A nutrient foramen or vascular channel are small tunnels in the cortex of long bones that contain nutrient arteries that contribute to the blood supply of the bone.
The foramina are known to mimic oblique fractures on plain radiographs 1. The nutrient artery enters a long bone via an obliquely orientated canal, that can appear as a radiolucent line passing through the cortex into the medullary portion of the diaphysis of the bone. They are often observed with a well-corticated edge 1. The direction of the oblique canal is relative to the rate of growth occurring at both ends of the long bone 2.
Although not all nutrient foramina will be visible in plain radiography, it is important to know the frequency in which they occur.
- majority of humeri possess a single nutrient foramen 2. However, humeri with two 2,3 or no 4 foramina have been reported.
- up to 99% of radii have a single foramen 2, again with some studies cited two or none 3.
- the ulna regularly presents with a single foramen, with as many as three cited in anatomical studies 5.
- studies regarding the nutrient foramen of the femur range from one to as many as nine 6.
- the tibia primarily possesses nutrient foramina on the posterior aspect of the diaphysis; with a single foramen most common 2.
- the fibula most commonly possesses a single foramen however as many as three has been reported 2,3.
- the phalanges typically possess a single foramen however the proximal phalanges of the fingers commonly have two, with all foramina directed away from the origin of bone growth 7 .
- 1. David Schwartz. Emergency Radiology: Case Studies. ISBN: 9780071593090
- 2. Kizilkanat E, Boyan N, Ozsahin ET, Soames R, Oguz O. Location, number and clinical significance of nutrient foramina in human long bones. Annals of anatomy = Anatomischer Anzeiger : official organ of the Anatomische Gesellschaft. 189 (1): 87-95. doi:10.1016/j.aanat.2006.07.004 - Pubmed
- 3. Longia G.S., M.L. Ajmani, S.K. Saxena and R.J. Thomas. "Study of diaphyseal nutrient foramina in human long bones". Cells Tissues Organs 107, no. 4 (1980): 399-406. . doi:10.1159/000145267
- 4. G.S. Longia, M.L. Ajmani, S.K. Saxena, R.J. Thomas. Study of diaphyseal nutrient foramina in human long bones. Cells Tissues Organs. 107 (4): 399. doi:10.1159/000145267
- 5. Shulman S. S. "Observations on the nutrient foramina of the human radius and ulna". The Anatomical Record 134, no. 4 (1959): 685-697. . doi:10.1002/ar.1091340404.
- 6. Sendemir E and A Çimen. "Nutrient foramina in the shafts of lower limb long bones: Situation and number". Surgical and Radiologic Anatomy 13, no. 2 (1991): 105-108. . doi:10.1007/bf01623881.
- 7. Mysorekar V. R. and A. N. Nandedkar. "Diaphysial nutrient foramina in human phalanges". Plastic and Reconstructive Surgery 65, no. 4 (1980): 542. . doi:10.1097/00006534-198004000-00084.
- anatomic position
- anatomic variants
- regional anatomy
- systems anatomy
- macroscopic structure
- microscopic structure
- bone growth
- bones types
- nutrient foramen
- blood vessels