Departmentof Biomedical Engineering, École Polytechnique de Montréal, Québec, Canada.
Spine (Phila Pa 1976). 2012 Aug 1;37(17):E1045-53. doi: 10.1097/BRS.0b013e3182575938.
Reliability study.
To assess between-acquisition reliability of new multilevel trunk cross sections measurements, in order to define what is a real change when comparing 2 trunk surface acquisitions of a same patient, before and after surgery or throughout the clinical monitoring.
Several cross-sectional surface measurements have been proposed in the literature for noninvasive assessment of trunk deformity in patients with adolescent idiopathic scoliosis (AIS). However, only the maximum values along the trunk are evaluated and used for monitoring progression and assessing treatment outcome.
Back surface rotation (BSR), trunk rotation (TR), and coronal and sagittal trunk deviation are computed on 300 cross sections of the trunk. Each set of 300 measures is represented as a single functional data, using a set of basis functions. To evaluate between-acquisition variability at all trunk levels, a test-retest reliability study is conducted on 35 patients with AIS. A functional correlation analysis is also carried out to evaluate any redundancy between the measurements.
Each set of 300 measures was successfully described using only 10 basis functions. The test-retest reliability of the functional measurements is good to very good all over the trunk, except above the shoulders level. The typical errors of measurement are between 1.20° and 2.2° for the rotational measures and between 2 and 6 mm for deviation measures. There is a very strong correlation between BSR and TR all over the trunk, a moderate correlation between coronal trunk deviation and both BSR and TR, and no correlation between sagittal trunk deviation and any other measurement.
This novel representation of trunk surface measurements allows for a global assessment of trunk surface deformity. Multilevel trunk measurements provide a broader perspective of the trunk deformity and allow a reliable multilevel monitoring during clinical follow-up of patients with AIS and a reliable assessment of the esthetic outcome after surgery.
可靠性研究。
评估新的多层躯干横断面测量的采集间可靠性，以便在比较同一患者手术前后或整个临床监测期间的 2 次躯干表面采集时，确定什么是真正的变化。
已有文献提出了几种用于评估青少年特发性脊柱侧凸（AIS）患者躯干畸形的横断面表面测量方法。然而，仅评估并使用沿躯干的最大值来监测进展和评估治疗效果。
使用一组基函数，计算背部旋转（BSR）、躯干旋转（TR）以及冠状面和矢状面躯干偏距 300 个躯干横断面。每组 300 个测量值表示为单个功能数据。为了评估所有躯干水平的采集间变异性，对 35 名 AIS 患者进行了测试-再测试可靠性研究。还进行了功能相关分析，以评估测量值之间的任何冗余性。
仅使用 10 个基函数即可成功描述每组 300 个测量值。整个躯干的功能测量的测试-再测试可靠性良好至非常好，除肩部以上水平外。旋转测量的典型测量误差在 1.20°至 2.2°之间，偏差测量的典型测量误差在 2 至 6 毫米之间。BSR 和 TR 之间在整个躯干上具有很强的相关性，冠状面躯干偏距与 BSR 和 TR 之间具有中度相关性，矢状面躯干偏距与任何其他测量值之间无相关性。
这种新型的躯干表面测量表示方法可实现对躯干表面畸形的全面评估。多层躯干测量提供了对躯干畸形的更广泛视角，并允许在 AIS 患者的临床随访期间进行可靠的多层次监测，并在手术后对美观效果进行可靠评估。
