Knight R Q
Department of Surgery, Virginia Mason Medical Center, Seattle, Washington.
Spine (Phila Pa 1976). 1993 May;18(6):755-8.
The use of complementary angle measurement improves the physician's ability to quantify the magnitude of the angle of rotation directly. By constructing a right triangle, with its base determined by the inferior end plate of the vertebral body, the angle of sagittal plane rotation can be determined readily. A perpendicular line drawn from the inferior end plate of the vertebra to the adjacent superior vertebra's inferior end plate will create an acute angle. This angle is complementary to the angle of sagittal plane rotation for this motion segment. The sum of two complementary angles, the acute angle described and the angle of sagittal plane rotation is equal to 90. Assessment of cervical spinal stability is crucial to the physician caring for traumatized patients. A checklist previously was developed by others to evaluate spinal stability; this relied heavily on the findings of routine lateral radiographs. Differences in the angle of sagittal plane rotational of greater than 11 between adjacent vertebra were equivalent to two points on this checklist, and five points or more suggested instability.
使用互补角测量可提高医生直接量化旋转角度大小的能力。通过构建一个直角三角形，其底边由椎体的下端板确定，矢状面旋转角度可轻松确定。从椎体下端板向相邻上位椎体的下端板画一条垂线会形成一个锐角。这个角与该运动节段的矢状面旋转角度互补。所描述的锐角与矢状面旋转角度这两个互补角的和等于90度。评估颈椎稳定性对治疗创伤患者的医生至关重要。其他人此前制定了一份清单来评估脊柱稳定性；这在很大程度上依赖于常规侧位X线片的结果。相邻椎体矢状面旋转角度差异大于11度相当于该清单上的两分，五分或更多分则提示不稳定。
