Collett has been plagued by knee problems for the l' />

By MIKE DILLON

One of New Zealand's most successful jockeys, Jim Collett, is retiring.

Collett has been plagued by knee problems for the last decade.

He has had several knee operations and resumed riding after a long break with four rides at Rotorua on January 22.

He then had four rides at Ellerslie two weeks ago after which it is understood his injuries recurred.

The 42-year-old is part of the highly successful Collett family from Southland.

He began his riding career in Southland, mixing flat rides with competing in jumps races.

From 80 jumps rides he rode 10 winners.

Collett rode extensively in Asia and recorded 1620 winners.

The last of them was Wild Oscar at Avondale on Anzac Day last year.