Abstract: Objective: To analyze the low field MRI findings of the sharp instrument injury in the lower limb soft tissue.Methods: The low-field MRI data of 31 patients with the sharp instrument injury in the lower limb soft tissue were retrospectively analyzed.Results: Five cases of achilles tendon injury,3 cases of patellar ligament injury,2 cases of quadriceps tendon injury,2 cases of iliotibial band injury,1 case of medial collateral ligament injury and 1 case of lateral collateral ligament injury were diagnosed using MRI.MRI imagings of tendon ligament showed local high signal in 4 cases and discontinuity in 10 cases,together with adjacent soft tissue swelling.The imaging of 14 cases with muscle contusion and hematoma showed the subcutaneous and intramuscular edema,muscle fascia and muscle tear,together with muscle interstitial fluid and intramuscular nodular lesions in hematoma case.The imaging of 7 cases with sharp injury in subcutaneous loose connective tissue space showed low T1 and high T2 signal regions,which was consistent with injury.Conclusions: MRI is an important non-invasive examination method to evaluate the sharp instrument injury of the lower limb soft tissue.