The influence of fixed sagittal plane centers of rotation on motion segment mechanics and range of motion in the cervical spine

Kelly, Brian P.; Zufelt, Nephi A.; Sander, Elizabeth J; DiAngelo, Denis J.

doi:10.1016/j.jbiomech.2013.01.018

Cited by 9 publications

(5 citation statements)

References 22 publications

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“…Bryan cervical disc prosthesis provided variant COR locations due to its unconstrained design, which overlapped the preoperative COR distributions. [19][20][21][22][23] However, the in vivo effect of deviated COR on kinematics after cervical TDR remained unknown. They discovered that the areas containing the CORs for the intact and Bryan models were approximately the same.…”

mentioning

confidence: 99%

The Effect of Deviated Center of Rotation on Flexion-Extension Range of Motion After Single-Level Cervical Arthroplasty

Xiao¹,

Gong²,

Líu³

et al. 2014

Spine

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confidence: 99%

The Effect of Deviated Center of Rotation on Flexion-Extension Range of Motion After Single-Level Cervical Arthroplasty

Xiao¹,

Gong²,

Líu³

et al. 2014

Spine

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“…The study using finite element analysis demonstrated that the backward shift of COR-X could increase ROM of corresponding segments, whereas the forward shift would decrease ROM [18]. It was reported that the insufficient depth of prosthesis implantation and consequent forward shift of COR produced limited ROM of cervical and TDR segment [19,20]. In conclusion, posterior placement of COR was an important factor to preserve postoperative ROM and to further accomplish successful clinical outcome.…”

Section: Interpretation For Discrepant Center Of Rotation Shift From mentioning

confidence: 88%

The Feasibility of Optimal Surgical Result Prediction according to the Center of Rotation Shift after Multilevel Cervical Total Disc Replacement

Lee¹,

Lee

2020

Asian Spine J

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Study Design: Retrospective design/spine clinic and tertiary referral hospital.Purpose: This study investigated the association between shifted location of center of rotation (COR) and subsequent surgical outcomes and identified radiological parameters that corresponded to COR change after multilevel cervical total disc replacement (MCTDR).Overview of Literature: Cervical total disc replacement (TDR) maintains normal cervical kinematics after surgery. However, there is a paucity of literature analyzing the relationship between radiological shifts of COR and subsequent clinical success, especially when it comes to the issue of MCTDR switch.Methods: This study included 24 consecutive patients treated with MCTDR following the diagnosis of multilevel cervical disc herniation or stenosis. Numeric rating scale, range of motion (ROM) at both C2–7 segment and TDR implanted levels, and location of COR at TDR level were evaluated pre- and post-MCTDR. These parameters were compared between patients who experienced successful and unsuccessful pain relief.Results: The inherent CORs relatively at ventrocranial coordinates demonstrated significant migrations to dorsocaudal location, more prominent shifts for the successful group, after MCTDR switch. The unsuccessful group showed markedly reduced C2–7 ROM and reduced angular improvement at C2–7 segment and MCTDR level compared with the successful group. Postoperative C2–7 ROM was related to postoperative COR along the x-axis.Conclusions: Aside from ROM preservation at both C2–7 and TDR levels, COR restoration from ventrocranial location close to normal coordinates by posterior and inferior shifts was marked as a clinical success after MCTDR. The COR position along the x-axis after MCTDR was an important factor to determine maintenance of C2–7 ROM.

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“…In our subgroup analysis, a deviated COR was related with a decreased ROM. Previous studies found that if the simulated location of COR was close to the inherent location of 1 healthy functional spinal unit, the segmental ROM on the sagittal plane would be well preserved [ 23 , 24 ]. And in lumbar disc arthroplasty, patients with smaller deviated COR showed increased ROM, while larger deviated COR was related with decreased ROM.…”

Section: Discussionmentioning

confidence: 99%

Influence of the deviated center of rotation on the range of motion after cervical disc arthroplasty –an in vivo study with a minimum of 10-year follow-up

Shi

et al. 2023

BMC Musculoskelet Disord

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Background Short-term researches have studied the change of the center of rotation (COR) after the Bryan Cervical disc arthroplasty (CDA). But there is a lack of long-term studies focusing on the location of COR and its influence after surgery. Methods Clinical and radiographic materials of patients who received CDA were retrospectively reviewed. Written informed consents were obtained. Clinical outcome was accessed by Japanese Orthopaedic Association (JOA), Neck Disability Index (NDI), and Odom’s scale. Radiographic evaluation underwent before surgery, at early (3 months) follow-up and final (minimal 10 years) follow-up. The ROM of the global cervical spine and index level, the functional spine unit (FSU) angle and C2-C7 angle were measured. COR was identified and its coordinates were calculated. The absolute change of COR-x and COR-y were compared in subgroup analysis. Results Sixty patients were included, with an average age of 55.9 ± 8.1 years old. The mean duration of follow up was 135.1 ± 16.1 (120–155) months. JOA, NDI and Odom’s scale showed significant improvements at 10 years after surgery. The COR of index level was located in the posterior superior half of the caudal vertebral body. Following the implant of Bryan Disc, the COR shifted forward and downward. During the 10-year follow-up, the location of COR remained stable. ROM at the index level decreased from 10.6 ± 4.0° preoperatively to 9.3 ± 4.0° at the early follow-up (p = 0.03). The ROM at the index level remained unchanged from early follow-up to the final follow-up (9.3 ± 4.0° vs 9.5 ± 5.2°, p = 0.80). In subgroup analysis, larger changes of both COR-x and COR-y were related with decreased ROM. Conclusions Our study illustrated that Bryan CDA could achieved favorable clinical and radiographic outcome over a minimal 10-year follow-up. The reduction of the flexion-extension ROM may be correlated with a more deviated postoperative COR. More attention should be paid to preoperative design and intraoperative technique to obtain a more native COR.

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The influence of fixed sagittal plane centers of rotation on motion segment mechanics and range of motion in the cervical spine

Cited by 9 publications

References 22 publications

The Effect of Deviated Center of Rotation on Flexion-Extension Range of Motion After Single-Level Cervical Arthroplasty

The Effect of Deviated Center of Rotation on Flexion-Extension Range of Motion After Single-Level Cervical Arthroplasty

The Feasibility of Optimal Surgical Result Prediction according to the Center of Rotation Shift after Multilevel Cervical Total Disc Replacement

Influence of the deviated center of rotation on the range of motion after cervical disc arthroplasty –an in vivo study with a minimum of 10-year follow-up

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