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This entry refers to a peer‑reviewed medical journal issue — Journal of Bone and Joint Surgery, No. 4, November 1968 — which includes a special commemorative section titled “Fifty Years A.O.B.” likely celebrating the 50‑year anniversary of the American Orthopaedic Association’s association with the Journal or its influence in orthopaedics. The Journal of Bone and Joint Surgery is a leading biweekly publication in orthopaedic surgery and musculoskeletal medicine established in 1889; it publishes research articles, clinical studies, and historical or anniversary retrospectives relevant to surgical practice and professional organizations. Such anniversary pieces contextualize advancements in orthopaedics over half a century and reflect on the discipline’s evolution.