The triceps surae represents the combined muscle-tendon unit of the two gastrocnemius heads and soleus, converging into the Achilles tendon. The musculotendinous junction is where most acute calf muscle tears occur (medial gastrocnemius at the musculotendinous junction — tennis leg). The combined plantarflexion power of the triceps surae is the largest single muscle contribution to forward propulsion in gait.
Combined plantarflexion power for walking, running, and jumping; elastic energy storage and release in gait
The triceps surae unit is assessed by single-leg heel rise test — the ability to perform 25 consecutive single-leg heel rises is the clinical benchmark for normal plantarflexion power. Failure indicates significant gastrocnemius-soleus weakness or Achilles tendon pathology. Eccentric calf loading in the form of the single-leg decline squat (Alfredson protocol) is the gold standard rehabilitation for mid-portion Achilles tendinopathy.
Gastrocnemius-soleus power deficit producing single-leg heel rise failure managed with progressive strengthening including the Alfredson eccentric protocol for Achilles tendinopathy.
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