TABLE I.

Study Groups at Ten-Year Follow-up

	Original Study Group (N = 75)	Study Group at Ten Years (N = 40)	Number of Men/Women	Years of Age (Range)*
Hybrid†	20	10	5/5	60 (37 to 74)
CoCr†	15	9	4/5	58 (40 to 80)
Ti†	20	8	5/3	59 (41 to 79)
Control†	20	13	5/8	62 (45 to 70)

^*Age values and range are expressed in mean number of years.

^†Hybrid total hip arthroplasty consisted of a modular cobalt-alloy femoral stem and head inserted with cement and a titanium acetabular socket inserted without cement; cobalt-chromium (CoCr) total hip arthroplasty consisted of an extensively porous-coated modular cobalt-alloy femoral stem with a cobalt-alloy femoral head and a titanium-alloy socket, inserted without cement; titanium (Ti) total hip arthroplasty had a proximally porous-coated modular titanium-alloy femoral stem with a cobalt-alloy femoral head and a titanium socket, inserted without cement; and control subjects had no implants.