Pes anserinus

The pes anserinus is the conjoined tendinous insertion of three muscles: the distal tendons of sartorius, gracilis, and semitendinosus. These tendons insert at the anteromedial aspect of the proximal tibia. These tendons are enveloped by aponeurotic membranes that fuse with the fascia cruris.

On the inner layer of the pes anserinus, between the periosteum of the tibia, is situated the superficial part of the medial (tibial) collateral ligament of the knee that may fuses with the pes anserinus.

The pes anserinus exhibits significant morphological diversity. According to the study by Olewnik et al., three primary types of insertion of the pes anserinus have been identified: short, band-shaped, and fan-shaped. [1]

1. Short Insertion: This type is characterized by a compact and localized insertion of the tendons onto the medial aspect of the tibia.

2. Band-shaped Insertion: In this type, the tendons form a more elongated and narrow band as they insert onto the tibia.

3. Fan-shaped Insertion: This type features a broader and more spread-out insertion pattern, resembling a fan.