우리들병원 이정환 원장 The Spine Journal논문 등재- Comparison of cervical kinematics between patients with cervical artificial disc replacement and anterior cervical discectomy and fusion for cervical disc herniation

Brief review
우리들병원 이정환 원장님이 The Spine Journal 최신호에 출판한 논문 입니다.

경추 디스크 탈출증이 있어 cervical artificial disc replacement혹은 anterior cervical discectomy and fusion을 받은 환자들을 대상으로 경추의 운동학적인 결과를 비교한 연구입니다.
임상적 결과로서 통증지수(VAS), 일상생활 장애지수(K-NDI)를 측정하였고, 운동학적인 결과분석을 위해 3차원 동작분석을 시행했습니다.

측정결과, VAS, NDI등의 임상결과는 두 군간에 유의한 차이가 없었습니다.
3D 동작분석 결과, cervical artificial disc replacement를 받은 환자군이 anterior cervical discectomy and fusion를 받은 환자군에 비해 굽힘, 편 상태에서 움직임의 범위가 통계적으로 유의하게 유지되었습니다.
아래 링크 들어가서 읽어보세요^^

*Title: Comparison of cervical kinematics between patients with cervical artificial disc replacement and anterior cervical discectomy and fusion for cervical disc herniation.

*Authors: Lee JH, Kim JS, Lee JH, Chung ER, Shim CS, Lee SH

*Bibliography: SpineJ. 2014 Jul 1;14(7):1199-204.

BACKGROUND CONTEXT

Although anterior cervical discectomy and fusion (ACDF) is an effective treatment option for patients with cervical disc herniation, it limits cervical range of motion, which sometimes causes discomfort and leads to biomechanical stress at neighboring segments.

In contrast, cervical artificial disc replacement (ADR) is supposed to preserve normal cervical range of motion than ACDF. A biomechanical measurement is necessary to identify the advantages and clinical implications of ADR.

However, literature is scarce about this topic and in those available studies, authors used the static radiological method, which cannot identify three-dimensional(3-D) motion and coupled movement during motion of one axis.

PURPOSE

-To compare the clinical parameters and cervical motion between ACDF and ADR (by 3-D motion analysis)
-To investigate the ability of ADR to maintain cervical kinematics.

STUDY DESIGN

Prospective case control study.


PATIENT SAMPLE
Patients who underwent ADR or ACDF for the treatment of single-level cervical disc herniation.

OUTCOME MEASURES

Visual analog scale (VAS)
Korean version of Neck Disability Index (NDI, %)
3-D motion analysis

METHODS

-Clinical outcomes: evaluated by VAS and the Korean version of the NDI (%) to assess pain degree and functional status.

-Cervical motions: assessed by 3-D motion analysis in terms of sagittal, coronal, and horizontal planes.
(Markers of 2.5 cm in diameter were attached at frontal polar (Fpz), center (Cz), and occipital (Oz) of 10-20 system of electroencephalography, C7 spinous process, and both acromions)

-These evaluations were performed preoperatively and 1 month and 6 months after surgery.

RESULTS
»Pre op: no significant difference in VAS, NDI (%), and cervical range of motion (between two groups)

»After surgery:

-no significant difference in VAS and NDI (%)

-In motion analysis, significantly more range of motion was retained in flexion and extension in the ADR group than the ACDF group at 1 month and 6 months.

There was no significant difference in lateral tilt and rotation angle. In terms of coupled motion, ADR group exhibited significantly more preserved sagittal plane motion during right and left rotation and also showed significantly more preserved right lateral bending angle during right rotation than ACDF group at 1 month and 6 months. There was no significant difference in other coupled motions.

 

CONCLUSION

-3-D motion analysis could provide useful information in an objective and quantitative way about cervical motion after surgery. In addition, it allowed us to measure not only main motion but also coupled motion in three planes.

-ADR demonstrated better retained cervical motion mainly in sagittal plane (flexion and extension) and better preserved coupled sagittal and coronal motion during transverse plane motion than ACDF.

-ADR had the advantage in that it had the ability to preserve more cervical motions after surgery than ACDF.