Knee dislocation??not sure

Patient: Dislocation or Subluxation of the knee.when i was 18 kinda jump and land awkwardly with my left knee,and i can feel the splitting of something in between my knee,im not sure what is it,but it hurt so bad like im laboring,the x ray show nothing dislocate on my bone,cant bend or straighten my knee

Symptoms: For years wont heal,once hurt can’t straighten or bend my leg,feel like something in between some big bump blocking,at usual time,when walk to much it feel sore on my left knee