Not unless it has gone bad. One should have no effect on the other. You may want to carefully check the boot/seal. If one went out, the other one may be close behind. If the boot is cracked or split, I suspect it won't be long before the ball joint is also bad. But, I can see no reason for replacing it unless you can detect a problem with it.
95 Contour Zetec, ATX (wrecked, sitting in the barn)
95 Mystique Zetec, MTX
2000 Taurus SEL 3.0L Duratec
1994 Crown Victoria LX 4.6 V8
1993 Chevy Silverado 4.3 V6
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