Background: Brachial plexus lesions result in a disconnection of the upper limb nerves from the spinal cord and brain.This study was conducted to assess the impact of pre surgical delay on functional outcome after reconstruction of brachial plexus injuries. Material and Methods: Surgery for TBPI had been performed on one hundred individuals. Everyone suffered injuries to their complicated plexus. Twenty-one subjects out of hundred subjects had nerve grafting to the upper trunk in order to improve the function of their biceps as well as shoulders. The rest seventy-nine subjects had been disqualified because they either had partial upper trunk injuries, direct repairs, or nerve or tendon transfers. The subjects were aged from 15-55 years. In every instance, the brachial plexus had been exposed via the transclavicular, infraclavicular, or supraclavicular methods. After exposure, an evaluation of the extent and kinds of lesions observed was conducted. A lesion preventing proximal neural input into the upper trunk was present in all twenty-one individuals. Nerve grafts had been positioned between the upper trunk as well as the accessible roots, which were determined using intraoperative nerve conductivity testing. The superficial radial as well as sural nerves were among the donor nerves. Statistical analysis was conducted using SPSS software. Results:Out of the twenty-one participants in the present investigation, sixteen were men and five were women, with ages ranging from 15 to 55 years. Motorcycle accidents were the main aetiology of brachial plexus injury. Road traffic accidents including drivers, passengers, as well as pedestrians were among the additional causes. The duration of the follow-up was two to six years. The twenty-one patients were split up into three groups: 0–2 weeks post-injury, 2 weeks–2 months, and >2 months post–injury. The first and second group comprised of 9 subjects each and the third group comprised of 3 subjects. Compared to 5 subjects in the 2 weeks-2 months group, 6 individuals in the <2 weeks group had "good" results (M4/5). In the >2 months group, only 1 individual had a satisfactory outcome, and most individuals only regained MRC grades