Table 1.

Patient Demographics

	Primary (n = 29)	All Revisions (n = 33)	p Value	Osteolysis, Loose Components	Primary Laxity Pattern (n = 8)	Progression of OA(PFJ Replacement, n = 3)	Clinical Diagnosisof Fibrosis (n = 11)
Age (years, mean, SEM)	66 ± 2	68 ± 2	0.76	70 ± 3.2	67 ± 5	69 ± 6	65 ± 4
Gender	17 M:12 F	16 M:17 F	0.88	5 M:6 F	4 M:4 F	3 F	7 M:4 F
BMI (Mean, SEM)	33 ± 1	33 ± 1	0.97	34 ± 2	33 ± 2	30 ± 2	34 ± 2
Time from primary to revision surgery (years, mean, SEM)	–	10 ± 1	–	16 ± 3	6 ± 1	6 ± 3	8 ± 2
WOMAC pain scores (Mean, SEM)	30 ± 3	52 ± 7	0.001	65 ± 5	49 ± 4	34 ± 7	38 ± 4

No difference was found comparing age, gender, or body mass index (BMI) in revision versus primary patients, or comparing groups according to indication for revision (p = > 0.05, U test). Pain was significantly higher in revision versus primary patients (p = < 0.001).

SEM, standard error of mean.