Northern Ireland rider Keith Farmer says his surgery has “gone well” after he suffered bilateral fractures to both lower legs.
The Clogher man sustained the injuries in a crash during Saturday’s practice for the British Superbike round at Knockhill.
Farmer came off his Tyco BMW at Turn 3 and became tangled with his machine.
“Five-hour operation went well this morning,” he said in a social media post on Sunday evening.
“I’ve broke the ‘tib and fib’ and now got some metal work up the inside of them.”
Farmer was diagnosed and treated at the circuit medical centre on Saturday before being transferred to Edinburgh Royal Infirmary for further assessment.
The Clogher rider was second fastest in Saturday’s qualifying session which was delayed because of heavy rain.
He lies 14th in this year’s series standings with 54 points after the races were completed on Sunday.
Farmer won the National Superstock 1000cc title last season to clinch his fourth British Championship crown.
Saturday’s scheduled Supersport sprint race did not take place and was rearranged for Sunday morning.
Andy Reid was sixth in the Superstock 1000cc race, with Scott Swann third in the opening British Motostar event.
Carl Phillips and Graeme Irwin failed to finish the Superstock 1000 outing.
Defending Supersport champion Jack Kennedy secured pole position for the middleweight class, with series leader Alastair Seeley back in sixth place on the grid.
EHA Racing Yamaha rider Seeley enjoys a 30-point advantage over the Dubliner after four rounds and eight races of the championship.
Carrickfergus rider Andrew Irwin was fifth fastest in the Superbike qualifying for Honda Racing, while his brother Glenn was 20th.