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

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

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	23.21	< 0.001٭
	VAS score preoperatively	45	8.31	0.46	23.93	< 0.001٭
	VAS score 6 months postoperatively	45	2.00	1.65	23.93	< 0.001٭
	VAS score preoperatively	45	8.31	0.46	32.86	< 0.001٭
	VAS score 1 year postoperatively	45	0.88	1.30	32.86	< 0.001٭
	VAS score preoperatively	45	8.31	0.46	45.89	< 0.001٭
	VAS score 2 year postoperatively	45	0.51	0.92	45.89	< 0.001٭

ISSN: 1471-2474