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Medicare only covers the seat-lift mechanism, but not the actual chair/furniture portion itself. A lift chair is considered medically necessary if all of the following coverage criteria are met: The beneficiary must have severe arthritis of the hip or knee only, or have a severe neuromuscular disease.

Infinite position lift chairs can go from the sitting position to a full recline, where the chair lays flat. The footrest and back can be operated independently. Some models can go into the Trendelenburg position and zero-gravity position. The Trendelenburg position is where the feet are above the head.

Lift chairs are chairs that feature a powered lifting mechanism that pushes the entire chair up from its base and so assists the user to a standing position. In the United States, lift chairs qualify as Durable Medical Equipment under Medicare Part B.

Begin by counting the number of teeth on the largest front sprocket and largest rear. These numbers are often printed right on the sprockets and cogs. Next, measure the distance between the middle of the crank bolt to the rear axle. This is also the chain stay length.

The success of women's tennis, however, did little to help the fortunes of women's professional team sports. Women's professional team sports achieved popularity for the first time in the 1990s, particularly in basketball and football (soccer).

The crankset, rear cassette, chain and derailleurs are known collectively as the drivetrain, pictured here: Chain rings: Bikes have one, two or three front chain rings, also known as the crankset. A bike with two chain rings is called a double. A bike with three chain rings is called a triple.