Promoted to the front page by Brent Brookhouse. This is a great look at how each event has been impacted by injury and what changes had to take place to keep the cards afloat.
-Last updated 12/28/2012 6:30PM Eastern (Mike Goldberg out at UFC 155 due to illness replaced by Jon Anik.)
Approximately 130 injuries as of 12/28/12
[Non injury card changes are in italics]
UFC 142: Aldo Vs. Mendes
Caio Magalhaes stepped in as a replacement for Nedkov however, Maldonado was injured less than a week before his fight with Magalhaes and the bout was scratched from the card.
UFC on FX 1: Guillard Vs. Miller
Mike Brown was expected to face Vagner Rocha but Brown withdrew due to injury, no replacement was found and the fight was scrapped.
Rafaello Oliveira was expected to face Reza Medadi, Oliveira was forced out of a bout with an injury and replaced by Fabrício Camões.
Madadi would later withdraw from the bout with Camoes due to injury and was replaced by Tommy Hayden.
Ryan Jimmo was expected to fight Karlos Vemola but Jimmo was forced from the bout with an injury, no replacement was found and the bout was scrapped.
Ken Stone was expected to face Mike Easton however, Stone was forced out of the bout with an injury and replaced by Jared Papazian
Charles Olivera was expected to face Robbie Peralta but the fight was scrapped for undisclosed reasons.
UFC on Fox 2: Evans Vs. Davis
Just days before the event, the bout between Bedford and Gagnon was cancelled due to an alleged visa issue for Gagnon.
Chris Weidman would step in to face Maia.
UFC 143: Condit Vs. Diaz
St-Pierre pulled out of the Condit fight due to a torn ACL, Condit and Diaz fought for the Interim title.
Erik Koch was expected to face Dustin Poirier but Koch withdrew due to injury and was replaced by Max Holloway
Amir Sadollah was expected to face Jorge Lopez but pulled out of the fight due to injury and was replaced by Matt Riddle.
Jorge Lopez then was injured and replaced by Henry Martinez.
Mike Stumpf was expected to face Justin Edwards but pulled out due to an undisclosed injury, Stumpf was replaced by Stephen Thompson.
Justin Edwards went on to pull out of the card with an injury as well and was replaced by Daniel Stittgen.
UFC on Fuel TV 1: Ellenburger Vs. Sanchez
Bernardo Magalhães was expected to face Yoislandy Izquierdo, but Izquierdo was pulled from the bout due to contractual issues with his former promotion, CFA
Roni Yahya was scheduled to face Jonathan Brookins, but withdrew due to injury and was replaced by Vagner Rocha
Sean Loeffler was slated to face Buddy Roberts but the bout was scrapped entirely due to Loeffler's pre-existing injury, no replacement was made.
UFC 144: Edgar Vs. Henderson
George Sotiropoulos was expected to face Takanori Gomi, but was forced out of the bout with an injury and replaced by Eiji Mitsuoka.
Leonard Garcia was expected to face Zhang Tiequan, but was forced out of the bout with an injury and replaced by Issei Tamura.
UFC on FX 2: Alves Vs. Kampmann
UFC on Fuel TV 2: Gustaffson Vs. Silva
Antonio Rogerio Nogueira pulled out of the Gustafsson fight due to an injury and was replaced by Thiago Silva.
Jorgen Kruth was expected to face Cyrille Diabate but was forced to withdraw due to injury, replaced by Tom DeBlass
Akira Corassani was slated to fight Jason Young but withdrew due to injury and was replaced by Eric Wisely.
UFC 145: Jones Vs. Evans
Matt Wiman was expected to face Mark Bocek, but was forced off the card with an injury and replaced by John Alessio.
UFC on Fox 3: Diaz Vs. Miller
Dennis Hallman was expected to face Tony Ferguson, but Hallman was forced out of the bout with an injury and replaced by Thiago Tavares.
