Case report of unusual insertion of the fibularis brevis muscle

Kacper Ruzik,Karolina Westrych,Łukasz Olewnik,Piotr Karauda,Marko Konschake,R Shane Tubbs

doi:10.1007/s00276-022-02894-y

Abstract

The fibularis brevis and fibularis longus muscles belong to the lateral compartment of the leg. The fibularis brevis is morphologically variable, especially in the number of tendons and place of insertion. Its type of insertion is correlated with the presence of a fibularis digiti quinti, which is also anatomically variable. We present a case study based on dissection of a seventy-three-year-old female cadaver with an unusual insertion of the fibularis brevis muscle. The tendon had three bands inserting into the fifth metatarsal bone. There was a coexisting fibularis digiti quinti, which was fused with the fibularis tertius muscle. Awareness of such anatomical variation could be useful during reconstructive surgery and planning rehabilitation protocols.

Highlights

The fibularis brevis (FBM) is a slender muscle in the lateral compartment of the lower leg
The fibers of the muscle belly merge into the fibularis brevis tendon (FBT)
Macalister et al described a slip band of origin to the abductor digiti minimi and another slip band joining to the fibularis longus tendon as an insertion variant, and two fibularis united in a deformed limb found by Ringhoffer [12, 18]

Summary

Introduction

The fibularis brevis (FBM) is a slender muscle in the lateral compartment of the lower leg. Olewnik et al proposed a new twofold classification of FBM insertion in adults (types 1 and 2) [16].The FBM is important for the motor functions of the foot, assisting in its flexion and in eversion of the inner portion of the foot. Each of these movements helps to keep the body balanced during walking on uneven surfaces [8]. That connection was observed in the aforementioned classification but it always correlated with

Findings

Discussion

Conclusion