Healthy Joint Mechanics

A single-person knee scoping case study is used to support the idea that healthy joint surfaces may remain separated under deep flexion and simulated loading. Joint load can be transmitted through fluid, cartilage, and soft tissue without direct bony approximation. Synovial fluid and intact cartilage are described as allowing joint surfaces to be loaded without direct bone contact. Healthy joint capsules are presented as systems where bones likely do not directly touch. Bone contact is presented as more plausible when cartilage has degraded.