Which foot deformity is commonly observed in individuals with low lumbar spina bifida?

Which foot deformity is commonly observed in individuals with low lumbar spina bifida?

• A. Convex pes valgus or rocker bottom foot with a vertical talus
• B. Pes planus
• C. Hindfoot valgus
• D. Clubfoot

Answer: (A)

In low lumbar spina bifida, the muscles that normally stabilize the foot and ankle are weakened, leading to a characteristic pattern of foot deformity. The most commonly observed form is convex pes valgus with a rocker-bottom appearance caused by a vertical talus. Weakness and imbalance allow the talonavicular joint to collapse, so the talus sits in a more vertical position and the forefoot moves into valgus, producing a sole that appears convex. This combination—rocker-bottom foot with a vertical talus and hindfoot valgus—is more typical for lower-level spinal lesions, making it the standout deformity associated with this condition. Other foot deformities like pes planus or clubfoot can occur, but they are not as specifically linked to low lumbar spina bifida.

In low lumbar spina bifida, the muscles that normally stabilize the foot and ankle are weakened, leading to a characteristic pattern of foot deformity. The most commonly observed form is convex pes valgus with a rocker-bottom appearance caused by a vertical talus. Weakness and imbalance allow the talonavicular joint to collapse, so the talus sits in a more vertical position and the forefoot moves into valgus, producing a sole that appears convex. This combination—rocker-bottom foot with a vertical talus and hindfoot valgus—is more typical for lower-level spinal lesions, making it the standout deformity associated with this condition. Other foot deformities like pes planus or clubfoot can occur, but they are not as specifically linked to low lumbar spina bifida.