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Multidirectional flexibility of the spine following posterior decompressive surgery after single-level cervical disc arthroplasty: an in vitro biomechanical investigation

STUDY DESIGN: In vitro human cadaveric biomechanical study. OBJECTIVE: This study quantifies the multidirectional flexibility of the spine following laminoplasty and laminectomy after cervical disc arthroplasty. SUMMARY OF BACKGROUND DATA: Posterior decompressive surgery may be used to treat recurrence of myeloradiculopathy following disc arthroplasty. This is the first study investigating the biomechanical effects of posterior decompressive surgery combined with cervical disc arthroplasty. METHODS: Seven human cervical spines were biomechanically evaluated under the following conditions: (1) intact; (2) discectomy (C5-C6); (3) disc arthroplasty (C5-C6); (4) arthroplasty + 3-level laminoplasty (C3-C5); (5) arthroplasty + 4-level laminoplasty (C3-C6); (6) arthroplasty + 5-level laminoplasty (C3-C7); (7) arthroplasty + 5-level laminoplasty (C3-C7) without hydroxyapatite spacers; and (8) arthroplasty + laminectomy (C3-C7). Multidirectional flexibility testing used unconstrained pure moments of +/-2 Nm for flexion-extension, axial rotation, and lateral bending. Quantification of C5-C6 and C3-C7 range of motion (ROM) and neutral zone (NZ) were normalized to the intact spine (100%). RESULTS: Flexion-extension loading of the discectomy condition demonstrated ROM of 22.05 degrees +/- 4.17 degrees at the operative level (P < 0.05). Implantation of the porous coated motion device restored segmental motion near the intact condition (ROM, 9.97 degrees +/- 6.44 degrees ; NZ, 5.82 degrees +/- 6.18 degrees ). There were no statistical differences between 3-level (13.79 degrees +/- 6.49 degrees ), 4-level (14.51 degrees +/- 5.76 degrees ), and 5-level (15.67 degrees +/- 5.71 degrees ) laminoplasty; however, additional levels demonstrated a trend toward increased motion at the arthroplasty level. Laminoplasty without spacers (17.45 degrees ) and laminectomy (18.27 degrees ) indicated even greater segmental motion (P > 0.05). Axial rotation and lateral bending indicated trends similar to those for flexion-extension. CONCLUSION: Posterior decompressive surgery increased ROM and NZ in all loading modes compared to arthroplasty alone, and laminectomy markedly increased motion compared with laminoplasty. Use of hydroxyapatite spacers and minimization of the extent of laminoplasty appear to be biomechanically favorable in this in vitro model

Keywords : Arthroplasty,Arthroplasty,Replacement,Biomechanical Phenomena,Cervical Vertebrae,Decompression,Surgical,Diskectomy,Humans,Intervertebral Disc,Laminectomy,methods,Motion,physiology,Range of Motion,Articular,Recurrence,Rotation,Spine,surgery,trends,, Flexibility,Spine,Following, pens london

Date of Publication : 2010 Dec 1

Authors : Kikkawa J;Cunningham BW;Shirado O;Hu N;McAfee PC;Oda H;

Organisation : Orthopaedic Spinal Research Laboratory, St Joseph Medical Center, Towson, MD 21204, USA

Journal of Publication : Spine (Phila Pa 1976 )

Pubmed Link : https://www.ncbi.nlm.nih.gov/pubmed/21102274

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Multidirectional flexibility of the spine following posterior decompressive surgery after single-level cervical disc arthroplasty an in vitro biomechanical investigation | Https//enwikipediaorg/wiki/intervertebral_disc_arthroplasty

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