Table 4.

Descriptive statistics of the Olerud and Molander Score with distribution regarding the type of single and combined joint surface irregularities. The values correspond to the scores achieved

Type of joint surface irregularities	N	Mean	Standard deviation	Min.	Max.
Step	4	97.50	2.89	95.00	100.00
Gap	9	68.89	24.47	40.00	100.00
Defect	2	60.00	21.21	45.00	75.00
Step + gap	9	72.22	17.34	45.00	95.00
Step + defect	4	51.25	18.87	25.00	65.00
Gap + defect	4	41.25	24.28	10.00	65.00
None	2	100.00	0.00	100.00	100.00
Total	34	69.12	24.79	10.00	100.00