What to do if a knitted fabric has unraveled and the thread is lost?

If a knitted fabric comes undone, the main thing is not to panic and act carefully. First, you need to stop the unraveling process so you don't lose even more rows. Gently secure the edge stitches with a small safety pin or needle so they don't unravel further. Then carefully look at exactly where the tear happened and try to trace the direction of the knitting - usually the thread goes in a zigzag through all the stitches.

If you find the end of the thread or at least can see where it goes, you can try to restore the fabric by hand. Use a crochet hook of the appropriate size - it's convenient for picking up the unraveled stitches from bottom to top and moving them onto needles or a crochet hook. If the thread is actually lost, you'll have to use a new one that's as similar as possible in thickness and color. You thread it into a blunt needle and carefully pull it through all the stitches.

Honestly, if the hole is small and in an inconspicuous place, sometimes it's easier to just darn it. Pick a thread that matches the color and carefully stitch the tear with horizontal stitches under the unraveled rows - from a distance it'll be barely noticeable. For the future, here's a tip: if the thing is expensive, save your leftover yarn after knitting, it always comes in handy for repairs.

So here's the thing - if the thread is actually lost, not just come undone, then yeah, you'll have to re-knit it, agreed. But first you should check whether the remaining thread can even be pulled back or if it's already broken in several places. If you can manage to unravel it back to an intact thread, then fixing the fabric will be easier. If the thread is torn or completely lost though, then yeah, you'll either have to re-knit that section with matching yarn or just sew up the hole with a nice seam - depends on how it looks on the finished piece.

A crochet hook saves the day in situations like this - if the thread is really lost, you can use it to catch the dropped stitches and carefully tighten them back up. The main thing that most people don't pay attention to is that you need to work very slowly and check the tension, because if you pull wrong, you can skew the entire row and ruin the look. And if the thread is completely lost, then yeah, you'll have to knit it again - you found a good solution, but it's important to pick thread that matches as closely as possible in thickness and composition, otherwise the patch will be noticeable.