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Background and objective  Nutrient foramina in supracondylar, medial condyle, lateral condyle, and intercondylar fossa have been described in the literature. The author of the present study observed a vascular foramen on the trochlear groove, which has not been previously reported in the literature. The aim of the study was to elaborate on the morphology, morphometry, and associated clinical implications of this foramen.  Materials and methods  Forty-five unpaired femora of unknown sex available in the Department of Anatomy at the Uttar Pradesh University of Medical Science (UPUMS), Saifai, India were observed to examine the incidence, shape, size, and location of the foramen on the trochlear groove of the distal femur. The incidence and shape were observed and its location in relation to the upper and lower articulating margin of the patella was recorded using a divider and scale.  Results  The trochlear foramen was observed in 25 femora, accounting for 55.6% of the total. The average diameter of the foramen was 4 mm. The average distance of the foramen from the upper patellar articulating surface was 2.4 cm and its distance from the lower margin was 0.7 cm. All the foramina were round in shape. The largest number of foramina were located in the midline, and seven foramina were located to the left of the midline of the trochlear groove.  Conclusions  The incidence of the trochlear foramen was 55.6%, meaning that more than half of the population possess this foramen on the trochlear groove. The maximum number of these foramen, amounting to 64%, were found in the midline of the trochlear groove. The morphologic and topographic knowledge of the trochlear foramen is essential for orthopedic surgeons during operative procedures in the region of the distal femur.

Morphometry and Morphology of Vascular Foramen on the Trochlear Groove of the Distal Femur and Its Implications