Table 2.

A symptom scale (SYS) value was determined by summing the point values of the listed items. The minimum score on the SYS for an asymptomatic knee is 5, and the maximum value is 20, representing the worst subjective report

	Symptoms	Scores
1. Patient’s statement of pain	no pain	1
	mild pain	2
	mild pain at certain movements (e.g. ascending stairs)	3
	mild pain at walking	4
	moderate but permanent	5
	strong	6
2. Subjective feeling of instability	stable	1
	occasional instability	2
	permanent instability	3
3. Walking distance	unlimited	1
	up to 1 h	2
	up to 15 min	3
	a few steps	4
	no walking possible	5
4. Ability to ascend/descend stairs	good	1
	painful	2
	impossible	3
5. Ability to squat	good	1
	painful	2
	impossible	3