Almost every sidewalk cracks eventually. The question is whether the crack is cosmetic or a sign the panel has failed. Hairline cracks that stay flat and don't widen are usually just the concrete moving with the seasons, and they can often be left alone or sealed.
Replacement makes sense when a panel has heaved or sunk and created a lip someone could trip on, when cracks have widened and pieces are breaking loose, or when the surface is badly scaled from salt and freeze-thaw damage. Those are signs the base underneath has moved, and patching the top won't fix that.
Tree roots are a common culprit on older streets around Lafayette. When roots lift a panel, we remove it, deal with the base, and pour a new section that sits flush with its neighbors. On sidewalks the city or a landlord is responsible for, it's worth checking who handles repairs before scheduling work.
If you're not sure which category your sidewalk falls into, we're happy to look at it. A site visit and written estimate are free, and we'll tell you honestly if a section can wait.