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* On MRI scans of IS patients, it seen that the length of the spinal cord is shorter in relation to the vertebral column and there is an increased prevalence of cerebellar tonsillar ectopia as well as an uncoordinated growth of the vertebral bodies in relation to the dorsal elements.<ref name="pmid16395162">{{cite journal| author=Chu WC, Lam WW, Chan YL, Ng BK, Lam TP, Lee KM et al.| title=Relative shortening and functional tethering of spinal cord in adolescent idiopathic scoliosis?: study with multiplanar reformat magnetic resonance imaging and somatosensory evoked potential. | journal=Spine (Phila Pa 1976) | year= 2006 | volume= 31 | issue= 1 | pages= E19-25 | pmid=16395162 | doi= | pmc= | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=16395162 }} </ref><ref name="pmid19909551">{{cite journal| author=Abul-Kasim K, Overgaard A, Karlsson MK, Ohlin A| title=Tonsillar ectopia in idiopathic scoliosis: does it play a role in the pathogenesis and prognosis or is it only an incidental finding? | journal=Scoliosis | year= 2009 | volume= 4 | issue= | pages= 25 | pmid=19909551 | doi=10.1186/1748-7161-4-25 | pmc=2780387 | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=19909551 }} </ref><ref name="pmid14516040">{{cite journal| author=Guo X, Chau WW, Chan YL, Cheng JC| title=Relative anterior spinal overgrowth in adolescent idiopathic scoliosis. Results of disproportionate endochondral-membranous bone growth. | journal=J Bone Joint Surg Br | year= 2003 | volume= 85 | issue= 7 | pages= 1026-31 | pmid=14516040 | doi= | pmc= | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=14516040 }} </ref> | * On MRI scans of IS patients, it seen that the length of the spinal cord is shorter in relation to the vertebral column and there is an increased prevalence of cerebellar tonsillar ectopia as well as an uncoordinated growth of the vertebral bodies in relation to the dorsal elements.<ref name="pmid16395162">{{cite journal| author=Chu WC, Lam WW, Chan YL, Ng BK, Lam TP, Lee KM et al.| title=Relative shortening and functional tethering of spinal cord in adolescent idiopathic scoliosis?: study with multiplanar reformat magnetic resonance imaging and somatosensory evoked potential. | journal=Spine (Phila Pa 1976) | year= 2006 | volume= 31 | issue= 1 | pages= E19-25 | pmid=16395162 | doi= | pmc= | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=16395162 }} </ref><ref name="pmid19909551">{{cite journal| author=Abul-Kasim K, Overgaard A, Karlsson MK, Ohlin A| title=Tonsillar ectopia in idiopathic scoliosis: does it play a role in the pathogenesis and prognosis or is it only an incidental finding? | journal=Scoliosis | year= 2009 | volume= 4 | issue= | pages= 25 | pmid=19909551 | doi=10.1186/1748-7161-4-25 | pmc=2780387 | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=19909551 }} </ref><ref name="pmid14516040">{{cite journal| author=Guo X, Chau WW, Chan YL, Cheng JC| title=Relative anterior spinal overgrowth in adolescent idiopathic scoliosis. Results of disproportionate endochondral-membranous bone growth. | journal=J Bone Joint Surg Br | year= 2003 | volume= 85 | issue= 7 | pages= 1026-31 | pmid=14516040 | doi= | pmc= | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=14516040 }} </ref> | ||
*This has led to theories proposing a relative anterior spinal overgrowth (RASO) or an uncoupled neuro-osseus growth as a cause of IS.<ref name="pmid18588673">{{cite journal| author=Chu WC, Lam WM, Ng BK, Tze-Ping L, Lee KM, Guo X et al.| title=Relative shortening and functional tethering of spinal cord in adolescent scoliosis - Result of asynchronous neuro-osseous growth, summary of an electronic focus group debate of the IBSE. | journal=Scoliosis | year= 2008 | volume= 3 | issue= | pages= 8 | pmid=18588673 | doi=10.1186/1748-7161-3-8 | pmc=2474583 | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=18588673 }} </ref> | *This has led to theories proposing a relative anterior spinal overgrowth (RASO) or an uncoupled neuro-osseus growth as a cause of IS.<ref name="pmid18588673">{{cite journal| author=Chu WC, Lam WM, Ng BK, Tze-Ping L, Lee KM, Guo X et al.| title=Relative shortening and functional tethering of spinal cord in adolescent scoliosis - Result of asynchronous neuro-osseous growth, summary of an electronic focus group debate of the IBSE. | journal=Scoliosis | year= 2008 | volume= 3 | issue= | pages= 8 | pmid=18588673 | doi=10.1186/1748-7161-3-8 | pmc=2474583 | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=18588673 }} </ref> | ||
