Table 3.

Onset time and direction of bearing dislocation

	Total cases	Dislocation time from primary UKA (year)			Dislocation direction
		< 2	2 to 5	> 5	Anterior	Posterior	Medial	Lateral
Bae et al. [5]	67	37	16	14	36	28	3	0
Choy et al. [11]	15	6	3	6	9	6	0	0
Kang et al. [6]	22	8	10	4	10	11	0	1
Tian SQ et al. [7]	4	3	1	0	NA
Xue et al. [8]	3	2	1	0	1	2	0
Yoshida et al. [9]	10	7	3	0	5	2	0	2