Final answer:
Helen's history of a minor fall, osteopenia, and prolonged steroid use for SLE suggests that a compression fracture is the likely serious underlying condition causing her low back pain.
Step-by-step explanation:
Helen, age 74, with a history of a minor fall, osteopenia, and long-term steroid use for systemic lupus erythematosus (SLE), presents with low back pain. These factors suggest a high possibility for a compression fracture as the serious underlying condition causing her pain. Steroid use and osteopenia contribute to decreased bone density and strength, which along with a history of a fall, significantly increases the risk of fractures, especially in the elderly.
Osteoporosis is a condition characterized by a reduction in bone mass and density, leading to an increased risk of fracture. In Helen's case, her lower bone density (osteopenia) could be a precursor to osteoporosis. Osteoporosis most often affects the vertebrae, wrists, and femur. Coupled with the long-term steroid use for her lupus, Helen's bones are likelier to be more fragile, making a compression fracture a probable diagnosis following a fall.