How do rooster comb shots help arthritic knees?

Rooster comb injections contain hyaluronan, which lubricates the joints and acts as a shock absorber to improve joint function functionality, according to WebMD. Hyaluronan is a viscous substance that allows the surfaces of the bones to glide on one another, decreasing osteoarthritis symptoms.

Doctors generally recommend weekly injections for a period for three to five weeks, notes WebMD. Patients may feel pain relief as soon as the fourth week, with relief lasting for as long as several months. Side effects of rooster comb injections include pain and joint swelling. People with allergies to poultry or eggs should not receive the injections.