Table I.

Patient demographics.

Variable	M:F ratio	Age in years, median (range)	BMI, median (range)	Time in months from primary to revision TKA, median (range)	Primary indication for surgery
Primary TKA (n = 11)	6:5	63 (54 to 79)	29 (24 to 38)	N/A	Osteoarthritis (n = 11)
Revision fibrotic group (n = 8)	4:4	65 (47 to 72)	30 (23 to 35)	17.5 (10 to 47)	Joint fibrosis after knee arthroplasty
Revision non-fibrotic group (n = 5)	2:3	80 (58 to 80)	29 (23 to 40)	170 (33 to 204)	Instability (n = 1) Osteolysis with loose worn components (n = 3 Valgus deformity post-fracture (n = 1)

BMI, body mass index; N/A, not applicable; TKA, total knee arthroplasty.