FAQ Based Instructions

1What Should I expect after a Femoral or Popliteal block is finished?
As the numbing medication takes effect, you will notice a gradual numbing sensation in the front of your knee while the back of the knee may feel normal. Typically, people are still able to move their leg and toes (which may feel “tingly”), but temporarily lose the ability to extend their leg. It is important that you don’t try to move your leg without direction from the medical staff as you might unintentionally injure yourself. After surgery, a knee brace may be used to safely support your leg. After you are discharged from the hospital you should avoid exposing your leg to extremes in temperature until full sensation in your leg has returned.
2How long will it take for the block to start working?
The onset of the Femoral or Popliteal block varies depending on the type of numbing medication that is used. Usually, a combination of mepivicaine and ropivicaine is used. Lidocaine usually starts to work in 5-15 minutes, while ropivicaine starts to work in 20-30 minutes. Mepivicaine is used to get the block working sooner, while ropivicaine keeps the block working longer.
3How long does the block last?
The duration of action of the Femoral or Popliteal block depends on the mixture of the numbing medications used by the anesthesia staff. Usually, a combination of mepivicaine and ropivicaine is utilized resulting in approximately 8-12 hours of pain relief. However, patients metabolize (eliminate) the medications at varying rates, and the actual duration of the block can vary greatly from person to person. Typically, you can expect the block to be maximally effective for at least 6-8 hours after it is placed.
4Are there any side-effects associated with the femoral block?
There are a few expected side-effects with the use of the Femoral or Popliteal block. Each of these temporary side-effects is expected to resolve completely once the block has worn off. •You may notice some bruising or swelling at the site of injection. •Weakness of the muscles responsible for bending and extending your leg. •Hematoma formation: development of a collection of blood around the femoral nerve. This is a temporary side-effect and may result in the development of bruising in the injection area.

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