Three-Dimensional Modelization of the Female Human Inferior Hypogastric Plexus: Implications for Nerve-Sparing Radical Hysterectomy.

BACKGROUND/AIMS: This study aims to describe the autonomic nervous network of the female pelvis with a 3D model and to provide a safe plane of dissection during radical hysterectomy for cervical cancer. METHODS: Pelvises of 3 human female fetuses were studied by using the computer-assisted anatomic dissection. RESULTS: The superior hypogastric plexus (SHP) was located at the level of the aortic bifurcation in front of the sacral promontory and divided inferiorly and laterally into 2 hypogastric nerves (HN). HN ran postero-medially to the ureter and in the lateral part of the uterosacral ligament until the superior angle of the inferior hypogastric plexus (IHP). IHP extended from the anterolateral face of the rectum, laterally to the cervix and attempted to the base of the bladder. Vesical efferences merged from the crossing point of the ureter and the uterine artery and ran through the posterior layer of the vesico-uterine ligament. CONCLUSIONS: The SHP could be injured during paraaortic lymphadenectomy. Following the ureter and resecting the medial fibrous part of the uterosacral ligament may spare the HN. No dissection should be performed under the crossing point of the ureter and the uterine artery.

Performance of an adjustable compression wrap in occupational leg swelling.

BACKGROUND: Edema in some subjects worsens over time and wraps help to reduce the leg volume. MATERIAL AND METHODS: An adjustable compression wrap was tried on volunteers for 5 h and volumes measured in each limb before and after wrapping using a 3D surface scanner (HandySCAN 3D®) to estimate the volume of the leg. The contralateral leg was used as control. RESULTS: We observed a significant decrease in volume in the wrap legs and an increase in the control legs (p < .001), both in the lower part of leg (p = .001) and in the upper part (p = .001). CONCLUSIONS: Using the Readywrap® for 5 hours significantly reduces the leg volume. This study enables Readywrap to be studied in a population that is easy to observe in the context of a research program. The Handyscan3D® was shown accurate and reproducible to assess leg volume in future studies.

Dogmas and controversies in compression therapy: report of an International Compression Club (ICC) meeting, Brussels, May 2011.

The International Compression Club (ICC) is a partnership between academics, clinicians and industry focused upon understanding the role of compression in the management of different clinical conditions. The ICC meet regularly and from these meetings have produced a series of eight consensus publications upon topics ranging from evidence-based compression to compression trials for arm lymphoedema. All of the current consensus documents can be accessed on the ICC website (http://www.icc-compressionclub.com/index.php). In May 2011, the ICC met in Brussels during the European Wound Management Association (EWMA) annual conference. With almost 50 members in attendance, the day-long ICC meeting challenged a series of dogmas and myths that exist when considering compression therapies. In preparation for a discussion on beliefs surrounding compression, a forum was established on the ICC website where presenters were able to display a summary of their thoughts upon each dogma to be discussed during the meeting. Members of the ICC could then provide comments on each topic thereby widening the discussion to the entire membership of the ICC rather than simply those who were attending the EWMA conference. This article presents an extended report of the issues that were discussed, with each dogma covered in a separate section. The ICC discussed 12 'dogmas' with areas 1 through 7 dedicated to materials and application techniques used to apply compression with the remaining topics (8 through 12) related to the indications for using compression.

Adjustable compression wraps: stretch, interface pressures and static stiffness indices.

