Władysław I the Elbow-high of Kujawy, however, as he had two older half-brothers from Casimir’s second marriage to Constance of Wrocław: Leszek II the Black ("Leszek Czarny") and Ziemomysł. He was named after his uncle, his mother's brother Władysław, Duke of Opole. Already in contemporary sources he was nicknamed ""Łokietek"", a diminutive of the word "łokieć". It translates as "elbow" or "ell" – a medieval unit of measure similar to a cubit, as in "elbow-high". The origin of this nickname, as resulting from Władysław’s short stature, was explained only in the 15th century by historian Jan Dlugosz. In 1267, when Władysław the Elbow-high was
Ulnar collateral ligament injury of the elbow and extension. The posterior oblique originates at the medial epicondyle and inserts along the mid-portion of the medial semilunar notch. It applies more stability against valgus stress when the elbow is flexed rather than extended. The transverse ligament connects to the inferior medial coronoid process of the ulna to the medial tip of the olecranon. Since it is connected to the same bone and not across the elbow joint, the transverse ligament has no contribution to the joint’s stability. In most cases, a physician will diagnose an ulnar collateral ligament injury using a patient’s medical history and a physical examination