We report on a patient with hip and elbow dislocations, joint hyperextensibility, peculiar facial appearance, torticollis, cryptorchidism, unilateral hexadactyly, and other minor anomalies. Cultured cells from this patient produce less type I procollagen and have a slower rate of processing of type I procollagen to collagen in the culture medium. We think that the pattern of clinical anomalies constitutes a previously unreported syndrome with type I procollagen defect as a manifestation of the syndrome.