Bone grafting is a widely employed surgical procedure wherein the bone transplanted from a donor is used as a substitute for defect or damaged site. Bone for grafting can be harvested from various locations such as ribs, skull, pelvis, femur, tibia, etc. The pelvis is widely regarded as the golden standard for bone extraction owing to the abundance of corticocancellous bone. However, the process of bone extraction is often accompanied by various post graft complications and potential risks that cause pelvic instability. The present study aimed to develop a non-invasive finite element method by which the physician can determine the suitable location to extract the bone without compromising the mechanical integrity of the pelvis. As a measure, stress developed after harvesting the bone in four different patterns namely, rectangle, triangle, circle, and ellipse were compared to identify the most appropriate pattern that would result in lesser complications. As a procedure, a three-dimensional model of the pelvis was constructed using a computed tomography data sets and analyzed using Abaqus® software. The model was subjected to a body load of 600N considering single leg stance. The results revealed that stress developed was higher at iliac crest (4.32 MPa) when harvested in triangular window pattern. Circular pattern of bone harvesting was associated with lesser stress at iliac crest (2.05 MPa) followed by elliptical (2.49 MPa) and rectangular patterns (2.93 MPa). The outcomes of this study can be used to prevent post-harvest complications in pelvis without compromising the mechanical strength.