BACKGROUND: Adjustable compression wraps (ACWs) may represent the future of compression for the treatment of the most severe stages of chronic venous diseases and lymphedema. We tested in five healthy subjects: Coolflex® from Sigvaris®; Juzo wrap 6000®, Readywrap® from Lohmann Rauscher®; Juxtafit® and Juxtalite® from Medi®, Compreflex® from Sigvaris®. The objective of this pilot study was to study the stretch, interface pressures, and Static Stiffness Index (SSI) of the six ACWs applied to the leg. METHODS: The stretch was evaluated by stretching the ACWs to their maximum length. Interface pressure measurements were performed using a PicoPress® transducer and a probe placed at point B1. Interface pressures were measured in the supine resting position and in the standing position. We calculated the SSI. We started the measurements at 20 mmHg in the supine position and increased the pressures by 5 mmHg to 5 mmHg. RESULTS: Coolflex® (inelastic ACW) cannot exceed a maximum pressure of 30 mmHg at rest with a maximum SSI of approximately 30 mmHg. Juzo wrap 6000® (a 50% stretch) and Readywrap® (a 60% stretch) have a profile of stiffness very near one to the other. The optimal stiffness for Juzo is from 16 mmHg to of 30 mmHg for a resting pressure between 25 mmHg and 40 mmHg. For Readywrap, the optimal stiffness is from 17 mmHg to 30 mmHg with a maximum SSI of 35mmHg. The optimal application zone of this wrap at rest is 30 to 45 mmHg. Juxtafit®, Juxtalite® and Compreflex® (respectively 70%, 80%, 124% stretch) can be applied with pressures above 60 mmHg but with maximum SSI of 20 mmHg for Circaid® and>30 mmHg for Compreflex®. CONCLUSIONS: This pilot study allows us to propose a classification of wraps according to their stretch: inelastic ACW and short or long stretch ACW (50-60% and 70%, 80%, and 124% stretch). Their stretch and stiffness could help to better determine what could be expected of ACWs in clinical practice.

The Use of 3D Printed Models for Surgical Simulation of Cranioplasty in Craniosynostosis as Training and Education.

BACKGROUND: The advance in imaging techniques is useful for 3D models and printing leading to a real revolution in many surgical specialties, in particular, neurosurgery. METHODS: We report on a clinical study on the use of 3D printed models to perform cranioplasty in patients with craniosynostosis. The participants were recruited from various medical institutions and were divided into two groups: Group A (n = 5) received traditional surgical education (including cadaveric specimens) but without using 3D printed models, while Group B (n = 5) received training using 3D printed models. RESULTS: Group B surgeons had the opportunity to plan different techniques and to simulate the cranioplasty. Group B surgeons reported that models provided a realistic and controlled environment for practicing surgical techniques, allowed for repetitive practice, and helped in visualizing the anatomy and pathology of craniosynostosis. CONCLUSION: 3D printed models can provide a realistic and controlled environment for neurosurgeons to develop their surgical skills in a safe and efficient manner. The ability to practice on 3D printed models before performing the actual surgery on patients may potentially improve the surgeons' confidence and competence in performing complex craniosynostosis surgeries.

Clinical analysis of the corona phlebectatica.

BACKGROUND: The corona phlebectatica (CP) is classically described as the presence of abnormally visible cutaneous blood vessels at the ankle with four components: "venous cups," blue and red telangiectases, and capillary "stasis spots." Previous studies showed that the presence of CP is strongly related to the clinical severity of chronic venous disorders (CVD) and the presence of incompetent leg perforators. The aim of this study was to select the most informative components of the CP in the assessment of the clinical severity of CVD patients. METHODS: A multicentric series of 262 unselected patients (524 limbs) consulted for CVD were clinically evaluated using a standardized form to record the CEAP "C" items and the presence of the four CP components. Standard categorical and ordinal statistics were used to describe the external validity of the CP components as severity indexes, taking the "C" classes as reference. RESULTS: "Stasis spots" (P < .001; r = .44) and blue telangiectases (P < .01; r = .32) were linearly associated with the ascending order of "C" classes, whereas the relationship is less clear for the red telangiectases and the "venous cups." The association pattern of the four components showed that only the blue telangiectases and the "stasis spots" were consistent with each other. Blue telangiectases were found more sensitive (0.91 vs 0.75) but less specific (0.52 vs 0.80) than "stasis spots" for advanced venous insufficiency (CEAP "C4-6"). CONCLUSION: This study shows that only blue telangiectases and "stasis spots" provide valuable information in patients with CVD and deserve to be taken into account in the evaluation of such patients. Further studies are needed to show the reproducibility of this data, which we regard as essential for clinical use.

Computer-assisted anatomic dissection (CAAD): evolution, methodology and application in intra-pelvic innervation study.

