The South Australian suffered the injury on Saturday night when he crashed during the madison at the Australian championships in Melbourne.
The impact snapped Porter's helmet in half, but the worst damage was to his left shoulder.
While the team pursuit rider should recover in time for the February worlds in Poland, the injury will put a significant dent in his training.
While incredibly painful, the injury is so common in cycling it is regarded as an occupational hazard.
Porter was part of the combination that broke the world record in April at the Commonwealth Games.
Porter, Sam Welsford, Kelland O'Brien and Leigh Howard rode three minutes 49.804 seconds, going under 3:50 for the first time. The February worlds will be the next chapter in the fierce team pursuit rivalry between Australia and Great Britain, the reigning Olympic and world champions. Australia also took the world record away from the British, who set the previous mark at the Rio Olympics.
Meanwhile in London at the Track World Cup, Australian Stephanie Morton triumphed in the women's keirin (11.423 at 63.031km/h) and the women's sprint, easily dispatching German Emma Hinze in two heats of the final.
Amy Cure and Annette Edmonson took on the women's madison in style, finishing second to GB track super stars Laura Kenny and Kate Archibald.
Dutchman Harrie Lavreysen was too good for Aussie Matthew Glaetzer in the sprint final, the South Australian missed out on the 1-6 final in the keirin but won the 7-12 consolation race, while Amy Cure finished a gallant 8th overall in the omnium.
Laura Kenny and Katie Archibald (C) Amy Cure and Annette Edmondson (L) and Lotte Kopecky and Jolien D'Hoore (R) Source: Getty Images Europe
Australian Track Cycling Championships - #tracknats
Victoria rode a speedy 3:56 to easily beat South Australia in the men's team pursuit final at the Australian track cycling championships.
A powerful Victorian quartet showcasing the depth of Australian men's team pursuiting have comfortably defended their national title.
World record holders Leigh Howard and Kelland O'Brien combined with young gun Luke Plapp and starter Godfrey Slattery to dominate the final against SA on Saturday night.
After qualifying second-fastest on Thursday behind SA, Victoria rode three minutes 56.588 seconds to easily beat the South Australians' 4:01.422 at Melbourne Arena.
With the fierce Australia-Great Britain rivalry in the men's team pursuit always simmering, national coach Tim Decker noted Victoria's time was quicker than the 3:59 from the British at the latest World Cup round in London.
"To win the national title and run 3:56 for a state team, I'm over the moon," Howard said.
On Thursday, Plapp won the emerging athlete category at the Australian Sports Commission Awards, one of three honours for Australian cycling.
"Kelland and I have done some pretty good things in the last 12 months but you talk about Luke, he's an amazing talent," Howard said.
"And Godfrey - the job of a starter, it's a lot more difficult than people give it credit. We have a pretty special state team."
Alex Porter (SA) and Sam Welsford (WA), who combined with Howard and O'Brien to set the world record of 3:49.804 at the April Commonwealth Games, also rode at the nationals.
The next big goal for the team pursuiters will be the February world titles in Poland, where they will go head-to-head again with the British.
Queensland were caught by SA in the women's team pursuit final, while the NSW Institute of Sport won the bronze medal.
Sprint ace Kaarle McCulloch, who bypassed the London World Cup round and is in a heavy training block instead, led NSW to their first women's team sprint championship in seven years.
McCulloch combined with Sophie Knox to qualify fastest on Thursday and then teamed with Selina Ho on Saturday night to beat Victoria in the final.
Two teenagers won the prestigious Austral wheelrace handicap finals, also held on Saturday night.
Australian junior keirin champion Sam Gallagher, 17, took out the men's race off a 90m mark.
Stephanie Corset, the daughter of 2010 Australian road race champion Ruth Corset, won the women's Austral.
The 16-year-old rode off a 165m handicap.
Kristina Clonan and Maeve Plouffe combined to win the women's Australian madison championship with 47 points, while Macey Stewart and Josie Talbot were three behind in second.
The Australian championships are split this summer, with several events to be held in Brisbane in February.
