The nurse is discussing types of treatment used when working with children who have orthopedic disorders. Which form of treatment covers the lower part of the body, usually from the waist down, and either one or both legs while leaving the feet open?

Choice A reason: External fixation devices use pins and frames to stabilize bones externally, not covering the body like a cast. A spica cast encases the lower body, leaving feet open, making this incorrect for the treatment described in pediatric orthopedic care for lower body immobilization in children. Choice B reason: Stockinette is a soft fabric used under casts for comfort, not a treatment covering the body. A spica cast fits the description of encasing the waist and legs, leaving feet open, making this incorrect for the specific orthopedic treatment discussed for children with disorders. Choice C reason: Internal fixation devices, like plates or screws, are surgical implants, not external body coverings. A spica cast matches the description of covering the lower body with open feet, making this incorrect for the treatment used in pediatric orthopedic disorders requiring immobilization. Choice D reason: A spica cast covers the lower body from the waist down, including one or both legs, while leaving the feet open, used for pediatric orthopedic conditions like hip dysplasia. This aligns with treatment descriptions, making it the correct choice for the question about orthopedic care.