Feasibility and Biomechanics of Multilevel Arthroplasty and Combined Cervical Arthrodesis and Arthroplasty
A new experimental protocol was applied utilizing a simplified postural control model. Multiple constructs were tested nondestructively by interconnecting segmental rods to screws. To investigate how posture and distribution of segmental angles under physiological loads are affected by combined cerv...
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| Veröffentlicht in: | Clinical spine surgery 2016-12, Vol.29 (10), p.E522-E531 |
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| creator | Safavi-Abbasi, Sam Reyes, Phillip M Abjornson, Celeste Crawford, Neil R |
| description | A new experimental protocol was applied utilizing a simplified postural control model. Multiple constructs were tested nondestructively by interconnecting segmental rods to screws.
To investigate how posture and distribution of segmental angles under physiological loads are affected by combined cervical arthroplasty and fusion.
Previous studies of biomechanics of multilevel arthroplasty have focused on range of motion and intradiscal pressure. No previous study has investigated postural changes and segmental angle distribution.
In 7 human cadaveric C3-T1 specimens, C4-C5, C5-C6, and C6-C7 disks were replaced with ProDisc-C (Synthes). Combinations of fusion (f) adjacent to arthroplasty (A) were simulated at C4-C5, C5-C6, and C6-C7, respectively: fAA, AfA, AAf, ffA, fAf, Aff, fff. C3-C4 and C7-T1 remained intact. A compressive belt apparatus simulated normal muscle cocontraction and gravitational preload; C3-C4, C4-C5, C5-C6, C6-C7, and C7-T1 motions were tracked independently. Parameters studied were segmental postural compensation, neutral buckling, and shift in sagittal plane instantaneous axis of rotation (IAR).
With one or more levels unfused, the arthroplasty levels preferentially moved toward upright posture before the intact levels. Neutral buckling was greatest for 3-level arthroplasty, less for 2-level arthroplasty, and least for 1-level arthroplasty. Among the three 1-level arthroplasty groups (ffA, fAf, Aff), arthroplasty at the caudalmost level resulted in significantly greater buckling than with arthroplasty rostralmost or at mid-segment (P |
| doi_str_mv | 10.1097/BSD.0b013e31829920f0 |
| format | Article |
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To investigate how posture and distribution of segmental angles under physiological loads are affected by combined cervical arthroplasty and fusion.
Previous studies of biomechanics of multilevel arthroplasty have focused on range of motion and intradiscal pressure. No previous study has investigated postural changes and segmental angle distribution.
In 7 human cadaveric C3-T1 specimens, C4-C5, C5-C6, and C6-C7 disks were replaced with ProDisc-C (Synthes). Combinations of fusion (f) adjacent to arthroplasty (A) were simulated at C4-C5, C5-C6, and C6-C7, respectively: fAA, AfA, AAf, ffA, fAf, Aff, fff. C3-C4 and C7-T1 remained intact. A compressive belt apparatus simulated normal muscle cocontraction and gravitational preload; C3-C4, C4-C5, C5-C6, C6-C7, and C7-T1 motions were tracked independently. Parameters studied were segmental postural compensation, neutral buckling, and shift in sagittal plane instantaneous axis of rotation (IAR).
With one or more levels unfused, the arthroplasty levels preferentially moved toward upright posture before the intact levels. Neutral buckling was greatest for 3-level arthroplasty, less for 2-level arthroplasty, and least for 1-level arthroplasty. Among the three 1-level arthroplasty groups (ffA, fAf, Aff), arthroplasty at the caudalmost level resulted in significantly greater buckling than with arthroplasty rostralmost or at mid-segment (P<0.04, analysis of variance/Holm-Sidak). Although IAR location was related to buckling, this correlation did not reach significance (P=0.112).
Arthroplasty levels provide the "path of least resistance," through which the initial motion is more likely to occur. The tendency for specimens to buckle under vertical compression became greater with more arthroplasty levels. Buckling appeared more severe with arthroplasty more caudal. Buckling only moderately correlated to shifts in IAR, meaning slight malpositioning of the devices would not necessarily cause buckling.</description><identifier>ISSN: 2380-0186</identifier><identifier>EISSN: 2380-0194</identifier><identifier>DOI: 10.1097/BSD.0b013e31829920f0</identifier><identifier>PMID: 23698102</identifier><language>eng</language><publisher>United States</publisher><subject>Aged ; Analysis of Variance ; Arthrodesis - instrumentation ; Arthrodesis - methods ; Arthroplasty - methods ; Biomechanical Phenomena ; Cervical Vertebrae - surgery ; Female ; Humans ; Male ; Middle Aged ; Range of Motion, Articular - physiology ; Spinal Fusion - instrumentation ; Spinal Fusion - methods</subject><ispartof>Clinical spine surgery, 2016-12, Vol.29 (10), p.E522-E531</ispartof><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c340t-49cb6909f63f1098df34003f27234b1d6d7f55ce7ce66c932ad4324b03e8393d3</citedby><cites>FETCH-LOGICAL-c340t-49cb6909f63f1098df34003f27234b1d6d7f55ce7ce66c932ad4324b03e8393d3</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>314,778,782,27907,27908</link.rule.ids><backlink>$$Uhttps://www.ncbi.nlm.nih.gov/pubmed/23698102$$D View this record in MEDLINE/PubMed$$Hfree_for_read</backlink></links><search><creatorcontrib>Safavi-Abbasi, Sam</creatorcontrib><creatorcontrib>Reyes, Phillip M</creatorcontrib><creatorcontrib>Abjornson, Celeste</creatorcontrib><creatorcontrib>Crawford, Neil R</creatorcontrib><title>Feasibility and Biomechanics of Multilevel Arthroplasty and Combined Cervical Arthrodesis and Arthroplasty</title><title>Clinical spine surgery</title><addtitle>Clin Spine Surg</addtitle><description>A new experimental protocol was applied utilizing a simplified postural control model. Multiple constructs were tested nondestructively by interconnecting segmental rods to screws.
