After anterior cruciate ligament (ACL) reconstruction or partial meniscectomy, athletes are interrupted from articipate in a competition for a long period of time. An object of this study was to reveal a lack factor that can be conceived from a psychological and nutritional science point of view for athletes who have undergone an perational surgery due to injury in order to return to a sport by investigating, quantitatively monitoring and evaluating physical, psychological and nutrition assessment of the postoperative athletes. Three ACL injuries and two eniscus injuries (improvement group) and one meniscus injury (intractable group) were selected as the subjects among patients who went to the hospital for more than three months due to ACL or meniscus and who were suspended from participating a sport. Range of motion (ROM), questionnaire Profile of Mood States (POMS), Epidemiologic Studies Depression Scale (CES-D), and PSQI-J were measured for six subjects during a period of three month after the operation. In addition, Brief-type self-administered Diet History Questionnaire (BDHQ) was also easured for one subject in the improvement group and one subject in the intractable group. POMS, CES-D and ROM were improved for the improvement group and the calorie intake of BDHQ increased after the operational surgery. POMS and CES-D were not improved and BDHQ decreased, while ROM was not improved for the ntractable group. It was implied that the psychological and nutritional status of the postoperative athletes were required to be grasped and approached in order to early return to the sport.