Anatomical Study of the Supratrochlear Foramen on the Distal Humerus

Aim: Supratrochlear foramen (STF) is the variation of the distal part of the humerus. The aim of this study is to reveal the frequency, morphology and morphometry of the STF in Turkish population and compare with previous studies. Materials and Methods: This study was performed with 116 dry humeri (61 right, 55 left). The translucent and opaque bony lamina between the coronoid fossa and the olecranon fossa and STF on the humerus were noted. STF was classified as oval, round, irregular, triangular, rectangular, sieve like, reniform, hourglass shaped. The frequency and morphometry of the STF were also evaluated. Results: The translucent type 88 (75.9%) bony lamina was found mostly between the coronoid and olecranon fossa. STF was detected on 19 (16.4%) humeri, 13 of them were on the left humeri and 6 of them were on the right humeri. The shape of the 16 of 19 STF were oval shaped. The mean values of the transverse and vertical diameter of STF, distance between the most medial points of the STF and medial epicondyle, the most lateral points of the STF and lateral epicondyle, distance between the most distal point of the STF and the lower edge of the trochlea humeri were found as 4.41±2.34 mm, 3.1±0.85 mm, 26.65±3.82 mm, 27.94±3.34 mm, 14.62±1.9 mm respectively. Conclusion: There are few studies on STF in Turkish population and we believe that this clinically important variation will contribute to anatomists, especially radiologists and orthopedists, in terms of awareness and knowing the frequency, morphology and morphometry of STF. Amaç: Supratrochlear foramen (STF), humerusun distal bölümü ile ilişkili bir varyasyonudur. Bu çalışmanın amacı, Türkiye toplumunda STF'nin sıklığını, morfolojisini ve morfometrisini ortaya koymak ve önceki çalışmalarla karşılaştırmaktır. Gereç ve Yöntem: Bu çalışma 116 kuru humerus (61 sağ, 55 sol) ile yapıldı. Fossa coronoidea fossa olecrani arasındaki yarı saydam ve opak kemik lamina ve STF bulunan humerus’lar not edildi. STF; oval, yuvarlak, düzensiz, üçgen, dikdörtgen, elek benzeri, böbrek şekilli, kum saati şeklinde sınıflandırıldı. STF'nin bulunma sıklığı ve morfometrisi değerlendirildi. Bulgular: Fossa coronoidea fossa olecrani arasındaki kemik lamina en çok yarı saydam tip olarak bulundu 88 (%75,9). STF 19 (%16,4) humerus’ta tespit edildi ve bunların 13'ü sol humerusta, 6'sı sağ humerusta idi. Ondokuz STF'nin 16'sı oval şekilli idi. STF'nin transvers ve vertikal uzunluğu, STF'nin en medial noktası ile epicondylus medialis’