Arthritic Knee of a Human Male Lacking the Patella, Anterior View

Description

Anterior exposure of a male knee joint centers on the distal femur superiorly and the proximal tibia inferiorly, with the patella absent so the femoral trochlear surface lies open to view. Medial and lateral femoral condyles articulate with the corresponding tibial plateaus, and the intercondylar eminence rises between the tibial articular surfaces. Across the weight-bearing regions, the articular cartilage appears thinned and irregular, with focal erosions and exposed subchondral bone most apparent on the tibial plateau. Surface damage is easiest to appreciate along the medial compartment, where degeneration commonly concentrates. Patellar absence matters because it changes both biomechanics and what you can assess from the anterior aspect: the trochlear cartilage and anterior femoral condyles become direct landmarks rather than being masked by the patella and retinacular tissues. Clinically, this presentation aligns with advanced osteoarthritis or post-traumatic chondral loss after meniscectomy, tibial plateau fracture, or chronic varus malalignment, where compressive load drives cartilage fibrillation, eburnation, and marginal osteophyte formation along the tibial rim. It also supports teaching discussions around patellectomy, extensor mechanism compromise, and why anterior knee pain can persist even when the patellofemoral joint has been surgically altered. Degeneration is not uniform. Use this artwork in orthopaedic teaching files on knee osteoarthritis, in pathology or radiology correlation pages that explain joint-space narrowing and subchondral sclerosis, and in surgical education materials introducing arthroplasty planning and compartment-specific wear patterns on the femoral condyles and tibial plateau. It also fits patient-facing modules explaining why cartilage loss on the tibial plateau drives pain with standing and walking. Anatomical accuracy verified by SciePro's Medical Advisory Board.