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Table 3 The mean differences of VAS score for knee joint between pre-operative and post-operative assessments in four time periods for group A

From: Use of hyaluronic acid injection after arthroscopic release in lateral patellar compression syndrome with degenerative cartilage changes: randomized control trial

Study variables Periods of assessment N Mean SD Paired t-test P-value
VAS score VAS score preoperatively 45 8.44 0.50 25.02 < 0.001٭
VAS score 3 months postoperatively 45 2.06 1.49
VAS score preoperatively 45 8.44 0.50 29.83 < 0.001٭
VAS score 6 months postoperatively 45 1.31 1.39
VAS score preoperatively 45 8.44 0.50 43.09 < 0.001٭
VAS score 1 year postoperatively 45 0.80 0.99
VAS score preoperatively 45 8.44 0.50 50.99 < 0.001٭
VAS score 2 year postoperatively 45 0.53 0.89
  1. *means statistically significant