Table 3.

Properties of OCD lesions and epidemiological data

	ICRS Score	Defect Size	OCD grading
Previous operation*
Corr.-coefficient	0.3804	0.3042	0.3789
Valid cases	28	20	28
Significance (P)	0.0229	n.s.	0.0234
Duration of complains
Corr.-coefficient	0.0773	-0.0992	0.2444
Valid cases	28	20	28
Significance (P)	n.s.	n.s.	n.s.
Age
Corr.-coefficient	0.3039	0.1256	0.4018
Valid cases	28	20	28
Significance (P)	n.s.	n.s.	0.0170
BMI
Corr.-coefficient	0.1547	-0.2090	0.2778
Valid cases	28	20	28
Significance (P)	n.s.	n.s.	n.s.
FFI
Corr.-coefficient	0.4669	0.2016	0.5232
Valid cases	28	20	28
Significance (P)	0.0061	n.s.	0.0021
CFSS
Corr.-coefficient	-0.3626	-0.1845	-0.4936
Valid cases	28	20	28
Significance (P)	0.0289	n.s.	0.0038
AOFAS
Corr.-coefficient	-0.2734	0.0065	-0.4588
Valid cases	28	20	28
Significance (P)	n.s.	n.s.	0.0070
KLS
Corr.-coefficient	0.3954	-0.0256	0.5119
Valid cases	28	20	28
Significance (P)	0.0186	n.s.	0.0027
AOSS
Corr.-coefficient	0.4035	0.4125	0.3846
Valid cases	25	17	25
Significance (P)	0.0227	0.0499	0.0288

Correlation of items characterizing an OCD lesion with regard to the accompanying cartilage lesion in the ankle with epidemiological data, function and radiological parameters. ICRS Score characterizes degree of cartilage damage. Defect size was only reported for type 3 or 4 lesions (full thickness defects). OCD grading is reported according to Berndt and Harty; BMI: body mass index, FFI: foot function index, CFSS: calcaneal fractures scoring system according to Kerr, AOFAS: ankle-hindfoot scale, KLS: Kellgren Lawrence Score, AOSS: ankle osteoarthritis scoring system, corr.-coefficient: correlation coefficient Spearman’s ρ, *U-test.