Final answer:
The etiology of a bed sore in a client with a spinal cord injury is due to excessive pressure on bony parts of the body, causing reduced blood flow and tissue necrosis, exacerbated by the patient's immobility and impaired sensation.
Step-by-step explanation:
The etiology of a client with a spinal cord injury who developed a bed sore, also known as a pressure injury, can be explained by excessive pressure on certain parts of the body. This constant pressure, especially on bony areas, reduces blood flow, leading to tissue death or necrosis. Patients with spinal cord injuries are often immobile, making them more susceptible to bed sores due to their inability to change position and relieve pressure.
Moreover, impaired sensation due to the injury can prevent the patient from feeling the pain that would normally signal the need to move. Hospitals and care facilities attempt to prevent bed sores by routinely turning patients to different positions.