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The rounded ends of the distal femur are referred to as condyles. Specifically, the femur has two condyles, the medial and lateral condyles, which articulate with the tibia and contribute to the knee joint's structure. These bony projections are crucial for weight-bearing and movement, allowing for smooth articulation during flexion and extension of the knee.

In contrast, foramen typically refer to openings or holes in bones that allow the passage of nerves and blood vessels, which is not applicable to the structure of the distal femur. Tubercles are small, rounded projections or bumps on bones, which serve as attachment points for muscles and ligaments rather than joint surfaces. Trochanters are large, rough projections found on the femur that serve as sites for muscle attachment, also not applicable to the rounded ends of the femur. Thus, the term condyles specifically and accurately describes the features at the distal end of the femur that are involved in joint function.