Final answer:
The weak muscle associated with pronation distortion is the tibialis anterior, which aids in dorsiflexion and inversion of the foot. The peroneus longus, gastrocnemius, and soleus muscles are typically not weak in this condition, but rather overactive or tight.
Step-by-step explanation:
The weak muscles associated with pronation distortion syndrome are typically those that are responsible for dorsiflexion and inversion of the foot. These would include the tibialis anterior, which is located in the anterior compartment of the lower leg and contributes to the lifting of the front of the foot. Weakness in the tibialis anterior often leads to overpronation of the foot, where the foot rolls inward excessively during walking or running.
On the other hand, the peroneus longus, gastrocnemius, and soleus muscles that are part of the lateral and posterior compartments of the leg, respectively, are typically not associated with being weak in pronation distortion. Instead, these muscles are often found to be overactive or tight in individuals with this condition. The peroneus longus everts the foot, and the gastrocnemius and soleus muscles are involved in plantar flexion of the foot.