The pointed, 60mm fence pole entered his right leg behind the thigh and exited below the knee.

The Fairy Meadow man, who is studying engineering, was left hanging on the fence of the Avis Rent-A-Car yard until police saw him just after midnight.

Police officers supported the man's weight until a NSW Fire Brigades rescue team arrived and cut out a three-pronged section of the fence to free him.

He was transported to Wollongong Hospital with part of the pole still embedded in his leg and was conscious throughout.

The post is believed to have passed through the leg without causing any major damage or arterial bleeds.

He was airlifted to St George Hospital where the post was removed and he was treated with antibiotics before being discharged.

The accident was the second impaling in a week.

Last week a Nowra man was impaled by a garden stake in a motorcycle accident - and is believed to have been robbed and assaulted while suffering his life-threatening injuries.

The 39-year-old allegedly stole a bike and was riding it along Adelaide St, Greenwell Point, when he lost control.

A timber metre-long garden stake was driven through his right armpit and out his back. Paramedics arrived to find the man conscious and the stake already pulled from his body.

Nowra police confirmed there was no motorcycle at the scene when authorities arrived.

A source said the owner of the bike had caught up with the rider, pulled out the stake and punched him on the nose before taking his wallet and reclaiming the motorcycle.