In one embodiment, a medical device includes a tissue anchor has a first portion and a second portion. The tissue anchor is configured to be placed within bodily tissue of a patient. The first portion of the tissue anchor includes an extension member configured to engage the bodily tissue to help retain the tissue anchor within the bodily tissue. The first portion has an inner surface and defines a cavity. The second portion of the tissue anchor has a helical ridge. The helical ridge is configured to engage the inner surface of the first portion of the tissue anchor to movably couple the second portion of the tissue anchor to the first portion of the tissue anchor.