Tavares was also forced from the bout with an injury and replaced by Michael Johnson.
UFC on Fuel TV 3: Korean Zombie Vs. Poirier
UFC 146: Dos Santos Vs. Mir
Junior dos Santos would defend his title against Frank Mir after Alistair Overeem tested positive for an elevated T/E ratio.
Shane del Rosario (originally slated to fight Gonzaga) faced Stipe Miočić.
TUF 15 Finale
Byron Bloodworth was slated to fight John Albert but was forced to withdraw with an injury, Bloodworth was replaced by Erik Perez.
UFC on FX 3: Johnson Vs. McCall
UFC on FX 4: Maynard Vs. Guida
Abedi was also forced out of the bout with an injury and replaced by Brock Jardine.
Rivera himself was injured and was replaced by Dustin Pague, who had just fought at UFC on FX 3 two weeks prior to this event.
UFC 147: Silva Vs. Franklin II
Anderson Silva vs. Chael Sonnen II was expected to take place in a stadium show in Rio de Janeiro, the fight was moved to UFC 148 and the venue was changed due to poor event planning (United Nations Conference).
Daniel Sarafian was expected to face Cezar "Mutante" Ferreira in the TUF Brazil Middleweight Championship bout, but pulled out with an arm injury, he will be replaced by Sergio Moraes.
UFC 148: Silva Vs. Sonnen II
Faber was expected to face replacement Renan Barão for the Interim Bantamweight Championship, but that fight has been promoted to the main event of UFC 149 in Calgary.
Rich Franklin was expected to return to middleweight with a bout against Cung Le at the event. Franklin was pulled from the bout with Le and is now scheduled to rematch Wanderlei Silva UFC 147.
Le is now expected to face Patrick Cote.
UFC on Fuel 4: Munoz Vs. Weidman
Brandon Vera was expected to face James Te-Huna however, Vera was pulled from the bout with Te-Huna and is now expected to face Maurício Rua at UFC on Fox 4.Te-Huna will now face Joey Beltran
Nick Penner was scheduled to face Tom DeBlass but Penner was forced out of the bout with an undisclosed injury. The bout was scrapped entirely from the card.
UFC 149: Faber Vs. Barao
The bout between Michael Bisping and Tim Boetsch, originally scheduled for UFC 148, was moved to this event to help bolster the UFC 149 fight card.
Bisping was forced out of the bout with Boetsch due to injury and was replaced by Hector Lombard.
Then Alves pulled out of the bout with an injury and was replaced by Chris Clements.
Siyar Bahadurzada was then injured and pulled from the fight, Chris Clements will face Matt Riddle.
Thiago Silva was expected to face Maurício Rua at the event. Silva was forced out of the bout with an injury and Rua was pulled from the event entirely, and will face Brandon Vera at UFC on Fox 4.
Bibiano Fernandes was expected to compete against Roland Delorme but was forced out of the bout after unsuccessful negotiations with the UFC.
The UFC Interim Bantamweight Championship fight between Urijah Faber and Renan Barao was re-scheduled as the main event of the fight.
George Roop was expected to face Antonio Carvalho, but Roop was forced out of the bout with an injury, he will be replaced by Daniel Pineda.
Claude Patrick was expected to face James Head but was forced from the bout with an injury, James Head will now face Brian Ebersole.
UFC on Fox 4: Shogun Vs. Vera
Mauricio Rua will now headline against Brandon Vera, both being pulled from fights on earlier cards.
Stann was expected to face Hector Lombard. However, Stann was forced out of the bout citing a shoulder injury. Lombard will now face Tim Boetsch at UFC 149.
Terry Etim was slated to fight Joe Lauzon, but Etim was forced out of the bout with an injury. He will be replaced by Jamie Varner.
Ian McCall was expected to face John Moraga, but McCall withdrew from the bout for undisclosed reasons. Moraga will face Ulysses Gomez.
