Morphological Patterns of Linea Aspera on Human Femurs
Rohini M Pawar, Varsha N Mahavarkar
BACKGROUND - The linea aspera of femur is a prominent ridge on the posterior surface of shaft of femur. It helps for support and stabilization of the femur during walking and running. It serves for attachment site of several muscles. The linea aspera acts as a fixed anatomical landmark during the surgical procedure. It also acts as an important intraoperative landmark for orthopedic surgeons identifying the true posterior aspect of the femur. PURPOSE OF STUDY- 1) To determine the morphological variations of the linea aspera in human femurs. 2) To determine the number and location of nutrient foramina on shaft of femur in relation to linea aspera. RESULTS- Four different types of linea aspera to be determined: parallel (type I - 32%), concave (type II -42%), convex (type III-5%), and variform (type IV-21%).Amongst all, more mean length of linea aspera was found on convex type (9.92 cms). while, least mean length found on variform type (8.27cms.).Maximum number of femurs (60%) showed single nutrient foramina, while few number of femurs (2%) possesses triple nutrient foramina on its shaft. On 38% of femurs double nutrient foramina was found. More number of femurs (47%) showed nutrient foramina at the proximal end; while 5% of femurs showed foramina on the medial lip, rest 5% femurs showed on the lateral lip of linea aspera. CONCLUSION- The linea aspera possesses clinical significance for orthopaedicians, vascular surgeons, anatomist, anthropologists. It acts as an important anatomical guideline for proximal and distal femur endoprosthetic replacements. Knowledge about morphological variations of linea aspera may be helpful for appropriate clinical diagnosis. Such type of study may be useful during various orthopaedic surgeries.
Linea aspera, femur, morphological pattern