Human cartilage tissue pieces and blocks are solid, three-dimensional specimens of native hyaline, elastic, or fibrocartilage harvested from human donors and supplied for research and development applications. Cartilage is a specialized connective tissue characterized by a sparse population of chondrocytes embedded within an abundant extracellular matrix (ECM) composed of glycosaminoglycans and collagen. Unlike most other connective tissues, cartilage is avascular and aneural, meaning that it receives no direct blood supply and is not innervated. Consequently, its intrinsic repair capacity is extremely limited, and damage to cartilage in adults heals slowly or not at all. This biological limitation underlies the intense research interest in cartilage biology, osteoarthritis pathogenesis, and regenerative strategies, and it explains why access to well-characterized human cartilage tissue specimens is essential for translational research.

Types and Sources of Human Cartilage Tissue

Human cartilage tissue supplied for research encompasses several anatomically and biochemically distinct subtypes. Articular cartilage is the hyaline cartilage covering the surfaces of diarthrodial joints, including the femoral condyles, tibial plateaus, and femoral heads. It functions as a load-bearing and shock-absorbing surface that distributes mechanical forces across the joint. Costal cartilage is hyaline cartilage from the rib cage, frequently used as a source of chondrocytes for tissue-engineering applications owing to its accessibility and proliferative capacity. Menisci are fibrocartilaginous structures of the knee that contribute to load transmission and joint stability. Synovial membrane is frequently supplied alongside cartilage from the same donor joint, enabling matched analyses of cartilage and synovium in studies of joint pathology. Additional cartilage sources include nasal septum and ear cartilage.

Donor joints from which these tissues are procured include the knee and hip, which are the most common sources for osteoarticular research specimens. Tissues may be obtained from patients undergoing total joint arthroplasty, from deceased donors, or from living donors under informed consent, depending on the supplier and the intended application.