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Article: Effects of short anterior lumbar interbody fusion on biomechanics of neighboring unfused segments

TitleEffects of short anterior lumbar interbody fusion on biomechanics of neighboring unfused segments
Authors
Keywordsbiomechanical study
interbody fusion
kinematics
neighboring segments
Issue Date1996
PublisherLippincott, Williams & Wilkins. The Journal's web site is located at http://www.spinejournal.com
Citation
Spine, 1996, v. 21 n. 5, p. 549-555 How to Cite?
AbstractStudy Design. Segmental mobility and intradiscal pressure were measured and the data compared in six cadaveric lumber spine specimens before and after in vitro simulated single level L4-5 and double level L4-5-S1 anterior interbody fusions. Objective. The experimental objective was to study the biomechanical effects of single level L4-5 and double level L4-5-S1 anterior interbody fusions on the neighboring unfused segments. Summary of Background Data. The relationship between the local rigidity created by fusion mass and accelerated degeneration reported at the neighboring unfused intervertebral discs is not clear. Methods. Six cadaveric lumbar spine specimens were biomechanically tested in flexion and extension. Segmental mobility and intradiscal pressure of the specimens were measured before and after in vitro simulation of single level L4-5 and double level L4-5-S1 anterior interbody fusions. Results. The mobility of the motion segments immediately above end below an L4-5 fusion was increased in flexion. When the L5-S1 segment was also fused, the loss of segmental motion in both flexion and extension at the L4-5 and L5-S1 were compensated for by increased motion in all levels above the fusion. In both flexion and extension, the intradiacal pressures of all unfused intervertebral discs were increased after a single level L4-5 fusion and this increase was even more marked after a double level L4-5-S1 fusion. Conclusions. There is no evidence that the neighboring unfused segments are loaded beyond their physiological limits due to the fusion. However, the neighboring unfused segments have to work more frequently toward the extremes of their functional ranges of motion after fusion and these effects will be more marked after a double level L4-5-S1 fusion.
Persistent Identifierhttp://hdl.handle.net/10722/79418
ISSN
2015 Impact Factor: 2.439
2015 SCImago Journal Rankings: 1.459
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorChow, DHKen_HK
dc.contributor.authorLuk, KDKen_HK
dc.contributor.authorEvans, JHen_HK
dc.contributor.authorLeong, JCYen_HK
dc.date.accessioned2010-09-06T07:54:28Z-
dc.date.available2010-09-06T07:54:28Z-
dc.date.issued1996en_HK
dc.identifier.citationSpine, 1996, v. 21 n. 5, p. 549-555en_HK
dc.identifier.issn0362-2436en_HK
dc.identifier.urihttp://hdl.handle.net/10722/79418-
dc.description.abstractStudy Design. Segmental mobility and intradiscal pressure were measured and the data compared in six cadaveric lumber spine specimens before and after in vitro simulated single level L4-5 and double level L4-5-S1 anterior interbody fusions. Objective. The experimental objective was to study the biomechanical effects of single level L4-5 and double level L4-5-S1 anterior interbody fusions on the neighboring unfused segments. Summary of Background Data. The relationship between the local rigidity created by fusion mass and accelerated degeneration reported at the neighboring unfused intervertebral discs is not clear. Methods. Six cadaveric lumbar spine specimens were biomechanically tested in flexion and extension. Segmental mobility and intradiscal pressure of the specimens were measured before and after in vitro simulation of single level L4-5 and double level L4-5-S1 anterior interbody fusions. Results. The mobility of the motion segments immediately above end below an L4-5 fusion was increased in flexion. When the L5-S1 segment was also fused, the loss of segmental motion in both flexion and extension at the L4-5 and L5-S1 were compensated for by increased motion in all levels above the fusion. In both flexion and extension, the intradiacal pressures of all unfused intervertebral discs were increased after a single level L4-5 fusion and this increase was even more marked after a double level L4-5-S1 fusion. Conclusions. There is no evidence that the neighboring unfused segments are loaded beyond their physiological limits due to the fusion. However, the neighboring unfused segments have to work more frequently toward the extremes of their functional ranges of motion after fusion and these effects will be more marked after a double level L4-5-S1 fusion.en_HK
dc.languageengen_HK
dc.publisherLippincott, Williams & Wilkins. The Journal's web site is located at http://www.spinejournal.comen_HK
dc.relation.ispartofSpineen_HK
dc.subjectbiomechanical studyen_HK
dc.subjectinterbody fusionen_HK
dc.subjectkinematicsen_HK
dc.subjectneighboring segmentsen_HK
dc.titleEffects of short anterior lumbar interbody fusion on biomechanics of neighboring unfused segmentsen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0887-9869&volume=21 No5&spage=549&epage=555&date=1996&atitle=Effects+of+short+anterior+lumbar+interbody+fusion+on+biomechanics+of+neighboring+unfused+segmentsen_HK
dc.identifier.emailLuk, KDK:hcm21000@hku.hken_HK
dc.identifier.authorityLuk, KDK=rp00333en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1097/00007632-199603010-00004en_HK
dc.identifier.pmid8852308-
dc.identifier.scopuseid_2-s2.0-0029993668en_HK
dc.identifier.hkuros10886en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-0029993668&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume21en_HK
dc.identifier.issue5en_HK
dc.identifier.spage549en_HK
dc.identifier.epage555en_HK
dc.identifier.isiWOS:A1996TY80000004-
dc.publisher.placeUnited Statesen_HK
dc.identifier.scopusauthoridChow, DHK=7103203940en_HK
dc.identifier.scopusauthoridLuk, KDK=7201921573en_HK
dc.identifier.scopusauthoridEvans, JH=7407663944en_HK
dc.identifier.scopusauthoridLeong, JCY=35560782200en_HK

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