Joint stiffness, which is one of the complications encountered after primary knee arthroplasty, is an important complication that decreases patient satisfaction and quality of life. Arthrofibrosis, infection, patellar complications, noncompliance of patients, heterotopic ossification, mistakes made in the surgical technique and component malposition constitute the majority of the etiology of joint stiffness. The main step in planning treatment is determining the underlying cause of joint stiffness. Manipulation under anesthesia, arthroscopic or open arthrolysis and revision arthroplasty are among the treatment options.