OBJECTIVE: Classic anatomical methods have limitations in micro determination of nerve fibre location. Furthermore, the precise detection of the nerve fibres nature is not possible by means of dissection. The combination of immunohistochemistry and three-dimensional reconstruction could be used to resolve these limitations of morphological sciences. Our aim is to describe the evolution of computer-assisted anatomic dissection (CAAD), which is an original method applied to study the distribution of intra-pelvic nerves in anatomic research. MATERIALS AND METHODS: Serial transverse sectioning of the pelvic region in rabbit, human fetus, infant and adult cadaver was performed. Sections were immuno-histochemically stained and digitized with a high optical resolution scanner. Photoshop 7 software was used in regrouping of the adult cadaver sections then a tri-dimensional reconstruction was achieved using WinSurf software. RESULTS: The 3D reconstruction of the immuno-histochemically stained histologic sections of the pelvis allowed for precise structural identification of the prostate and its innervations (in fetus, infant and adult). In addition, we reconstructed the entire intra-pelvic organs with accurate demonstration of the location of both adrenergic and cholinergic pathways. Moreover, we performed a virtual dissection of each of the pelvic structures with description of the exact location of the inferior hypogastric plexus, as well as the nature and the distribution of its fibres. CONCLUSION: The CAAD is an original method in anatomic research, which illustrates the fact that descriptive anatomy is still a dynamic science. This method allows for a 3D presentation of the intra-organic innervation, the nature of the nerve fibres, and the distribution of receptors and their neurotransmitters. This technique improves the understanding of the complex anatomic regions such as the pelvis from both surgical and educational point of view.

Anatomical Variations of the Median Nerve: A Cadaveric Study.

OBJECTIVES: Variations in the morphological anatomy of the median nerve such as formation, distribution, and communication have been well documented. All these variations should be taken into account when practicing any surgical approach for the treatment of injuries affecting the median nerve. Furthermore, they are of the utmost importance for interpretation of the clinical presentation. METHODS: The objective of this investigation was to determine the anatomical variations in the formation of the median nerve in cadavers at the Forensic Pathology department in Central Clinical Hospital of the Academy of Sciences of the Russian Federation between January 2022 and April 2022. A descriptive, cross-sectional, and prospective information source study was conducted on 42 anatomical bodies (corpses) and 84 brachial plexuses. RESULTS: After analyzing the results obtained in this investigation, we concluded that the median nerve presented variation in its formation in 22.6% of the investigated cases. These variations were more common in males (81.8%) than females (18.2%). The anatomical variation was unilateral in 7.1% and bilateral in 19% of all anatomical bodies examined. CONCLUSIONS: The median nerve presented a great number of variations in its formation in roughly 23% of the anatomical bodies, with male being the predominant gender. Furthermore, the most frequent region of formation was the axillary region (92.9%). For clinicians, it is important to remember these variations during surgical procedures in this area and during brachial plexus block.

Limitations to self-management of adjustable compression wraps in the elderly: results of a prospective cohort study.

BACKGROUND: Adjustable compression wraps are used for treating lymphedema and chronic venous insufficiency. These diseases often affect elderly patients with associated pathologies or other limiting factors. These can prevent the self-application of the device by patients on themselves. A better understanding of these factors or the associated pathology in the elderly is important before prescribing or not prescribing a wrap. METHODS: The objective of this prospective cohort study was to determine the main factors that prevent the self-application of the device (Circaid Juxtalite, Medi Italia S.r.l., Bologna, Italy) to the lower limb in the elderly. A private nurse selected the first 30 retired subjects over 65 years of age seen at home for routine nursing care. After a demonstration, she asked them to put on the wrap to reach a pressure of 40 mmHg in the calf (point B1). She recorded the pressures as the subjects applied the wrap twice in a row. The next day, the subject repeated the application of the wrap twice. We considered that an average pressure of more than 30 mmHg is recommended to treat venous edema or ulceration. RESULTS: Thirty percent of the subjects put on the wrap by themselves with an average pressure of at least 30 mmHg. Age is not a limiting factor. Obesity, gripping difficulties, cognitive impairment and low social status seem to be factors limiting the daily self-management of an adjustable compression wrap in the elderly. CONCLUSIONS: The self-management of adjustable compression wraps in the elderly person encounters obstacles that need to be known. The investigation has revealed that obesity, gripping difficulties, cognitive impairment and low social status are limiting factors. Age was not shown to be a limiting obstacle.

Anatomical variations of the femoral vein.

