Muscular branches of posterior tibial artery

The muscular branches of the posterior tibial artery are a series of arterial branches that arise from the posterior tibial artery along its course in the posterior compartment of the leg, providing blood supply to the deep muscles of the posterior leg.

Origin and Course

The posterior tibial artery is one of the two terminal branches of the popliteal artery, arising at the lower border of the popliteus muscle. As it descends through the deep posterior compartment of the leg — between the superficial and deep muscle groups — it gives off multiple muscular branches (also called perforating branches) at various levels.

Muscles Supplied

The muscular branches of the posterior tibial artery supply the following muscles of the posterior compartment of the leg:

• Soleus — The medial part of the soleus receives perforators from the posterior tibial artery throughout its entire length, making it a reliable and constant vascular supply. The lower perforators arise at average distances of approximately 6.5 cm, 11.6 cm, and 16.8 cm from the medial malleolus.

• Medial gastrocnemius — Receives direct arterial supply from the posterior tibial artery.

• Tibialis posterior — Supplied by muscular branches from the posterior tibial artery in the deep posterior compartment.

• Flexor digitorum longus — Receives branches as the posterior tibial artery courses between the deep posterior muscles. Approximately 64% of posterior tibial artery perforators run between the soleus and the flexor digitorum longus muscle, and 12% between the tibia and the flexor digitorum longus.

• Flexor hallucis longus — Supplied by branches from the posterior tibial artery in the distal leg.

Types of Branches

The muscular branches can be classified by their course through the tissues:

• Musculocutaneous perforators — pass through the muscle belly before reaching the skin; the majority (78.6%) are located in the middle third of the leg.

• Septocutaneous perforators — travel through the intermuscular septa; most (55.3%) are found in the distal third of the leg.

• Septomusculocutaneous perforators — a less common variant that traverses both septa and muscle.

On average, approximately 5–6 perforators per leg arise from the posterior tibial artery, with a mean diameter of approximately 1.0 mm. The largest and longest perforators are found in the proximal third of the leg (mean diameter ~1.4 mm, mean length ~9.1 cm), with size decreasing distally.

Clinical Significance

Knowledge of these muscular branches is essential for the design of soleus muscle flaps and posterior tibial artery perforator flaps used in reconstructive surgery of the lower limb. The constant vascular supply to the medial soleus from the posterior tibial artery makes it a reliable option for both proximally and distally based flaps. Additionally, understanding the distribution of these branches is important for avoiding iatrogenic vascular injury during medial ankle and tarsal tunnel surgery.