Several sources argue that arthritis alone confined Barrymore to a wheelchair. Film historian Jeanine Basinger says that his arthritis was serious by at least 1928, when Barrymore made "Sadie Thompson". Film historian David Wallace says it was well known that Barrymore was addicted to morphine due to arthritis by 1929. A history of Oscar-winning actors, however, says Barrymore was only suffering from arthritis, not crippled or incapacitated by it. Marie Dressler biographer Matthew Kennedy notes that when Barrymore won his Best Actor Oscar award in 1931, the arthritis was still so minor that it only made him limp a little as he went on stage to accept the honor. Barrymore can be seen being quite physical in late silent films like "The Thirteenth Hour" and "West of Zanzibar", where he can be seen climbing out of a window.