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The myotome pattern associated with plantarflexion and hip extension is rooted in the innervation provided by the sacral nerves, specifically S1 and S2. These myotomes are primarily responsible for the muscles involved in these movements.

Plantarflexion is mainly controlled by the gastrocnemius and soleus muscles, which are innervated by the tibial nerve that branches from the S1 and S2 nerve roots. In addition, hip extension is caused primarily by the gluteus maximus, which is also influenced by the posterior divisions of the sacral plexus, including the S1 and S2 nerves.

When considering the combined movements of plantarflexion and hip extension, S1 is particularly significant as it is commonly regarded as the main contributor to these actions. Although S2 also plays a role, S1 is often highlighted in clinical scenarios for its influence on both movements collectively. Therefore, the correct answer reflects the primary myotome responsible for both plantarflexion and hip extension.