BACKGROUND: The venous anatomy is highly variable. This is due to possible venous malformations (minor truncular forms) occurring during the late development of the embryo that produce several anatomical variations in the number and caliber of the main venous femoral trunks at the thigh level. Our aim was to study the prevalence of the different anatomical variations of the femoral vein at the thigh level. METHODS: This study used 336 limbs of 118 fresh, nonembalmed cadavers. The technique included washing of the whole venous system, latex injection, anatomical dissection, and then painting of the veins. RESULTS: The modal anatomy of the femoral vein was found in 308 of 336 limbs (88%). Truncular malformations were found in 28 of 336 limbs (12%); unitruncular configurations in 3% (axo femoral trunk [1%] and deep femoral trunk [2%]). Bitruncular configurations were found in 9% (bifidity of the femoral vein [2%], femoral vein with axio-femoral trunk [5%], and femoral vein with deep femoral trunk [2%]). CONCLUSION: Truncular venous malformations of the femoral vein are not rare (12%). Their knowledge is important for the investigation of the venous network, particularly the venous mapping of patients with cardiovascular disease. It is also important to recognize a bitruncular configuration to avoid potential errors for the diagnosis of deep venous thrombosis of the femoral vein, in the case of an occluded duplicated trunk.

Feasibility of a fetal anatomy 3D atlas by computer-assisted anatomic dissection.

OBJECTIVE: To assess the feasibility of 3D modelisation of fetal anatomy by using the Computer-assisted anatomic dissection (CAAD) based on immunolabeled histologic slices and MRI slices with a specific 3D software. STUDY DESIGN: For pelvis and lower limbs, subjects came from legal abortion, medical pregnancy termination, or late miscarriage. Specimens were fixed in 10 % formalin, then embedded in paraffin wax and serially sectioned. The histological slices were stained using HES and Masson Trichrome. Protein S-100 and D2-40 markers were used for immuno-labelling. Serial transverse sections were digitalized and manually aligned. Fetal brain slices were obtained from in utero or post-mortem MRI. RESULTS: CAAD was performed on 10 fetuses: pelvis was modelised with 3 fetuses of 13, 15 and 24 W G, lower limbs with 2 fetuses of 14 and 15 W G and brain with 5 fetuses aged between 19 and 37 W G. Fetal pelvis innervation was analysed after immunolabelling and nerves appeared proportionally bigger than in adults with the same topography. Lower limbs analysis revealed that nerve development was guided by vascular development: the sciatic nerve along the big axial vein, the saphen nerve along the big saphen vein and the sural nerve along the small saphen vein. Fetal brain study allowed to describe the gyration process and the lateral ventricle development. CONCLUSION: CAAD technique provides an accurate 3D reconstruction of fetal anatomy for lower limbs and pelvis but has to be improved for brain model since midline structures were not amendable for analysis. These results need to be confirmed with larger series of specimens at different stages of development.

The 2020 update of the CEAP classification system and reporting standards.

The CEAP (Clinical-Etiology-Anatomy-Pathophysiology) classification is an internationally accepted standard for describing patients with chronic venous disorders and it has been used for reporting clinical research findings in scientific journals. Developed in 1993, updated in 1996, and revised in 2004, CEAP is a classification system based on clinical manifestations of chronic venous disorders, on current understanding of the etiology, the involved anatomy, and the underlying venous pathology. As the evidence related to these aspects of venous disorders, and specifically of chronic venous diseases (CVD, C2-C6) continue to develop, the CEAP classification needs periodic analysis and revisions. In May of 2017, the American Venous Forum created a CEAP Task Force and charged it to critically analyze the current classification system and recommend revisions, where needed. Guided by four basic principles (preservation of the reproducibility of CEAP, compatibility with prior versions, evidence-based, and practical for clinical use), the Task Force has adopted the revised Delphi process and made several changes. These changes include adding Corona phlebectatica as the C4c clinical subclass, introducing the modifier "r" for recurrent varicose veins and recurrent venous ulcers, and replacing numeric descriptions of the venous segments by their common abbreviations. This report describes all these revisions and the rationale for making these changes.

Coexistence of adrenergic and cholinergic nerves in the inferior hypogastric plexus: anatomical and immunohistochemical study with 3D reconstruction in human male fetus.

