., 2014).\n<\/p>\n<\/div>\n\n<h2 id=\"metaphore\">5. A structuring metaphor: a healthy part in a seized mechanism<\/h2><br>\n\n<p>\nThis situation can be compared to a perfectly intact mechanical part \u2026 built into a seized-up system.\n<\/p>\n\n<ul>\n<li>The part (the coccyx) is healthy.<\/li>\n<li>The axes around it (muscles, ligaments, posture) are rigid.<\/li>\n<li>Overall movement becomes constrained.<\/li>\n<li>Stress concentrates on the most exposed point.<\/li>\n<\/ul>\n\n<p>\nThe pain is not proof of an intrinsic fragility.\n<\/p>\n\n<p>\nIt is the signal of an imbalance in how stress is distributed.\n<\/p>\n\n<h2 id=\"erreurs\">6. Why this distinction prevents so many errors<\/h2>\n\n<p>\nFailing to distinguish structural from functional leads to two frequent dead ends:\n<\/p>\n\n<ul>\n<li>searching endlessly for a visible lesion that does not exist,<\/li>\n<li>\nor, conversely, treating a very real mechanical instability \u201cfunctionally.\u201d\n<\/li>\n<\/ul>\n\n<p>\nIn both cases, the person becomes exhausted, starts to doubt,\nand ends up believing the pain is \u201call in their head.\u201d\n<\/p>\n\n<p>\nYet, whether structural or functional,\n<strong>coccydynia is never imaginary<\/strong>.\n<\/p>\n\n<p>\nIt is always the expression of a system that can no longer adapt.\n<\/p>\n\n<figure class=\"bp-figure\">\n<img decoding=\"async\" src=\"https:\/\/blueportance.com\/wp-content\/uploads\/Coccyx_Structural-lesion-vs-functional-pain.png\"\nalt=\"Comparison between structural and functional coccydynia: objectifiable mechanical abnormality versus myofascial stress without visible bony lesion\">\n\n<figcaption>\n<strong>Caption:<\/strong>\nIn sum, this figure illustrates two configurations of coccydynia:\n(1) a <strong>structural<\/strong> form, in which the coccygeal axis shows an\n<strong>objectifiable mechanical abnormality<\/strong> (instability, hypermobility, or displacement under load);\n(2) a <strong>functional<\/strong> form, in which the bone may be <strong>intact<\/strong>,\nbut the pain results from an <strong>indirect stress<\/strong> linked to myofascial stiffening,\nprotective hypertonia, and the loss of adaptive capacity of the pelvis and pelvic floor\n(Fogel et al., 2004; Vodusek, 2004).\n<br><br>\n<strong>Purpose:<\/strong>\nto show why static imaging can be normal while pain that is\nmechanically coherent persists, and why the clinical examination and functional reading remain decisive\n(Maigne &amp; Tamalet, 1996).\n<\/figcaption>\n<\/figure>\n\n<!-- REFERENCES -->\n<section id=\"references\">\n<div class=\"bp-box bp-box--info\">\n<h2>Scientific references<\/h2>\n<ol>\n<li>\nMaigne, J. Y., &amp; Tamalet, B. (1996).\n<em>Standardized radiologic protocol for the study of common coccygodynia and characteristics of the lesions observed in the sitting position.<\/em>\nSpine, 21(22), 2588\u20132593.\n<\/li>\n<li>\nFogel, G. R., Cunningham, P. Y., &amp; Esses, S. I. (2004).\n<em>Coccygodynia: Evaluation and management.<\/em>\nJournal of the American Academy of Orthopaedic Surgeons, 12(1), 49\u201354.\n<\/li>\n<li>\nVodu\u0161ek, D. B. (2004).\n<em>Anatomy and neurocontrol of the pelvic floor.<\/em>\nDigestion, 69(2), 87\u201392.\n<\/li>\n<li>\nPostacchini, F., &amp; Massobrio, M. (1983).\n<em>Idiopathic coccygodynia.<\/em>\nJournal of Bone and Joint Surgery, 65(8), 1116\u20131124.\n<\/li>\n<li>\nMaigne, J. Y., Doursounian, L., &amp; Chatellier, G. (2000).\n<em>Causes and mechanisms of common coccydynia: role of body mass index and coccygeal trauma.<\/em>\nSpine, 25(23), 3072\u20133079.\n<\/li>\n<li>\nLirette, L. S., Chaiban, G., Tolba, R., &amp; Eissa, H. (2014).\n<em>Coccydynia: An overview of the anatomy, etiology, and treatment of coccyx pain.<\/em>\nOchsner Journal, 14(1), 84\u201387.\n<\/li>\n<\/ol>\n<\/div>\n<\/section>\n\n<!-- NAVIGATION -->\n<nav class=\"bp-bdc-box bp-bdc-navigation\" aria-label=\"Thematic navigation\">\n<strong>Navigation<\/strong>\n\n<p>\n<a href=\"https:\/\/blueportance.com\/en\/knowledge-base\/expert-guides\/sitting-related-pain\/coccydynia\/\">\n\u2190 Back to the Coccydynia hub\n<\/a>\n<\/p>\n\n<p>\n<a href=\"https:\/\/blueportance.com\/en\/knowledge-base\/expert-guides\/sitting-related-pain\/\">\n\u2190 See the topic: Sitting-Related Pain\n<\/a>\n<\/p>\n\n<p>\n<a href=\"https:\/\/blueportance.com\/en\/knowledge-base\/\">\n\u2190 Explore the Knowledge Base\n<\/a>\n<\/p>\n<\/nav>\n\n<!-- NOTE \/ DISCLAIMER -->\n<footer class=\"bp-bdc-footer\">\n<strong>Note<\/strong>: this content aims to explain mechanisms.\nIt does not constitute a medical diagnosis or a therapeutic prescription.\n<\/footer>\n\n<p class=\"bp-bdc-copyright\" style=\"font-size:.85em;color:#6b7280;margin-top:16px;\">\n\u00a9 Gil Ayache. The concepts, diagrams, terminology, and principles presented on this page constitute a work\nprotected by copyright. They are made available to Blue Portance under an intellectual property\nlicense agreement, without transfer of economic rights or of authorship.\n<\/p>\n\n<\/article>\n\n<\/section>\n\n\n\n","protected":false},"excerpt":{"rendered":"<p>Blue Portance \u2192 Knowledge Base \u2192 Sitting-Related Pain \u2192 Coccydynia \u2192 Structural or Functional 4. Structural or Functional: The Question That Changes Everything Knowledge Base &#8211; Coccydynia Expert Guide Blue Portance Knowledge Base \u00b7 Non-commercial reproduction permitted with citation of the source Table of Contents 1. The central question 2. Structural causes 3. 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