1,720,973 research outputs found
Weightbearing CT Assessment of Foot and Ankle Joints in Pes Planovalgus Using Distance Mapping
No full textThe goal of this study was to describe the abnormal joint surface interaction at the ankle, hindfoot and midfoot joints in patients presenting with Pes Planovalgus (PPV) using three-dimensional (3D) distance mapping on weightbearing computed tomography (WBCT) images by comparing a series of PPVs to a series of normally-aligned feet. We hypothesized that in PPVs joint interactions would reveal significantly increased spaces in the medial side of the ankle, hindfoot and midfoot joints
Distance Mapping of the Foot and Ankle Joints using Weight Bearing CT: The Cavovarus Configuration
No full textDistribution of Bone Mineral Density in the Ankle Joint: Correlation with Hindfoot Alignment
No full textCATEGORY: Ankle; Basic Sciences/Biologics; Hindfoot INTRODUCTION/PURPOSE: Abnormal Hindfoot Alignment (HA) has been correlated with increased complication rates in ankle fusion or replacement. Altered Bone Mineral Density (BMD) due to abnormal stress distribution could be predisposing factor for those unwanted outcomes. The objective of this study was to assess spatial distribution of BMD around the ankle joint in patients with normal or abnormal HA using cone beam Weight Bearing CT. METHODS: Retrospective comparative study including 81 ankles allocated into 3 groups based on the Foot Ankle Offset (FAO): 27 normal (0%5%). groups were comparable by age (p=0.967), Body Mass Idex (p=0.669), sex (p=0.820) and side (p=0.708). Semi- automatic segmentation (BoneLogic, Disior) was applied to identify bones. Tibia and talus were digitally compartmented in medial (M) and lateral (L) volumes relative to the median sagittal plane. Mean Hounsfield Unit (HU) value per compartment was used to assess BMD and to calculate the Medial over Lateral HU ratio (M/L-HU). Comparisons among the three groups were performed using one-way ANOVA, Kruskal-Wallis and Chi(2) tests. RESULTS: Mean +- standard deviation HU values in the compartments in normal cases were 495.2+-110 (medial tibia), 495.6+- 108.1 (lateral tibia), 368.9+-80.3 (medial talus), 448.2+-90.6 (lateral talus) and 686.7+-120.4 (fibula). Upon comparison of the mean BMD value for each compartment in the three groups, the difference did not achieve statistical significance. Conversely, the tibia HU-M/L ratio (0.88+-0.14 in valgus cases, 0.99 +- 0.08 in normally-aligned cases and 1.04+-0.08 in varus cases) and the talar HU- M/L ratio (0.68+-0.18 in valgus cases, 0.82+-0.08 in normally-aligned cases and 0.96+-0.20 in varus cases) were significantly different in the three groups (p<0.001). CONCLUSION: We found that the BMD in distal tibia, fibula and the talus varies with hindfoot alignment. The increased HU medio- lateral ratio in varus cases was consistent with a greater medial bone density in the tibia and talus, while the decreased ratio found in valgus cases suggested a more lateral concentration in both bones. This data supports the role of WBCT in analyzing BMD distribution. This method could be clinically useful in ankle OA to evaluate bone quality for such considerations as surgical indications or implant positioning
Redefining Hindfoot Alignment Based on Pathology rather than Morphology: A Prospective Observational Diagnostic Study on 250 Feet
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A Citation Analysis Study of the 50 Most-Cited Articles on the Achilles Tendon
No full textCATEGORY: Other; Basic Sciences/Biologics INTRODUCTION/PURPOSE: Achilles tendon injuries represent one of the most common reasons of referral to orthopaedic surgeons. The purpose of this study was to determine the 50 most-cited articles on Achilles tendon pathologies in order to outline their characteristics, examine trends in publication and evaluate the correlation between citations and the quality of evidence. METHODS: We searched Web of Science papers with the single keyword 'Achill*'. We identified and analyzed the top 50 most- cited articles and abstracted their characteristics. The methodological quality was assessed using the modified Coleman Methodology Score (mCMS). The correlation between the number of citations, the citation rate (citations/y), the impact factor of the journal for the year 2020 (JIF), the year of publication, the Level of Evidence (LoE), the type of study (tendon rupture, acute tendinopathy, chronic tendinopathy), the sample size and the mCMS was assessed through multiple bivariate analyses (Pearson or Spearman correlation coefficient). RESULTS: Mean number of citations (+-SD) was 244 +- 88.8 (range, 657 to 157), with a total number of citations of 12.194 and a mean citation rate of 12.6 +- 5.4 (range, 28 to 3). The mean impact factor for the ten journals in which the 50 manuscripts were published was 5.1. The citation rate correlated with the number of citations (R=0.56, p<0.001), the year of publication (R=0.60, p<0.001) and the LoE (R=-0.37, p=0.022), but not with the citation rate (p=0.15). The year of publication correlated with the LoE as well (R=-0.43, p=0.008). Also, the quality of studies (in terms of mCMS) correlated with the impact factor of journals (R=0.35, p 0.03) and with the LoE (R=-0.48, p=0.003). Only 20 out of 39 primary studies (51%) had a prospective and comparative design, while 19 studies (48%) were classified as of poor quality (< 50 points using the mCMS). CONCLUSION: Most-cited articles in the field of Achilles tendon injuries have generally been published on high-impact journals. Although the impact factor positively correlates with the quality of studies, their methodology is poor in almost half of cases. The average Level of Evidence provided by studies and their citation rate are both significantly increasing over time. Citation-based indicators do not represent robust measures of quality in studies dealing with Achilles tendon pathologies
Influence of Weight-Bearing Computed Tomography in the New Staging System of Progressive Collapsing Foot Deformity Classification
No full textThe Efficacy of Surgical Treatment in the Correction of Adult Acquired Flatfoot Deformity: A Three- dimensional Biometric Weightbearing Computed Tomography Evaluation
No full textThree-Dimensional Coverage Maps in the Assessment of Chopart Subluxation in Progressive Collapsing Foot Deformity
No full textMiddle Facet Subluxation Correlation with Foot and Ankle Offset in the Assessment of Progressive Collapsing Foot Deformity
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