Yes, you can knit with one hand!

Recreation Therapists are presently successfully using this kit in hospitals.

The patented Knit-One clamps to a table or a solid, exposed chair arm. Just slide one needle into the clamp and knit with the other needle. The Knit-One will hold the yarn on the clamped needle and can readily be moved along for knitting ease. The kit comes with 1 clamp and 3 pairs of handmade steel needles (sizes 4, 5 and 6mm). Due to hand milling, needle sizes may not be exact.

We also offer authentic, handcrafted Steel knitting needles.
My grandmother learned how to knit with steel knitting needles and they have not been available for a long time.
For knitting aficionados handmade Steel knitting needles are available for sale in sizes of 4, 5 and 6mm. This translates to sizes 6, 8 and 10 in US measurement. Due to hand milling, needle sizes may not be exact.