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Table 2 Comparisons of data in operative time, complications, Lysholm score, Rauschning-Lindgren grade, outcome of MRI scan and mean follow-up period between the AI group and the AICR group

From: Clinical outcome of arthroscopic internal drainage of popliteal cysts with or without cyst wall resection

  AI group (n = 20) AICR group (n = 22) P-value
Operative time (min) 39.6 ± 17.5 57.5 ± 19.3 < 0.05
Complications 1 4 < 0.05
 –Hematoma formation 1 3  
 –Extravasation under gastrocnemius muscle 0 1  
 –Poor wound healing 0 0  
 –Neurovascular injury 0 0  
 –Infection 0 0  
Preoperative Lysholm score 70.1 ± 10.2 71.2 ± 8.8 > 0.05
Postoperative Lysholm score 89.7 ± 6.8 90.1 ± 6.4 > 0.05
Preoperative Rauschning-Lindgren grade    > 0.05
 –Grade 0 0 0  
 –Grade I 2 2  
 –Grade II 8 9  
 –Grade III 10 11  
Postoperative Rauschning-Lindgren grade    > 0.05
 –Grade 0 15 16  
 –Grade I 3 4  
 –Grade II 2 2  
 –Grade III 1 0  
Outcome of MRI scan at the last follow-up    < 0.05
 – Disappeared 11 (55%) 18 (81.8%)  
 – Reduced 6 (30%) 4 (18.2%)  
 – Persisted (recurrence) 3 (15%) 0 (0%)  
Mean follow-up period (months) 24.6 ± 10.5 25.2 ± 9.6 > 0.05
  1. Rauschning-Lindgren grade: grade 0 = no pain and swelling, no range limitation; grade I = pain and swelling after intense activity, minimal range limitation; grade II, pain and swelling after normal activities, < 20 ° range limitation; grade III = pain and swelling even at rest, > 20 ° range limitation