Traumatic fracture in a healthy man: benign or pathologic?

Area of Science:

• Medical diagnostics
• Genetics
• Orthopedics

Background:

• Osteopetrosis is a rare genetic disorder characterized by impaired osteoclast function, leading to dense but brittle bones.
• Differential diagnosis of recurrent fractures in adults can be challenging, especially when initial presentations mimic other bone conditions.

Observation:

• A 34-year-old man with a history of multiple fractures presented with a recent femoral fracture after a fall.
• Radiographic findings included osteosclerosis, diffuse bone-within-bone appearance, and obliteration of the medullary canal.
• Histopathology revealed normal bone marrow with woven bone, consistent with osteopetrosis.

Findings:

• The patient was diagnosed with autosomal dominant osteopetrosis type 2 based on clinical, radiographic, and histopathologic evidence.
• Initial suspicion of Paget's disease was ruled out, underscoring the importance of thorough diagnostic evaluation.
• Mildly elevated alkaline phosphatase was noted, but other laboratory tests were unremarkable.

Implications:

• Accurate diagnosis of osteopetrosis is crucial to avoid incorrect treatments and manage patient care effectively.
• This case emphasizes that rare genetic bone diseases can manifest in adulthood, necessitating consideration in adult fracture evaluations.
• Highlights the importance of integrating clinical, imaging, and pathological findings for diagnosing complex bone disorders.