Abstract：Objective To measure a tibial tuberosity-trochlear groove (TT-TG) distance of adolescents with epiphyseal non-closure by computed tomography (CT)，for the establishment of TT-TG parameters values and providing reference for diagnosing and treating patellar instability patients.Methods 50 healthy adolescent volunteers (12 to 16 years old) in Xinjiang were recruited for the CT measuring on knee joints for，and the general information，physical examination and CT data were analyzed.We compared the TT-TG among adolescents with epiphyseal closure and non-closure and the patients with patellar instability.Results It was found that 32 healthy adolescents with epiphyseal non-closure and 16 adolescents with epiphyseal closure were included the 50 volunteers after screening，but 2 volunteers were ruled out.Each of them was scanned both knee joints.The TT-TG of healthy adolescents with epiphyseal non-closure were higher than that with the epiphyseal closure group，but with no significantly difference (P＞0.05).There are no significant difference between the two measurers for the TT-TG measuring of the same people (P＞0.05).There are no significant difference between males and females in the adolescents with epiphyseal non-closure group (P＞0.05).Compared with the healthy adolescents with epiphyseal non-closure，TT-TG of patellar instability patients with both epiphyseal non-closure and epiphyseal closure were higher (P＜0.05).Among the patellar instability patients，TT-TG in the epiphyseal non-closure group were significantly higher than that in the epiphyseal closure group (P＜0.05).The probability of patellar instability in healthy adolescents with epiphyseal non-closure was higher than that in healthy adolescents with epiphyseal closure (P＜0.05).The probability of undergoing surgery for patellar instability patients with epiphyseal non-closure was higher than that with epiphyseal closure (P＜0.05).Conclusion Epiphyseal non-closure can enhance the prevalence of patellar instability.Our study preliminary showed the TT-TG parameters values of adolescents with epiphyseal non-closure，and it has a crucial clinical reference for diagnosing and treating patellar instability patients.
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