Prognosis Analysis Of Lateral Discoid Meniscus Injury Under Different Operation Procedures In The Knee Joint Of Children

Objective: By comparing preoperative and postoperative magnetic resonance imaging(MRI)and clinical function of lateral discoid meniscus(LDM),this study can provide a reference for the clinic that which kind of surgical procedure should be chosen.Methods: Fifty-six knees from January 2007 to December 2016 in our hospital with LDM injury diagnosed by A senior physician of pediatric orthopedics.According to different surgical procedures,Group A was a total of 31 knees(55.4%)with partial meniscectomy and anterior horn(AH)suturing under the arthroscopy,Group B was a total of 25 knees(44.6%)with partial meniscectomy under the arthroscopy.Patients aged from 4 to 13 years old,with an average of(8.14±2.29)years old.All MRI were double-blinded,independently,retrospectively analyzed by a professor of pediatric orthopaedics(doctor A)and resident doctors(doctor B,C).By comparing the preoperative and postoperative MRI and Lysholm scores of two groups,we can analyze the clinical efficacy of arthroscopic treatment of LDM injury.Results: There are 56 knees with LDM injury diagnosed by preoperative MRI and arthroscopy,whose clinical data was complete.The patients were followed up at least 6 months.Preoperative and postoperative index of both groups were taken from the last data.The ratio of thickness of the free margin to the central part of the DM,the ratio of thickness of the lateral margin to the central part of the DM,the ratio of width of the body of the DM to the tibial plateau of the DM and Lysholm scores were significantly changed between preoperation and postoperation(p<0.05).There are no significant differences in the ratio of thickness of the free margin to the central part of the DM,the ratio of thickness of the lateral margin to the central part of the DM and the Lysholm score in the two groups after the operation(p>0.05).Conclusion: No matter which type of operation was taken in the LDM injury of the knee joint,a triangular form of a meniscus which is close to the normal meniscus can be observed in coronal MRI after 6 months,which can reduce the risk of recurrence of LDM injury.The postoperative clinical functions were significantly improved.The anterior horn fixation isn’t necessary in the large activity degree of the anterior horn(AH)of the LDM.