Which muscle group tends to degenerate first generally in clubfoot?

Which muscle group tends to degenerate first generally in clubfoot?

• A. Intrinsics
• B. Brevis/Longus
• C. Triceps surae
• D. Peroneals

Answer: (A)

In clubfoot, the small muscles entirely within the foot—the intrinsic muscles—tend to waste away first. The deformity locks the foot in a rigid, plantarflexed and adducted position, markedly reducing the normal use and loading of these in-foot muscles. Because they’re chronically underused and operating in a stretched, abnormal framework, their fibers atrophy early, leading to loss of fine stabilization of the arches and toe control. The larger extrinsic muscles crossing the ankle, like the gastrocnemius-soleus group, are already driving or resisting the deformity through their longer leverage and tend to remain relatively preserved in terms of early degenerative changes, even though they’re often involved in the overall contracture. Peroneals may change as the foot’s alignment shifts, but their degeneration isn’t as early as that of the intrinsic group. Thus, intrinsic foot muscles are the first to degenerate in this condition.

In clubfoot, the small muscles entirely within the foot—the intrinsic muscles—tend to waste away first. The deformity locks the foot in a rigid, plantarflexed and adducted position, markedly reducing the normal use and loading of these in-foot muscles. Because they’re chronically underused and operating in a stretched, abnormal framework, their fibers atrophy early, leading to loss of fine stabilization of the arches and toe control. The larger extrinsic muscles crossing the ankle, like the gastrocnemius-soleus group, are already driving or resisting the deformity through their longer leverage and tend to remain relatively preserved in terms of early degenerative changes, even though they’re often involved in the overall contracture. Peroneals may change as the foot’s alignment shifts, but their degeneration isn’t as early as that of the intrinsic group. Thus, intrinsic foot muscles are the first to degenerate in this condition.