%0 Journal Article %T A three-headed plantaris muscle fused with Kaplan fibers: potential clinical significance. %A Maślanka K %A Zielinska N %A Paulsen F %A Niemiec M %A Olewnik Ł %J Folia Morphol (Warsz) %V 0 %N 0 %D 2023 Nov 14 %M 37957936 %F 1.195 %R 10.5603/fm.95513 %X The plantaris is a short, small muscle that usually originates at the popliteal surface of the femur and has a long, thin tendon that typically inserts into the calcaneal tuberosity. Its role and degree of development have been objects of debate for years. Some authors consider it a vestigial muscle while others believe it is a process of its development. The clinical significance of plantaris muscle is usually related to its morphological variation, which is common and well described in the literature. These variations are often a risk factor for many ailments and disorders. We would like to present another, very rare case of three-headed plantaris muscle (fused with distal Kaplan fibers), and consider what clinical implications it may have.