The effect of medial open wedge high tibial osteotomy on the patellofemoral joint: comparative analysis according to the preexisting cartilage status

Table 4 Assessment of the cartilage lesion grade at second-look operation compared with the initial operation

	Group 1 (n = 59)	Group 2 (n = 33)	P value ^c
Medial compartment ^a			0.732
Stage A (No regeneration)	18 (30.5%)	8 (24.2%)
Stage B (Partial coverage)	32 (54.2%)	18 (54.5%)
Stage C (Total coverage)	9 (15.3%)	7 (21.2%)
Patellofemoral compartment ^b			0.136
Not progressed	49 (83.1%)	23 (69.7%)
Progressed	10 (16.9%)	10 (30.3%)

^a Based on macroscopic staging system of cartilage regeneration according to Koshino et al.
^b Based on International Cartilage Repair Society (ICRS) grading system
^c Statistical significance was evaluated using Pearson’s Chi-squared or Fisher’s exact test

ISSN: 1471-2474