Table 1 . Descriptive statistics of the studied variables .

Variable	Mean	SD	Min	Max
Age (years)	28.2	12.37	13	67
Duration of symptom per month	30.3	25.19	6	96
Pre-operation KSS	63.1	6.68	47	73
Post operation KSS	77.8	9.29	54	91
Follow up duration per year	4.6	3.24	2	17