Classic anatomical methods have failed to determine the precise location, origin and nature of nerve fibres in the inferior hypogastric plexus (IHP). The purpose of this study was to identify the location and nature (adrenergic and/or cholinergic) of IHP nerve fibres and to provide a three-dimensional (3D) representation of pelvic nerves and their relationship to other anatomical structures. Serial transverse sections of the pelvic portion of two human male fetuses (16 and 17 weeks' gestation) were studied histologically and immunohistochemically, digitized and reconstructed three-dimensionally. 3D reconstruction allowed a 'computer-assisted dissection', identifying the precise location and distribution of the pelvic nerve elements. Proximal (supra-levator) and distal (infra-levator) communications between the pudendal nerve and IHP were observed. By determining the nature of the nerve fibres using immunostaining, we were able to demonstrate that the hypogastric nerves and pelvic splanchnic nerves, which are classically considered purely sympathetic and parasympathetic, respectively, contain both adrenergic and cholinergic nerve fibres. The pelvic autonomic nervous system is more complex than previously thought, as adrenergic and cholinergic fibres were found to co-exist in both 'sympathetic' and 'parasympathetic' nerves. This study is the first step to a 3D cartography of neurotransmitter distribution which could help in the selection of molecules to be used in the treatment of incontinence, erectile dysfunction and ejaculatory disorders.

Prospective randomized controlled study of patient compliance in using a compression stocking: Importance of recommendations of the practitioner as a factor for better compliance.

Background Patient compliance is the cornerstone of compression therapy success. However, there has been up to now no tool to assess it other than self-reporting by the patient, which is not reliable. Material and methods Forty active females classified C2S were enrolled to wear compression stockings (CS) providing a pressure of 15-20 mmHg at the ankle. A thermal probe was inserted in the stocking (Thermotrack®), recording the skin temperature every 20 min for four weeks. The patients were randomized in two groups of 20: - Group 1: Receiving minimal recommendations by their physician at the office. - Group 2: Receiving in-depth recommendations by the physician reinforced with SMS message which were repeated once a week for four weeks. The basic CEAP classification and the quality of life (QoL) were recorded before and after four weeks. Results The two groups are similar for age, symptoms and type of CS. The analysis of the thermal curves showed a significant increase (+33%) in the average wearing time daily in the group 2: 8 h vs. 5.6 h (group1) p < 0.01. The average number of days worn per week is also increased: 3.4 (group 1) vs. 4.8 (group 2), thus improving patient compliance from 48.5% to 70% as a direct result of the physician recommendations ( p < 0.001). Conclusion This is the first study assessing the real compliance in CVD patients of using compression. It shows that better and repeated recommendations by the practitioner result in an increase in time the compression is used by 33%. The study also suggests that the number of days the compression stocking is worn is a good criterion of patient compliance.

Treatment protocol on stasis edema in poorly mobile nursing home patients.

BACKGROUND: Prolonged immobility in the sitting position in the elderly is known to produce venous stasis with leg edema and possible skin changes. METHODS: The authors have tested a treatment protocol in 30 patients to quantify the reduction of volume caused by an adjustable compression Velcro® wrap (Circaid Juxtalite®, medi GmbH, Bayreuth, Germany) after 15 days and to compare its effect on the leg volume for the next 15 days with 15- to 20-mmHg compression stockings (CS). RESULTS: The authors noted a volume decrease between T0 and T15 by 10.8% (52 legs) under Circaid Juxtalite®. At T30, they observed a non-significant difference between Circaid Juxtalite® (-1%) and the CS (1.3%). CONCLUSIONS: A Velcro® adjustable compression wrap (Circaid Juxtalite®) is efficient in reducing stasis edema in the elderly. Stabilization of the leg volume with the use of 15-20 mmHg CS suggests that a high pressure to maintain results is not required to maintain results.

Evaluation of three different devices to reduce stasis edema in poorly mobile nursing home patients.

BACKGROUND: Prolonged immobility in the sitting position in the elderly is known to produce venous stasis with leg edema and possible skin changes. Compression stockings are often applied for this clinical problem. There is few experienced nursing staff available to supervise the difficult task of stocking application. METHODS: The authors have researched other effective and simple devices that may be suitable alternatives. This article reports the results of three different devices to reduce leg edema, as measured by reduction in leg volume: an electro-stimulation device, an adjustable compression Velcro® wrap and a short stretch bandage, each tested over a two-hour period. RESULTS: In this randomized pilot study including 38 patients, the authors observed no difference in leg volume following electro-stimulation (Veinoplus®). They noted a significant reduction in leg volume following use of the other two devices, more with the adjustable Velcro® wrap compression (Circaid Juxtafit®) than with the short stretch bandage (Rosidal K®). Measurement of the interface pressures created by these two devices and also assessing the stiffness created by applying each device for two hours confirm that pressure is more important than stiffness in the reduction of edema in these particular patients. CONCLUSIONS: This pilot study is to be added to the results of previous published studies showing the efficacy in reducing leg edema of Velcro® adjustable compression wrap and its ease of use.

