Fibularis Longus Tendon Groove On The Cuboid Bone, Inferior View

Description

Cuboid bone dominates the plantar (inferior) aspect of the lateral midfoot, with a prominent fibularis (peroneus) longus tendon groove coursing obliquely across its inferior surface. From this fixed inferior perspective, the sulcus appears as a deep channel running from the lateral plantar margin toward a more medial and anterior position, aligning with the tendon’s route as it turns sharply under the cuboid to cross toward the first ray. The groove lies distal to the calcaneus and proximal to the bases of the fourth and fifth metatarsals, a relationship that helps orient the viewer to the calcaneocuboid joint region and the lateral column of the tarsus. Clinically, the plantar groove on the cuboid is the bony track that guides the fibularis longus tendon through a high-friction turn, a common site for tenosynovitis, longitudinal split tears, and painful impingement when an os peroneum is present within the tendon. Pathology here can mimic lateral midfoot sprain or “cuboid syndrome,” and surgeons exploring persistent lateral plantar pain often localize tenderness near the peroneal groove and calcaneocuboid joint line. The inferior-only viewpoint supports teaching because it isolates the exact bony contour that forms the tendon pulley, letting you correlate the sulcus depth and orientation with expected tendon contact and wear patterns. Use this illustration in foot and ankle anatomy labs, orthopedic and podiatry lecture decks covering peroneal tendon disorders, and surgical education materials describing plantar lateral approaches around the cuboid and calcaneocuboid joint. It also fits radiology and sports medicine references when explaining why ultrasound or MRI signal changes in the fibularis longus tendon often cluster at the cuboid tunnel. Anatomical accuracy verified by SciePro's Medical Advisory Board.