Meniscus Prosthetic Devices with Anti-Migration or Radiopaque Features

A meniscus prosthetic device for replacing at least a portion of a meniscus within a knee joint, comprising:

• a central portion having an upper surface for engagement with a portion of a femur and an opposing lower surface for engagement with a portion of a tibia, the central portion formed of a polyurethane and being reinforced by an annular tension structure;
• an outer portion surrounding the central portion and having an increased thickness relative to the central portion, the outer portion comprising a posterior portion and an opposing anterior portion, the posterior portion defining a posterior retention channel configured to engage posterior elements within the knee joint.

A meniscus prosthetic device for replacing at least a portion of a meniscus within a knee joint, comprising:

• a central portion having an upper surface for engagement with a portion of a femur and an opposing lower surface for engagement with a portion of a tibia, the central portion formed of a resilient polymer and being reinforced by an annular tension structure;
• and
• an outer portion surrounding the central portion and having an increased thickness relative to the central portion, the outer portion comprising a posterior portion with a first height and an opposing anterior portion, the anterior portion defining an enlarged anterior retention structure having a second height, wherein the second height is as least 50 percent larger than the first height.

A prosthetic meniscus device for placement in a joint, comprising:

• a central portion having an upper surface for engagement with a first bone defining the joint and an opposing lower surface for engagement with a second bone defining the joint, the central portion formed of a resilient polymer and being reinforced by an annular tension structure;
• and
• an outer portion surrounding the central portion, the outer portion including a plurality of flexible attachment members extending from adjacent the annular tension structure outwardly beyond an outer sidewall of the outer portion.

A prosthetic meniscus device for placement in a joint, comprising:

• a meniscus body portion having an upper surface for engagement with a first bone defining the joint and an opposing lower surface for engagement with a second bone defining the joint, the meniscus body portion formed of a polymer and having a sidewall extending between the upper surface and the lower surface, the sidewall defining a perimeter of the meniscus body portion;
• and
• a radiopaque member positioned along at least a portion of the perimeter and retained in position by a releasable attachment mechanism.