PDF(Pubmed)
Abstract：
UNASSIGNED: The current classification system of progressive collapsing foot deformity (PCFD) is comprised of 5 possible classes. PCFD is understood to be a complex, three-dimensional deformity occurring in many regions along the foot and ankle. The question remains whether a deformity in one area impacts other areas. The objective of this study is to assess how each one of the classes is influenced by other classes by evaluating each associated angular measurement. We hypothesized that positive and linear correlations would occur for each class with at least one other class and that this influence would be high.
UNASSIGNED: We retrospectively assessed weight bearing CT (WBCT) measurements of 32 feet with PCFD diagnosis. The classes and their associated radiographic measurements were defined as follows: class A (hindfoot valgus) measured by the hindfoot moment arm (HMA), class B (midfoot abduction) measured by the talonavicular coverage angle (TNCA), class C (medial column instability) measured by Meary\'s angle, class D (peritalar sub-luxation) measured by the medial facet uncoverage (MFU), and class E (ankle valgus) measured using the talar tilt angle (TTA). Multivariate analyses were completed comparing each class measurement to the other classes. A p-value <0.05 was considered significant.
UNASSIGNED: Class A showed substantial positive correlation with class C (ρ=0.71; R2=0.576; p=0.001). Class B was substantially correlated with class D (ρ=0.74; R2=0.613; p=0.001). Class C showed a substantial positive correlation with class A (ρ=0.71; R2=0.576; p=0.001) and class D (ρ=0.75; R2=0.559; p=0.001). Class D showed substantial positive correlation with class B and class C (ρ=0.74; R2=0.613; p=0.001), (ρ=0.75; R2=0.559; p=0.001) respectively. Class E did not show correlation with class B, C or D (ρ=0.24; R2=0.074; p=0.059), (ρ=0.17; R2=0.071; p=0.179), and (ρ=0.22; R2=0.022; p=0.082) respectively.
UNASSIGNED: This study was able to find relations between components of PCFD deformity with exception of ankle valgus (Class E). Measurements associated with each class were influenced by others, and in some instances with pronounced strength. The presented data may support the notion that PCFD is a three-dimensional complex deformity and suggests a possible relation among its ostensibly independent features. Level of Evidence: III.
UNASSIGNED: We retrospectively assessed weight bearing CT (WBCT) measurements of 32 feet with PCFD diagnosis. The classes and their associated radiographic measurements were defined as follows: class A (hindfoot valgus) measured by the hindfoot moment arm (HMA), class B (midfoot abduction) measured by the talonavicular coverage angle (TNCA), class C (medial column instability) measured by Meary\'s angle, class D (peritalar sub-luxation) measured by the medial facet uncoverage (MFU), and class E (ankle valgus) measured using the talar tilt angle (TTA). Multivariate analyses were completed comparing each class measurement to the other classes. A p-value <0.05 was considered significant.
UNASSIGNED: Class A showed substantial positive correlation with class C (ρ=0.71; R2=0.576; p=0.001). Class B was substantially correlated with class D (ρ=0.74; R2=0.613; p=0.001). Class C showed a substantial positive correlation with class A (ρ=0.71; R2=0.576; p=0.001) and class D (ρ=0.75; R2=0.559; p=0.001). Class D showed substantial positive correlation with class B and class C (ρ=0.74; R2=0.613; p=0.001), (ρ=0.75; R2=0.559; p=0.001) respectively. Class E did not show correlation with class B, C or D (ρ=0.24; R2=0.074; p=0.059), (ρ=0.17; R2=0.071; p=0.179), and (ρ=0.22; R2=0.022; p=0.082) respectively.
UNASSIGNED: This study was able to find relations between components of PCFD deformity with exception of ankle valgus (Class E). Measurements associated with each class were influenced by others, and in some instances with pronounced strength. The presented data may support the notion that PCFD is a three-dimensional complex deformity and suggests a possible relation among its ostensibly independent features. Level of Evidence: III.
摘要：
■当前进行性塌陷性足畸形（PCFD）的分类系统包括5个可能的类别。PCFD被理解为复杂的，三维畸形发生在脚和脚踝的许多区域。问题仍然是一个地区的畸形是否会影响其他地区。这项研究的目的是通过评估每个相关的角度测量来评估每个类别如何受到其他类别的影响。我们假设每个类与至少一个其他类都会发生正相关和线性相关，并且这种影响会很高。
■我们回顾性评估了32英尺的负重CT（WBCT）测量结果与PCFD诊断。类别及其相关的射线照相测量定义如下：由后足力矩臂（HMA）测量的A类（后足外翻），通过距骨覆盖角（TNCA）测量的B级（中足外展），用Meary角度测量的C类(内侧柱不稳定性)，通过内侧小平面未覆盖(MFU)测量的D类(周围亚脱位)，和使用距骨倾斜角(TTA)测量的E类(踝外翻)。完成多变量分析，将每个类别的测量值与其他类别进行比较。P值<0.05被认为是显著的。
■A类与C类呈实质性正相关（ρ=0.71；R2=0.576；p=0.001）。B类与D类显著相关(ρ=0.74;R2=0.613;p=0.001)。C类与A类（ρ=0.71；R2=0.576；p=0.001）和D类（ρ=0.75；R2=0.559；p=0.001）呈实质性正相关。D类与B类和C类呈显著正相关(ρ=0.74;R2=0.613;p=0.001),(ρ=0.75;R2=0.559;p=0.001)。E类与B类没有相关性,C或D(ρ=0.24；R2=0.074；p=0.059)，(ρ=0.17；R2=0.071；p=0.179)，和(ρ=0.22;R2=0.022;p=0.082)。
■这项研究能够找到除踝关节外翻（E类）外的PCFD畸形成分之间的关系。与每个班级相关的测量都受到其他人的影响，在某些情况下具有明显的力量。所提供的数据可能支持PCFD是三维复杂畸形的概念，并暗示了其表面上独立的特征之间的可能关系。证据等级：III。
■我们回顾性评估了32英尺的负重CT（WBCT）测量结果与PCFD诊断。类别及其相关的射线照相测量定义如下：由后足力矩臂（HMA）测量的A类（后足外翻），通过距骨覆盖角（TNCA）测量的B级（中足外展），用Meary角度测量的C类(内侧柱不稳定性)，通过内侧小平面未覆盖(MFU)测量的D类(周围亚脱位)，和使用距骨倾斜角(TTA)测量的E类(踝外翻)。完成多变量分析，将每个类别的测量值与其他类别进行比较。P值<0.05被认为是显著的。
■A类与C类呈实质性正相关（ρ=0.71；R2=0.576；p=0.001）。B类与D类显著相关(ρ=0.74;R2=0.613;p=0.001)。C类与A类（ρ=0.71；R2=0.576；p=0.001）和D类（ρ=0.75；R2=0.559；p=0.001）呈实质性正相关。D类与B类和C类呈显著正相关(ρ=0.74;R2=0.613;p=0.001),(ρ=0.75;R2=0.559;p=0.001)。E类与B类没有相关性,C或D(ρ=0.24；R2=0.074；p=0.059)，(ρ=0.17；R2=0.071；p=0.179)，和(ρ=0.22;R2=0.022;p=0.082)。
■这项研究能够找到除踝关节外翻（E类）外的PCFD畸形成分之间的关系。与每个班级相关的测量都受到其他人的影响，在某些情况下具有明显的力量。所提供的数据可能支持PCFD是三维复杂畸形的概念，并暗示了其表面上独立的特征之间的可能关系。证据等级：III。
