The Arthritic Patella of a Human Male Viewed Posteriorly

Description

Centered in a posterior view, the patella (kneecap) is oriented with the broad base superiorly and the apex inferiorly, with the medial and lateral articular facets separated by a prominent vertical ridge. The posterior articular surface shows irregularity consistent with arthritis, where cartilage loss exposes pitted subchondral bone and produces roughened margins along the facet contours. A cut surface through the bone reveals a dense compact cortex peripherally and trabecular (cancellous) bone centrally, with red marrow interspersed among the spicules and paler fatty marrow deeper within. Patellofemoral osteoarthritis often concentrates on the lateral facet because lateral tracking increases contact pressure against the trochlea, and this posterior perspective makes that wear pattern easier to teach than an anterior view of the extensor mechanism. Eburnation, subchondral sclerosis, and marginal osteophyte formation on the patellar facets correlate with anterior knee pain, crepitus on stair climbing, and the “movie-theater” pain pattern seen in degenerative patellofemoral disease. For arthroplasty planning, the condition of the posterior articular surface helps frame discussions about patellar resurfacing, denervation, and maltracking management during total knee replacement. Use this illustration in musculoskeletal anatomy and pathology courses to contrast normal hyaline cartilage coverage with exposed subchondral bone, and in orthopedic or rheumatology publications addressing patellofemoral joint degeneration in adult males. It also fits clinical slide decks on anterior knee pain, chondromalacia patellae, and postoperative evaluation after patellar resurfacing or realignment procedures. Anatomical accuracy verified by SciePro's Medical Advisory Board.