Biomechanical Sequelae of Short Lumbar Fusion

摘要: The biomechanical effects of “floating” L4–L5 anterior interbody fusion on the adjacent, unfused segments were investigated experimentally using cadaveric specimens. mechanical characteristics isolated lumbar spine specimens measured before and after in vitro simulated fusion. It was found that there a significant increase segmental flexion deformation at L5–S1 decrease extension L3–L4 L5–S1. These findings suggest functional range motion segments, especially level below fusion, i.e., L5–S1, biased toward floating This result also suggests more frequently have to operate extremes their normal ranges partially compensate for loss mobility fused level. However, largest movement segment, which exhibited range. Thus, this segment has highest possibility working beyond its physiological limit flexion.