 [ Symptoms ] i injured my leg in car accident pain when i get up from sitting and after standing [ Disease ] you are mostly suffering a posterior horn of medial meniscial tear it could happen after accidents or direct blunts of knees i recommend seeing a physiotherapist or follow a program of strengthening quadriceps and stretching of hamstring muscles knee mobilization a knee mri can prove it also if your knee gives way or locks can be confirming signs without mri