To investigate how posture and distribution of segmental angles under physiological loads are affected by combined cervical arthroplasty and fusion.
Previous studies of biomechanics of multilevel arthroplasty have focused on range of motion and intradiscal pressure. No previous study has investigated postural changes and segmental angle distribution.
In 7 human cadaveric C3-T1 specimens, C4-C5, C5-C6, and C6-C7 disks were replaced with ProDisc-C (Synthes). Combinations of fusion (f) adjacent to arthroplasty (A) were simulated at C4-C5, C5-C6, and C6-C7, respectively: fAA, AfA, AAf, ffA, fAf, Aff, fff. C3-C4 and C7-T1 remained intact. A compressive belt apparatus simulated normal muscle cocontraction and gravitational preload; C3-C4, C4-C5, C5-C6, C6-C7, and C7-T1 motions were tracked independently. Parameters studied were segmental postural compensation, neutral buckling, and shift in sagittal plane instantaneous axis of rotation (IAR).
With one or more levels unfused, the arthroplasty levels preferentially moved toward upright posture before the intact levels. Neutral buckling was greatest for 3-level arthroplasty, less for 2-level arthroplasty, and least for 1-level arthroplasty. Among the three 1-level arthroplasty groups (ffA, fAf, Aff), arthroplasty at the caudalmost level resulted in significantly greater buckling than with arthroplasty rostralmost or at mid-segment (P<0.04, analysis of variance/Holm-Sidak). Although IAR location was related to buckling, this correlation did not reach significance (P=0.112).
Arthroplasty levels provide the "path of least resistance," through which the initial motion is more likely to occur. The tendency for specimens to buckle under vertical compression became greater with more arthroplasty levels. Buckling appeared more severe with arthroplasty more caudal. Buckling only moderately correlated to shifts in IAR, meaning slight malpositioning of the devices would not necessarily cause buckling.</description><subject>Aged</subject><subject>Analysis of Variance</subject><subject>Arthrodesis - instrumentation</subject><subject>Arthrodesis - methods</subject><subject>Arthroplasty - methods</subject><subject>Biomechanical Phenomena</subject><subject>Cervical Vertebrae - surgery</subject><subject>Female</subject><subject>Humans</subject><subject>Male</subject><subject>Middle Aged</subject><subject>Range of Motion, Articular - physiology</subject><subject>Spinal Fusion - instrumentation</subject><subject>Spinal Fusion - methods</subject><issn>2380-0186</issn><issn>2380-0194</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2016</creationdate><recordtype>article</recordtype><sourceid>EIF</sourceid><recordid>eNpdkE1PwzAMhiMEYtPYP0CoRy4dTtymzXEbDJCGOADnKk0dLVM_RtNN2r-nsA0hTras57Xlh7FrDhMOKrmbvd1PIAeOhDwVSgmwcMaGAlMIgavo_LdP5YCNvV8DAJeYcIwv2UCgVCkHMWTrBWnvcle6bh_oughmrqnIrHTtjA8aG7xsy86VtKMymLbdqm02pfZHdt5Uuaupb6jdOaNPSEHe-R_ib-SKXVhdehof64h9LB7e50_h8vXxeT5dhgYj6MJImVwqUFai7X9NC9uPAa1IBEY5L2SR2Dg2lBiS0igUuohQRDkgpaiwwBG7PezdtM3nlnyXVc4bKktdU7P1WS9MxhJRRj0aHVDTNt63ZLNN6yrd7jMO2bforBed_Rfdx26OF7Z5RcVv6KQVvwB3M3qI</recordid><startdate>20161201</startdate><enddate>20161201</enddate><creator>Safavi-Abbasi, Sam</creator><creator>Reyes, Phillip M</creator><creator>Abjornson, Celeste</creator><creator>Crawford, Neil R</creator><scope>CGR</scope><scope>CUY</scope><scope>CVF</scope><scope>ECM</scope><scope>EIF</scope><scope>NPM</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>7X8</scope></search><sort><creationdate>20161201</creationdate><title>Feasibility and Biomechanics of Multilevel Arthroplasty and Combined Cervical Arthrodesis and Arthroplasty</title><author>Safavi-Abbasi, Sam ; Reyes, Phillip M ; Abjornson, Celeste ; Crawford, Neil R</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c340t-49cb6909f63f1098df34003f27234b1d6d7f55ce7ce66c932ad4324b03e8393d3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2016</creationdate><topic>Aged</topic><topic>Analysis of Variance</topic><topic>Arthrodesis - instrumentation</topic><topic>Arthrodesis - methods</topic><topic>Arthroplasty - methods</topic><topic>Biomechanical Phenomena</topic><topic>Cervical Vertebrae - surgery</topic><topic>Female</topic><topic>Humans</topic><topic>Male</topic><topic>Middle Aged</topic><topic>Range of Motion, Articular - physiology</topic><topic>Spinal Fusion - instrumentation</topic><topic>Spinal Fusion - methods</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Safavi-Abbasi, Sam</creatorcontrib><creatorcontrib>Reyes, Phillip M</creatorcontrib><creatorcontrib>Abjornson, Celeste</creatorcontrib><creatorcontrib>Crawford, Neil R</creatorcontrib><collection>Medline</collection><collection>MEDLINE</collection><collection>MEDLINE (Ovid)</collection><collection>MEDLINE</collection><collection>MEDLINE</collection><collection>PubMed</collection><collection>CrossRef</collection><collection>MEDLINE - Academic</collection><jtitle>Clinical spine surgery</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Safavi-Abbasi, Sam</au><au>Reyes, Phillip M</au><au>Abjornson, Celeste</au><au>Crawford, Neil R</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Feasibility and Biomechanics of Multilevel Arthroplasty and Combined Cervical Arthrodesis and Arthroplasty</atitle><jtitle>Clinical spine surgery</jtitle><addtitle>Clin Spine Surg</addtitle><date>2016-12-01</date><risdate>2016</risdate><volume>29</volume><issue>10</issue><spage>E522</spage><epage>E531</epage><pages>E522-E531</pages><issn>2380-0186</issn><eissn>2380-0194</eissn><abstract>A new experimental protocol was applied utilizing a simplified postural control model. Multiple constructs were tested nondestructively by interconnecting segmental rods to screws.
To investigate how posture and distribution of segmental angles under physiological loads are affected by combined cervical arthroplasty and fusion.
Previous studies of biomechanics of multilevel arthroplasty have focused on range of motion and intradiscal pressure. No previous study has investigated postural changes and segmental angle distribution.
In 7 human cadaveric C3-T1 specimens, C4-C5, C5-C6, and C6-C7 disks were replaced with ProDisc-C (Synthes). Combinations of fusion (f) adjacent to arthroplasty (A) were simulated at C4-C5, C5-C6, and C6-C7, respectively: fAA, AfA, AAf, ffA, fAf, Aff, fff. C3-C4 and C7-T1 remained intact. A compressive belt apparatus simulated normal muscle cocontraction and gravitational preload; C3-C4, C4-C5, C5-C6, C6-C7, and C7-T1 motions were tracked independently. Parameters studied were segmental postural compensation, neutral buckling, and shift in sagittal plane instantaneous axis of rotation (IAR).
With one or more levels unfused, the arthroplasty levels preferentially moved toward upright posture before the intact levels. Neutral buckling was greatest for 3-level arthroplasty, less for 2-level arthroplasty, and least for 1-level arthroplasty. Among the three 1-level arthroplasty groups (ffA, fAf, Aff), arthroplasty at the caudalmost level resulted in significantly greater buckling than with arthroplasty rostralmost or at mid-segment (P<0.04, analysis of variance/Holm-Sidak). Although IAR location was related to buckling, this correlation did not reach significance (P=0.112).
Arthroplasty levels provide the "path of least resistance," through which the initial motion is more likely to occur. The tendency for specimens to buckle under vertical compression became greater with more arthroplasty levels. Buckling appeared more severe with arthroplasty more caudal. Buckling only moderately correlated to shifts in IAR, meaning slight malpositioning of the devices would not necessarily cause buckling.</abstract><cop>United States</cop><pmid>23698102</pmid><doi>10.1097/BSD.0b013e31829920f0</doi></addata></record> |
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| source | MEDLINE; Journals@Ovid Complete |
| subjects | Aged Analysis of Variance Arthrodesis - instrumentation Arthrodesis - methods Arthroplasty - methods Biomechanical Phenomena Cervical Vertebrae - surgery Female Humans Male Middle Aged Range of Motion, Articular - physiology Spinal Fusion - instrumentation Spinal Fusion - methods |
| title | Feasibility and Biomechanics of Multilevel Arthroplasty and Combined Cervical Arthrodesis and Arthroplasty |
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