*The risk of curve progression in IS is related to skeletal immaturity. | |||
*It has also been shown that girls with adolescent IS are taller and have a higher growth velocity during puberty in comparison to healthy individuals.<ref name="pmid4002036">{{cite journal| author=Normelli H, Sevastik J, Ljung G, Aaro S, Jönsson-Söderström AM| title=Anthropometric data relating to normal and scoliotic Scandinavian girls. | journal=Spine (Phila Pa 1976) | year= 1985 | volume= 10 | issue= 2 | pages= 123-6 | pmid=4002036 | doi= | pmc= | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=4002036 }} </ref><ref name="pmid4837925">{{cite journal| author=Willner S| title=A study of growth in girls with adolescent idiopathic structural scoliosis. | journal=Clin Orthop Relat Res | year= 1974 | volume= | issue= 101 | pages= 129-35 | pmid=4837925 | doi= | pmc= | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=4837925 }} </ref><ref name="pmid22744490">{{cite journal| author=Chazono M, Soshi S, Kida Y, Hashimoto K, Inoue T, Nakamura Y et al.| title=Height velocity curves in female patients with idiopathic scoliosis. | journal=Stud Health Technol Inform | year= 2012 | volume= 176 | issue= | pages= 202-5 | pmid=22744490 | doi= | pmc= | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=22744490 }} </ref> | |||
Revision as of 18:04, 28 November 2018
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Scoliosis pathophysiology On the Web |
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Risk calculators and risk factors for Scoliosis pathophysiology |
Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1] Associate Editor(s)-in-Chief: Rohan A. Bhimani, M.B.B.S., D.N.B., M.Ch.[2]
Overview
The exact pathogenesis of scoliosis is not fully understood.It is thought that scoliosis is the result of nutritional, endocrine, or genetic factors.The observation that curve development and progression correlate with the period of rapid adolescent growth appears to support a biomechanical contribution. However, multiple theories exist that attempt to explain the process by which the development takes place, and while each makes sense from a biomechanical standpoint, it has been difficult to directly correlate these theories to the in vivo scoliotic spine.
OR
[Disease or malignancy name] arises from [cell name]s, which are [cell type] cells that are normally involved in [function of cells].
OR
The progression to [disease name] usually involves the [molecular pathway].
OR
The pathophysiology of [disease/malignancy] depends on the histological subtype.
Pathophysiology
- Idiopathic scoliosis(IS) is the most common form of spinal deformity seen in healthy children and adoloscent during growth.
- The pathophysiology of scoliosis in not clearly understood.
- Animal studies have shown that pinealectomies lead to development of scoliosis due to lack of melatonin.[1][2][3]
- Dysfunctional melatonin signal pathway involving MT2 receptors affecting osteoblast have been recommended.[4][5]
- Calmodulin, a calcium-binding receptor protein, controls contraction in platelets and muscles, and interacts with melatonin. Increased levels of calmodulin in platelets and a disproportionate distribution of calmodulin in paraspinal muscles have been suggested in IS patients.[6][7][8]
- Vertebral bodies are seen wedged in the sagittal plane in IS patients, causing an apical lordosis in thoracic curvatures resulting in rotation of the spine and, secondarily, a lateral spinal curvature.
