Background: Nutrient artery is the major source of blood supply to long bones. This artery enters the shaft of the long bone through nutrient foramen. Vascular insults to the Ulna during fracture dislocation or during surgical correction of fracture may result in delayed healing or non-union of fracture.Materials and Methods: The present study was undertaken on 100 dry adult ulna bones of unknown sex (50 each of right and left sides) from Department of Anatomy, Gadag Institute of Medical Sciences, Gadag, Karnataka. The ulna bones were numbered using a marker pen. Using Hepburn's osteometric board, length of the bone was measured. The size and direction of the nutrient foramina was assessed using 19, 22 and 25 gauge hypodermic needles.Results: Among the total 100 ulna studied, 86 had single nutrient foramina, 13 had two nutrient foramina and 1 had three nutrient foramina. 59.13% of nutrient foramina were of medium sized and 20% were of large size. 85.22% of nutrient foramina were located in upper third of shaft of ulna; 12.17% in middle third and 2.61% in lower third. 1% of NF were directed horizontally, 2% lower oblique and remaining upper oblique. No correlation could be demonstrated between the length of ulna and number of nutrient foramina in the present study. Conclusion:The present study conducted on nutrient foramina of 100 dry adult ulna arrived at a conclusion that majority of nutrient foramina were located in the upper third of the shaft in anterior surface. The results of the present study are consistent with most similar studies. The knowledge of location, direction and number of nutrient foramen on shaft of ulna is of utmost importance to the Orthopaedicians and Oncologists.

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Introduction: Different segments of radius present numerous vascular foramina (VF). The objective of the study was to quantify VF and note their size and direction. Methodology: One hundred dry human radii bones in our anatomy department were divided into various segments for studying VF. The number and direction of VF were evaluated in upper end (UE), shaft, and lower end (LE) separately. VF were categorized into three groups based on size, namely small (which admitted 25-gauge needle): 0.5–0.7 mm, medium (22-gauge needle): 0.71 mm to 1.10 mm, and large (19-gauge needle): >1.10 mm. The direction of foramina in each segment was noted. They were categorized into three types: horizontal, upper oblique, and lower oblique. Results: Significantly, a greater number of VF in the UE of radius were observed in the neck (average: 9.3 foramina) than in the radial tuberosity (average: 1.3 foramina). In the shaft, the maximum number of VF was observed in the anterior surface and minimum was found in the lateral surface. In the LE, the maximum number of VF was observed in the posterior surface (average 7.2 foramina) and minimum was found in the medial surface (average 1.6 foramina). In the UE of radius, 81.8% of VF were small sized. In the UE of radius, 62.8% of VF were directed horizontally. In the shaft, almost all (99%) VF were directed upper oblique. Conclusion: The present study concludes that different segments of radius have different densities of VF. The LE of radius has got more VF compared to UE indicating its rich vascularity.