What happened: Isiah Pacheco had surgery to relieve pressure on a nerve in his back, per @RapSheet. The update said he has a chance to return early in December after first dealing with an MCL injury and then hurting his back while training.
Why it matters: Another absence keeps pressure on a Detroit backfield that has already been forced to adjust early in the season. It also extends the run of setbacks around Pacheco's recent injured-reserve move and leaves the Lions waiting on stability at the position.
What to watch: The next update to watch is whether Detroit gives a firmer recovery timeline as December approaches. Any roster move tied to Pacheco would clarify how soon the backfield picture might change.