In Vivo Changes in Dynamic Adjacent Segment Motion 1 Year After One and Two-Level Cervical Arthrodesis

In vivo cervical vertebrae kinematic studies based on dual fluoroscopic imaging system measurement: A narrative review

“…The impact on the intervertebral disc is a compression-traction pattern change in the disc above the fused segment, while there is no impact below the fused segment [ 26 ]. According to the research by LeVasseur et al, after ACDF surgery, there is a significant increase in the ROM within the adjacent segments, and this effect is exacerbated by two-level joint fusion surgery [ 39 ]. Additionally, when assessing early changes in adjacent segment motion following cervical spine fusion surgery, mid-ROM appears to be more useful than long-term ROM [ 39 ].…”

“… LeVasseur et al, 2022 [ 38 ] Healthy subjects, 38 (15 M, 23F), 47.1 ± 6.7 C1–C7 vertebral bodies Flexion-Extension Helical axis of motion (HAM) ACDF does not alter the short-term kinematics of adjacent segments, thereby leading to the development of adjacent segment disease. Post ACDF surgery subjects, 62 (31 M, 31F), 47.3 ± 8.3 LeVasseur et al, 2022 [ 39 ] Healthy subjects, 23 (8 M, 15F), 46.5 ± 6.7 C1–C7 Flexion-Extension, head rotation ROM, Helical axis of motion (HAM) There is no evidence to suggest that adjacent segment ROM increases more after two-level fusion surgery compared to single-level fusion surgery. Moderate-range joint motion tasks are more favorable than full-range motion tasks for assessing postoperative joint kinematic changes.…”

Changes in intervertebral sagittal alignment of the cervical spine from supine to upright

“…Pregnant women, breastfeeding women, persons diagnosed with low bone density (which would adversely affect automated alignment measurements), and persons exposed to radiation as part of their current or previous job or as part of the treatment were excluded. This is a secondary analysis of data from a previous study of cervical spine kinematics in healthy young adults 19 and from an ongoing study designed to assess the effects of patient factors, surgical factors, and the number of levels fused on adjacent segment kinematics after ACDF 20–22 …”

“…This is a secondary analysis of data from a previous study of cervical spine kinematics in healthy young adults 19 and from an ongoing study designed to assess the effects of patient factors, surgical factors, and the number of levels fused on adjacent segment kinematics after ACDF. [20][21][22]…”

Biomechanik der HWS und ihre anatomischen Grundlagen

“…Die Kenntnis über die Veränderung der Belastung der Anschlusssegmente nach ventraler Fusion kann helfen das Risiko für Anschlussdegeneration durch Überlastung und besser einzuschätzen und zu verstehen [27]. Auch diese Diskussion wird allerdings noch immer kontrovers geführt [28]. Die Datenlage erlaubt aktuell noch nicht das entsprechende Risiko, insbesondere für Anschlussdegenerationen, individuell ausreichend objektiv präoperativ einzuschätzen.…”