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Popliteal vein entrapment in the normal population
M Leon1, N Volteas, N Labropoulos
1Irvine Laboratory for Cardiovascular Investigation and Research, St Mary's Hospital Medical School, London, U.K.
European Journal of Vascular Surgery
|November 1, 1992
Summary
Full knee extension can cause significant popliteal vein compression in healthy individuals, potentially leading to venous stasis. This finding highlights risks for patients undergoing surgery or prolonged bed rest.
Area of Science:
- Vascular Medicine
- Diagnostic Imaging
- Physiology
Background:
- Popliteal vein compression can occur with knee flexion.
- Deep vein thrombosis (DVT) is a significant clinical concern.
Purpose of the Study:
- To determine the incidence and severity of popliteal vein compression during full knee extension in a healthy population.
- To assess the functional impact of this compression on venous outflow.
Main Methods:
- Duplex scanning of popliteal veins in 100 healthy volunteers (200 limbs) with knees flexed and fully extended.
- Air plethysmography to measure venous outflow in subjects with observed compression.
- Digital compression of the long saphenous vein to assess outflow obstruction.
Main Results:
- Knee extension caused complete obstruction in 17% and severe obstruction (<50% diameter decrease) in 10% of subjects.
- Functional venous outflow obstruction (outflow fraction <10%) was found in 8% of subjects with fully extended knees.
- All subjects with severe or complete obstruction showed moderate to severe outflow issues.
Conclusions:
- Popliteal vein compression upon full knee extension is common in healthy individuals.
- This compression can lead to functional venous outflow obstruction, with implications for venous stasis in immobilized patients.
- Further research is needed to explore the link between popliteal vein compression and postoperative deep vein thrombosis.