INTRODUCTION: The lower end of humerus has two articular facets, Trochlea and Capitulum. Trochlea takes part in formation of humero-ulnar joint by articulating with the trochlear notch of ulna. The shape of the Trochlea is in such a way that, it deviates the elbow to lateral side in extension and supination of forearm. Trochlear shape also plays an important role in determining the carrying angle.
OBJECTIVE: The objective of present study is to measure the various angles of Trochlea and compare the results with previous studies.
MATERIALS AND METHODS: Various angles of the Trochlea of the humerus were measured in 174 dried human humeri of unknown age and sex, in the Department of Anatomy, Mamata Medical College, Khammam, Telangana state.
RESULTS: Three types of trochlear shapes were observed. Flat lateral ridge (Type - 1) was observed in 55 bones. Small lateral ridge with shallow sulcus (Type - II) in 66 humeri and prominent lateral ridge with deep sulcus (Type - III) in 53 bones were observed. . The angles like Trochlear angle [TA], Trochlear sulcus angle [TSA], Capitillo-Trochlear angle [CTA], Inclination angle of olecranon fossa [IAOF] and Articular surface angle [ASA] were measured and statistically analyzed.
CONCLUSION: The study of various angles of Trochlea of humerus helps in proper surgical correction of the fractures of the lower end of the humerus. It helps in prevention of valgus and varus deformities during the correction of the fractures.
Trochlea of humerus, carrying angle, Trochlear angle, Trochlear sulcus angle, Capitillo-Trochlear angle