Table 1.

The findings reported at each of the three followup periods

Patient details	Minimum 6-year followup study	Minimum 10-year followup study	Minimum 15-year followup study
Total number followed	51 knees (40 patients)	49 knees (38 patients)	19 knees (16 patients)
Mean duration of followup (years)	7.5 (range, 6–10)	12 (range, 10–13)	19 (range, 15–21)
Died before minimum followup	10 knees (10 patients)	13 knees (13 patients)	42 knees (34 patients)
Lost to followup	1 knee (1 patient)	0 knees	1 knee (1 patient)