- On MRI scans of IS patients, it seen that the length of the spinal cord is shorter in relation to the vertebral column and there is an increased prevalence of cerebellar tonsillar ectopia as well as an uncoordinated growth of the vertebral bodies in relation to the dorsal elements.[9][10][11]
- This has led to theories proposing a relative anterior spinal overgrowth (RASO) or an uncoupled neuro-osseus growth as a cause of IS.[12]
- The risk of curve progression in IS is related to skeletal immaturity.
- It has also been shown that girls with adolescent IS are taller and have a higher growth velocity during puberty in comparison to healthy individuals.[13][14][15]
Genetics
In the case of the most common form of scoliosis, Adolescent Idiopathic Scoliosis, there is a clear Mendelian inheritance but with incomplete penetrance.
In April 2007, researchers at Texas Scottish Rite Hospital for Children identified the first gene associated with idiopathic scoliosis, CHD7. The medical breakthrough was the result of a 10-year study and is outlined in the May 2007 issue of the American Journal of Human Genetics.[16]
Associated conditions
Scoliosis is sometimes associated with other conditions such as
- Cerebral palsy
- Spinal muscular atrophy
- Familial dysautonomia
- CHARGE syndrome
- Friedreich's ataxia
- Spina bifida
- Marfan's syndrome
- Neurofibromatosis
- Connective tissue disorder
- Craniospinal axis disorders (e.g., syringomyelia, Arnold-Chiari malformation).
- Roussy-levy disease
- Charcot-marie-tooth disease
- Duchenne muscular dystrophy
- Limb girdle dystrophy
- Arthrogyposis
However, the majority of people with adolescent scoliosis have no pain or other abnormalities.
Pathophysiology
Pathogenesis
- The exact pathogenesis of [disease name] is not fully understood.
OR
- It is understood that [disease name] is the result of / is mediated by / is produced by / is caused by either [hypothesis 1], [hypothesis 2], or [hypothesis 3].
- [Pathogen name] is usually transmitted via the [transmission route] route to the human host.
- Following transmission/ingestion, the [pathogen] uses the [entry site] to invade the [cell name] cell.
- [Disease or malignancy name] arises from [cell name]s, which are [cell type] cells that are normally involved in [function of cells].
- The progression to [disease name] usually involves the [molecular pathway].
- The pathophysiology of [disease/malignancy] depends on the histological subtype.
Genetics
- [Disease name] is transmitted in [mode of genetic transmission] pattern.
- Genes involved in the pathogenesis of [disease name] include [gene1], [gene2], and [gene3].
- The development of [disease name] is the result of multiple genetic mutations.
Associated Conditions
Gross Pathology
- On gross pathology, [feature1], [feature2], and [feature3] are characteristic findings of [disease name].
Microscopic Pathology
- On microscopic histopathological analysis, [feature1], [feature2], and [feature3] are characteristic findings of [disease name].
References
- ↑ THILLARD MJ (1959). "[Vertebral column deformities following epiphysectomy in the chick]". C R Hebd Seances Acad Sci. 248 (8): 1238–40. PMID 13629950.
- ↑ Machida M, Murai I, Miyashita Y, Dubousset J, Yamada T, Kimura J (1999). "Pathogenesis of idiopathic scoliosis. Experimental study in rats". Spine (Phila Pa 1976). 24 (19): 1985–9. PMID 10528372.
- ↑ Machida M, Dubousset J, Imamura Y, Iwaya T, Yamada T, Kimura J (1995). "Role of melatonin deficiency in the development of scoliosis in pinealectomised chickens". J Bone Joint Surg Br. 77 (1): 134–8. PMID 7822371.
