Interface pressure and stiffness of ready made compression stockings: Comparison of in vivo and in vitro measurements Hugo Partsch, MD, Bernhard Partsch,

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Interface pressure and stiffness of ready made compression stockings: Comparison of in vivo and in vitro measurements Hugo Partsch, MD, Bernhard Partsch, MD, Walter Braun Journal of Vascular Surgery Volume 44, Issue 4, Pages 809-814 (October 2006) DOI: 10.1016/j.jvs.2006.06.024 Copyright © 2006 The Society for Vascular Surgery Terms and Conditions

Fig 1 Measurement of interface pressure by medical stocking tester (MST). The measuring points are B, ankle; B1, gaiter area; C, largest calf circumference; and D, below knee. Journal of Vascular Surgery 2006 44, 809-814DOI: (10.1016/j.jvs.2006.06.024) Copyright © 2006 The Society for Vascular Surgery Terms and Conditions

Fig 2 Comparison of in vivo and in vitro measurement of interface pressure. Left, Pressure of several stockings measured by medical stocking tester (MST) tester at position B1 (gaiter area). Right, Pressure calculated from the force/extension-curves of the dynamometer from the same stockings. *P < .05. ***P < .001. Journal of Vascular Surgery 2006 44, 809-814DOI: (10.1016/j.jvs.2006.06.024) Copyright © 2006 The Society for Vascular Surgery Terms and Conditions

Fig 3 Comparison of in vivo pressures measured at B1 (gaiter area) by the medical stocking tester (MST) with in vitro pressure calculated from the force/extension-curve (dynamometer). The x axis shows the average of both measurements, and the y axis shows the difference of the two measurements. Journal of Vascular Surgery 2006 44, 809-814DOI: (10.1016/j.jvs.2006.06.024) Copyright © 2006 The Society for Vascular Surgery Terms and Conditions

Fig 4 Correlation of interface pressure values measured by the medical stocking tester (MST) in vivo and by the Zwick dynamometer in vitro. Journal of Vascular Surgery 2006 44, 809-814DOI: (10.1016/j.jvs.2006.06.024) Copyright © 2006 The Society for Vascular Surgery Terms and Conditions

Fig 5 Left, Static stiffness index (SSI) of the different stockings measured by the medical stocking tester (MST) in vivo (*P < .05 between two class I (CI) and one class II (CII) stocking). Right, Calculated stiffness values of these stockings derived from the dynamometer curves in vitro (**P < .01 between two class I and one class II stocking). There is also a significant difference (P < .05) between class I and class III in vitro (not shown in the graph). Journal of Vascular Surgery 2006 44, 809-814DOI: (10.1016/j.jvs.2006.06.024) Copyright © 2006 The Society for Vascular Surgery Terms and Conditions

Fig 6 Medical stocking tester (MST) pressure values obtained by class III stockings on the human leg in the lying (L) and standing (St) position compared with the data obtained with the same stockings on a wooden leg model. Journal of Vascular Surgery 2006 44, 809-814DOI: (10.1016/j.jvs.2006.06.024) Copyright © 2006 The Society for Vascular Surgery Terms and Conditions