Fibularis Longus Tendon Groove On The Cuboid Bone, Medial View

Description

Fibularis (peroneus) longus tendon sulcus on the cuboid is the focal landmark, viewed from the medial aspect of the tarsus. The groove tracks anteromedially across the plantar surface of the cuboid, passing anterior to the cuboid tuberosity and defining the bony pulley where the tendon turns from the lateral foot toward the midfoot. Adjacent articular margins of the calcaneocuboid joint lie posteriorly, while the distal cuboid facets for the fourth and fifth metatarsal bases sit more anterior and lateral in the same frame. Bone surface texture is crisp. That oblique plantar turn matters clinically because friction, stenosis, or synovitis at the cuboid groove can present as lateral midfoot pain in runners and dancers, and it is a frequent point of pathology when an os peroneum is present within the fibularis longus tendon. The fixed medial perspective makes the relationship between the sulcus and the cuboid tuberosity unambiguous, which helps when teaching how the tendon’s course stabilizes the lateral column and supports the transverse arch via its distal insertion on the base of the first metatarsal and medial cuneiform. A small groove, big consequences. Use this illustration in gross anatomy labs and lower-limb musculoskeletal teaching blocks to anchor discussions of the peroneal tendons, the calcaneocuboid joint, and cuboid fractures involving the plantar cortex. It also suits operative and sports-medicine publications addressing fibularis longus tendinopathy, os peroneum syndrome, and surgical exposure along the lateral midfoot. Anatomical accuracy verified by SciePro's Medical Advisory Board.