Objective To analyze the treatment outcome of the two methods of intra-capsular injection of temporomandibular joints, the upper capsule alone and both the upper and lower capsules, for different subtypes of temporomandibular disorders. Methods Aretrospective cohort studywas designed, based on the outpatients and the datawhichwere obtained fromWest China Stomatological Hospital, SichuanUniversity. SPSS10.0 software was used to analyze the data, whichwere collected before the op- eration and one week after the operation.Results 294 patients were followed up. The group of double capsules injection gained better prospect, not only on the mouth-opening but alsothe pain-cured, especially in two subgroups such as the anterior dislocation of disc without reduction and the osteoarthritis ofTMJ.Conclusion It seems that the double capsules injection of sodium hyalur- onate forTMD can gain better outcome than the upper capsule injection, but a clinical randomized controlled test and a long-term follow-up study of the two methods are needed to verify this finding.
