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Table 4 The mean differences of VAS score for knee pain between pre-operative and post-operative assessments in four time periods for group B

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 8.31 0.46 23.21 < 0.001٭
VAS score 3 months postoperatively 45 2.48 1.51
VAS score preoperatively 45 8.31 0.46 23.93 < 0.001٭
VAS score 6 months postoperatively 45 2.00 1.65
VAS score preoperatively 45 8.31 0.46 32.86 < 0.001٭
VAS score 1 year postoperatively 45 0.88 1.30
VAS score preoperatively 45 8.31 0.46 45.89 < 0.001٭
VAS score 2 year postoperatively 45 0.51 0.92
  1. *means statistically significant