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This study evaluated the MRI signal characteristics and MRI diagnostic accuracy in identifying completely healed menisci repaired with bioabsorbable arrows. A total of 34 patients (38 menisci), with a mean age of 26.0 years, underwent arthroscopic meniscal repair with bioabsorbable arrows and concomitant anterior cruciate ligament (ACL) reconstruction. Of the 34 patients, 27 were male and 7 were female. Of the 38 menisci, 27 were medial and 11 were lateral. Second-look arthroscopy was performed for each patient while taking out the hardware for ACL reconstruction of the tibial side to evaluate the healing status of the repaired menisci. Postoperative MRI was done 2 days before or after second-look arthroscopy. Sagittal T1, T2 and PD images and coronal T2 and PD images were used as the main diagnostic serials. Second-look arthroscopy showed that surfaces of the repaired sites of all 38 menici were almost smooth. In all 38 cases the tail ends of meniscus arrows disappeared and in four patients new overlying injury of compartmental cartilage at the repaired side was detected. MRI results revealed that different serials had different diagnostic accuracy. Sagittal: T1 28.9%, PD 34.2%, T2 60.5%. Coronal: PD 36.8%, T2 65.8%. The double sides Grade 3 signal had a higher proportion in saggital T1 and PD serials, 47.4 and 39.5%, respectively, while lower in sagittal and coronal T2 serials, both 5.3%. MRI diagnostic accuracy was correlated positively with the follow-up time (P< 0.05). MRI has its limitation in evaluating the status of menisci repaired with bioabsorbable arrows, especially for PD and T1 serials. T2 serials have higher diagnostic accuracy than other serials. MRI diagnostic accuracy can be improved by prolonging follow-up time and might be improved by further classifying Grade 3 signal in terms of signal intensity and the shape of the signal margin.

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Background: Synovial chondromatosis (SC) is a relatively rare disease and there were few studies on causes and clinical outcomes of revision surgery for SC. The purpose of this study was to evaluate clinical outcomes of revision hip arthroscopy for synovial chondromatosis.Methods: We evaluated consecutive patients who underwent revision hip arthroscopy for SC in our hospital between January 2008 and January 2020. Radiographic evaluation was made before and after surgery. Preoperative patient-reported outcomes (PROs) and PROs at final follow-up were obtained, including visual analog scale (VAS) for pain, the International Hip Outcome Tool-12 (iHOT-12) and modified Harris Hip Score (mHHS).Results: A total of 8 patients (mean age, 39.5 years; age range, 27-62 years; 5 males and 3 females) were included in this study. The recurrence rate of hip SC in our hospital was 6.8%. The average follow-up period after surgery was 47.3 months (range, 12–120 months). Before surgery, mean mHHS was 60.6±17.3 (range, 20-77), mean iHOT-12 was 43.8±13.7 (range, 18-69), and mean VAS was 3.1±1.7 (range, 1-7). At the final post-operative follow-up, mean mHHS was 83.8±16.6 (range, 43-91), iHOT-12 was 80.6±19.7 (range, 32-90), and mean VAS was 0.6±1.8 (range, 0-5). All results demonstrated statistically significant improvement (P < 0.05). Recurrence of SC was found in 2 patients 1 year and 4 years after revision hip arthroscopy, respectively.Conclusion: Hip arthroscopy had good clinical outcomes for revision surgery of SC.

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