Background: The majority of extra capsular (trochanteric and sub trochanteric) types of fracture patients are elderly with comorbidities and there is a strong association with osteoporosis and the management of these patients is associated with a huge risk for medical and surgical complications. And also we are aware that the difficulty of treating trochanteric and sub trochanteric fractures stems in part from the fact that this injury pattern is anatomically distinct from other proximal femoral peritrochanteric fractures and in part from the difficult features of femoral shaft fractures and also the surrounding strong muscle forces deform the fracture fragments and make reduction difficult. So the present study was planned to evaluate the functional results of these femur fractures treated with proximal femoral nail. Research Question: What is the functional outcome of trochanteric and sub trochanteric fractures treated with Proximal femoral nail? The setting of the study was at department of Orthopedics, Government General Hospital, Government Medical College, Machilipatnam, Andhra Pradesh. A one year observational study was conducted during the period from October 2022 to September 2023 on about 25 trochanteric and sub trochanteric fracture patients admitted during the above period in the department of Orthopedics by studying their socio-demographic profiles, associated risk factors, types of fracture reduction, postoperative complications and assessment of the degree of success of fracture reduction with clinical course and outcome, etc. Results: It was observed that female study subjects (56%) were more when compared to males (44%) and maximum number of patients were between 41 – 70 years of age group and the Mean age was 51.1 years. Regarding distribution of complications after surgery, shortening was observed among 12% of patients followed by Greater trochanteric splintering 8%, postop infection 8% and implant failure 4% respectively. With reference to fracture reduction closed reduction was 64% and 36% were limited open reduction and particular to evaluation of results of PFN implantation after surgery about 28% were identified as excellent followed by 40% good, 28% fair and about 4% poor as scored respectively.