- ↑ Moreau A, Wang DS, Forget S, Azeddine B, Angeloni D, Fraschini F; et al. (2004). "Melatonin signaling dysfunction in adolescent idiopathic scoliosis". Spine (Phila Pa 1976). 29 (16): 1772–81. PMID 15303021.
- ↑ Wang WW, Man GC, Wong JH, Ng TB, Lee KM, Ng BK; et al. (2014). "Abnormal response of the proliferation and differentiation of growth plate chondrocytes to melatonin in adolescent idiopathic scoliosis". Int J Mol Sci. 15 (9): 17100–14. doi:10.3390/ijms150917100. PMC 4200781. PMID 25257530.
- ↑ Wu JZ, Wu WH, He LJ, Ke QF, Huang L, Dai ZS; et al. (2016). "Effect of Melatonin and Calmodulin in an Idiopathic Scoliosis Model". Biomed Res Int. 2016: 8460291. doi:10.1155/2016/8460291. PMC 5155075. PMID 28042574.
- ↑ Lowe T, Lawellin D, Smith D, Price C, Haher T, Merola A; et al. (2002). "Platelet calmodulin levels in adolescent idiopathic scoliosis: do the levels correlate with curve progression and severity?". Spine (Phila Pa 1976). 27 (7): 768–75. PMID 11923672.
- ↑ Acaroglu E, Akel I, Alanay A, Yazici M, Marcucio R (2009). "Comparison of the melatonin and calmodulin in paravertebral muscle and platelets of patients with or without adolescent idiopathic scoliosis". Spine (Phila Pa 1976). 34 (18): E659–63. doi:10.1097/BRS.0b013e3181a3c7a2. PMID 19680092.
- ↑ Chu WC, Lam WW, Chan YL, Ng BK, Lam TP, Lee KM; et al. (2006). "Relative shortening and functional tethering of spinal cord in adolescent idiopathic scoliosis?: study with multiplanar reformat magnetic resonance imaging and somatosensory evoked potential". Spine (Phila Pa 1976). 31 (1): E19–25. PMID 16395162.
- ↑ Abul-Kasim K, Overgaard A, Karlsson MK, Ohlin A (2009). "Tonsillar ectopia in idiopathic scoliosis: does it play a role in the pathogenesis and prognosis or is it only an incidental finding?". Scoliosis. 4: 25. doi:10.1186/1748-7161-4-25. PMC 2780387. PMID 19909551.
- ↑ Guo X, Chau WW, Chan YL, Cheng JC (2003). "Relative anterior spinal overgrowth in adolescent idiopathic scoliosis. Results of disproportionate endochondral-membranous bone growth". J Bone Joint Surg Br. 85 (7): 1026–31. PMID 14516040.
- ↑ Chu WC, Lam WM, Ng BK, Tze-Ping L, Lee KM, Guo X; et al. (2008). "Relative shortening and functional tethering of spinal cord in adolescent scoliosis - Result of asynchronous neuro-osseous growth, summary of an electronic focus group debate of the IBSE". Scoliosis. 3: 8. doi:10.1186/1748-7161-3-8. PMC 2474583. PMID 18588673.
- ↑ Normelli H, Sevastik J, Ljung G, Aaro S, Jönsson-Söderström AM (1985). "Anthropometric data relating to normal and scoliotic Scandinavian girls". Spine (Phila Pa 1976). 10 (2): 123–6. PMID 4002036.
- ↑ Willner S (1974). "A study of growth in girls with adolescent idiopathic structural scoliosis". Clin Orthop Relat Res (101): 129–35. PMID 4837925.
- ↑ Chazono M, Soshi S, Kida Y, Hashimoto K, Inoue T, Nakamura Y; et al. (2012). "Height velocity curves in female patients with idiopathic scoliosis". Stud Health Technol Inform. 176: 202–5. PMID 22744490.
- ↑ Texas Scottish Rite Hospital for Children Research: Scoliosis Research