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Compartments of knee2/29/2024 A varus force is applied by dropping the post and placing the leg in a figure-of-4 position. A direct valgus force is applied against the post for viewing the medial compartment. (B) The lateral post, in gray, is placed approximately 5 cm proximal to the proximal pole of the patella. The foot of the operating table is dropped, allowing a direct varus and valgus force to be applied. (A) The circumferential leg holder, in orange, is placed around the upper thigh. A tourniquet has been placed over cotton padding. In this figure the patient is prone with the head to the right. Finally, a plastic drape is affixed to the patient's thigh so that the preparation solution does not drip up and under the tourniquet.Ī varus or valgus force may be applied to the knee by the use of 1 of 2 devices. Generally, the tourniquet pressure is set to 350 mm Hg for a normal adult. The tourniquet is then placed circumferentially around the thigh high enough to allow adequate access to the knee after draping. Cotton cast padding is wrapped once or twice around the thigh with care taken to avoid wrinkles. An assistant holds the leg, or the surgeon may place the patient's knee against his or her chest to elevate the thigh. After the patient is positioned, a safety belt is placed around the waist. The patient's pelvis is then moved to the very edge of the operating table to provide the best leverage for positioning the leg against the leg holder or post ( Figs 1 and 2). The patient is positioned with the heels at the end of the table to facilitate access by the surgeon and assistant. This article and Video 1 will review patient positioning, tourniquet placement, use of the leg holder, and draping.
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