Three-dimensional reconstruction of urogenital tract from Visible Korean Human.

The three-dimensional (3D) modeling from anatomical images is revealed to be a remarkable learning tool in anatomy. This is particularly true for the pelvis area and the urogenital tract. The authors present here a 3D reconstruction of the male urogenital tract from the Visible Korean Human data. The segmentation of 440 anatomical images was arranged in a pile and processed by the SURFdriver software to build an interactive 3D model. Forty-two anatomical structures were reconstructed, including kidneys, ureters, urinary bladder (outer and inner boundaries), urethra, testes, epididymides, ducti deferens, seminal vesicles, prostate, rectum, anal canal, abdominal aorta, superior mesenteric artery, renal arteries, inferior vena cava, renal veins, lumbar vertebrae, intervertebral discs, sacrum, hip bones, femurs, and skin. Three-dimensional models of 42 anatomical structures can be individually and interactively manipulated. In addition, the use is able to control the transparency of the model. The aim of this computerized modeling is to present a learning tool for students and patients. In the near future, it could be the basis of new simulation tools for surgeon's training.

Anatomy of the lymph node venous networks of the groin and their investigation by ultrasonography.

OBJECTIVE: To describe the anatomy of the lymph node venous networks of the groin and their assessment by ultrasonography. MATERIAL AND METHODS: Anatomical dissection of 400 limbs in 200 fresh cadavers following latex injection as well as analysis of 100 CT venograms. Routine ultrasound examinations were done in patients with chronic venous disease. RESULTS: Lymph node venous networks were found in either normal subjects or chronic venous disease patients with no history of operation. These networks have three main characteristics: they cross the nodes, are connected to the femoral vein by direct perforators, and join the great saphenous vein and/or anterior accessory great saphenous vein. After groin surgery, lymph node venous networks are commonly seen as a dilated and refluxing network with a dystrophic aspect. We found dilated lymph node venous networks in about 15% of the dissected cadavers. CONCLUSION: It is likely that lymph node venous networks represent remodeling and dystrophic changes of a normal pre-existing network rather than neovessels related to angiogenic factors that occur as a result of an inflammatory response to surgery. The so-called neovascularization after surgery could, in a number of cases, actually be the onset of dystrophic lymph node venous networks.Lymph node venous networks are an ever-present anatomical finding in the groin area. Their dilatation as well as the presence of reflux should be ruled out by US examination of the venous system as they represent a contraindication to a groin approach, particularly in recurrent varicose veins after surgery patients. A refluxing lymph node venous network should be treated by echo-guided foam injection.

Anatomy of the veno-muscular pumps of the lower limb.

OBJECTIVE: To study the anatomy of the veno-muscular pumps of the lower limb, particularly the calf pump, the most powerful of the lower limb, and to confirm its crucial importance in venous return. METHODS: In all, 400 cadaveric limbs were injected with green Neoprene latex followed by an anatomical dissection. RESULTS: The foot pump is the starter of the venous return. The calf pump can be divided into two anatomical parts: the leg pump located in the veins of the soleus muscle and the popliteal pump ending in the popliteal vein with the unique above-knee collector of the medial gastrocnemial veins. At the leg level, the lateral veins of the soleus are the bigger ones. They drain vertically into the fibular veins. The medial veins of the soleus, smaller, join the posterior tibial veins horizontally. At the popliteal level, medial gastrocnemial veins are the largest veins, which end uniquely as a large collector into the popliteal vein above the knee joint. This explains the power of the gastrocnemial pump: during walking, the high speed of the blood ejection during each muscular systole acts like a nozzle creating a powerful jet into the popliteal vein. This also explains the aspiration (Venturi) effect on the deep veins below. Finally, the thigh pump of the semimembranosus muscles pushes the blood of the deep femoral vein together with the quadriceps veins into the common femoral vein. CONCLUSION: The veno-muscular pumps of the lower limb create a chain of events by their successive activation during walking. They play the role of a peripheral heart, which combined with venous valves serve to avoid gravitational reflux during muscular diastole. A stiffness of the ankle or/and the dispersion of the collectors inside the gastrocnemius could impair this powerful pump and so worsen venous return, causing development of severe chronic venous insufficiency.