Differential Diagnosis for Simple Fracture in the Distal Metadiaphysis of the Left Radius with Narrowed Radiocarpal Joint Space
- Single Most Likely Diagnosis
- Colles' fracture with secondary osteoarthritis: This is the most likely diagnosis given the location of the fracture and the narrowed radiocarpal joint space, which could be due to pre-existing osteoarthritis or a complication of the fracture.
- Other Likely Diagnoses
- Intra-articular fracture of the distal radius: Although the question specifies a simple fracture, the involvement of the radiocarpal joint space suggests possible intra-articular extension, which would complicate the fracture.
- Rheumatoid arthritis: This condition can cause narrowing of the joint space and increase the risk of fractures due to bone weakening.
- Osteoporotic fracture: Osteoporosis can lead to fractures with minimal trauma and may also contribute to the narrowing of the joint space due to bone resorption.
- Do Not Miss Diagnoses
- Infection (osteomyelitis or septic arthritis): Although less likely, infection can cause joint space narrowing and must be considered, especially if there are signs of infection such as fever, redness, or swelling.
- Malignancy (e.g., metastatic bone disease): Malignancies can weaken bones, leading to fractures, and can also cause joint space narrowing due to tumor invasion.
- Rare Diagnoses
- Osteonecrosis of the distal radius: This is a rare condition that could potentially cause a fracture and joint space narrowing.
- Neuropathic arthropathy: This condition, often associated with diabetes or other neuropathies, can lead to joint destruction and fractures but is less common in the wrist.