Table 1. Patient Characteristics.

Primary THR	Kellgren Grade 0–2	Kellgren Grade 3+4	All Patients
Age at Joint Replacement	65.1 (7.8)	67.4 (8.7)	66.6 (8.5)
Males	23.9%	44.3%	37.5%
Follow-up (years)	2.83 (1.0)	2.79 (0.9)	2.8 (0.93)
Charnley:
Class A:	25.8%	24.0%	24.6%
Class B:	14.6%	13.7%	14.0%
Class C:	59.6%	62.3%	61.4%
Body Mass Index:
<25:	29.2%	34.1%	32.5%
25–30:	41.6%	46.4%	44.8%
30–35:	23.6%	16.2%	18.7%
>35:	5.60%	3.40%	4.10%
Primary TKR	Kellgren Grade 0–2	Kellgren Grade 3+4	All Patients
Age at JointReplacement	65.1 (10.3)	69.5 (8.6)	69.1 (8.9)
Males	31.8%	30.9%	31.0%
Follow-up (years)	3.1 (1.1)	2.79 (0.9)	2.82 (0.93)
Charnley:
Class A:	4.50%	19.0%	17.5%
Class B:	4.50%	11.4%	10.7%
Class C:	90.9%	69.6%	71.8%
Body MassIndex:
<25:	33.3%	14.7%	16.3%
25–30:	27.8%	46.7%	45.0%
30–35:	33.3%	21.2%	22.3%
>35:	5.60%	17.4%	16.3%

All values are mean (SD), unless stated otherwise.