Differential diagnosis of Legg-Calvé-Perthes disease include all the following EXCEPT

Correct Answer: C

Rationale: Marfan syndrome, a connective tissue disorder, is not typically part of the differential for Legg-Calvé-Perthes, which involves osteonecrosis.

Correct Answer: A

Rationale: Type I osteogenesis imperfecta is the mildest form, with minimal deformity and frequent fractures.

Correct Answer: C

Rationale: Valgum refers to angulation toward the midline (e.g., knock-knees), as opposed to varum (away from midline). Cavus and equinus describe foot positions.

Correct Answer: C

Rationale: Cavus feet (high arches) are often linked to peripheral neuropathy, such as in Charcot-Marie-Tooth disease.

Correct Answer: D

Rationale: Tarsal coalition can lead to peroneal spastic flatfoot due to abnormal bone fusion.