Rob Broughton was expected to face Matt Mitrione but Broughton withdrew from the bout to deal with personal issues, the bout has been rescheduled for UFC on FX 5.
Ben Rothwell was expected to face Travis Browne but Rothwell withdrew due to an ankle injury. The bout was scrapped completely after Devin Cole was briefly rumored to be filling in for Rothwell.
Travis Browne will now headline against Antonio Silva at UFC on FX 5.
Swick Vs. Johnson will be promoted to the main card.
UFC 150: Henderson Vs. Edgar II
Luiz Cane was expected to face Yushin Okami, but withdrew due to injury, Cane will be replaced by Rousimar Palhares.
Rousimar was forced from the Okami bout with an injury.
Chris Camozzi was expected to face Buddy Roberts, Camozzi was forced from the bout with an injury. Buddy Roberts will now replace Palhares to face Yushin Okami.
Dennis Hallman was expected to face Thiago Tavares on this card but the bout was moved to UFC 151 in order to bolster the card. Shortly after the change, the fight was moved back to UFC 150.
UFC 151: Jones Vs. Henderson "The Event That Jon Jones and Greg Jackson Murdered" - Dana White
This event has been canceled due to Jones' refusal to fight Chael P. Sonnen on short notice and the lack of strength on the undercard.
Josh Koscheck was expected to face Jake Ellenberger in the co main event, but Koscheck was forced to withdraw with a bulging disc in his back. Jake Ellenberger will now face Jay Hieron.
Dan Henderson was expected to face Jon Jones, but Henderson was forced out with a partial tear in his MCL, Jones refused to fight Chael Sonnen and the entire card was subsequently cancelled. Jones will now face Machida at UFC 152 in Toronto.
Kyle Noke Vs. Charlie Brenneman has been moved to UFC 152
Shane Roller Vs. Jacob Volkmann has been moved to UFC on FX 5
Danny Castillo Vs. Micheal Johnson has been moved to UFC on FX 5
Dennis Hallman Vs. Thiago Tavares has been moved to UFC on FX 5
Jeff Hougland Vs. Takeya Mizugaki has been moved to UFC on Fuel 6
John Lineker Vs. Yasuhiro Urushitani has been moved to UFC on Fuel 6
Tim Means Vs. Abel Trujillo has been moved to UFC on Fox 5
Daron Cruickshank Vs. Henry Martinez has been moved to UFC on Fox 5
Denis Siver Vs. Eddie Yagin has been moved to UFC on Fox 5
UFC 152: Jones Vs. Belfort
Rory MacDonald was expected to face BJ Penn but MacDonald was forced to withdraw with a gash above his eye. The fight has been moved to UFC on Fox 5.
Roger Hollet was expected to face Matt Hamill, however Hollet was forced out of the bout due to contractual conflicts with Bellator and replaced by Vladimir Matyushenko.
Vladimir Matyushenko suffered a torn achille's tendon, and the original fight between Roger Hollet and Matt Hamill was remade.
Dan Miller was expected to face Sean Pierson but Miller withdrew to focus on his son's kidney transplant, Pierson will now face Lance Benoist.
Lyoto Machida was announced to face Jon Jones but turned down the fight as well as Mauricio Shogun Rua, Jones will now face Vitor Belfort.
UFC on Fuel 5: Struve vs. Miocic
Jorgen Kruth was expected to face Fabio Maldonado but Kruth withdrew, deciding to retire from MMA. Fabio will now face Cyrille Diabate at UFC 154.
After briefly being scheduled to face Cyrille Diabate at UFC 154, Fabio Maldonado was pulled from the fight in order to face Glover Texiera at UFC 153, a replacement to fight Diabate has not yet been determined.
Pascal Krauss was expected to face Gunnar Nelson by withdrew due to severely bruised ribs, an inflamed chest muscle and a dislocated vertebra, Gunnar Nelson will now face Rich Attonito.
Rich Attonito withdrew from the replacement fight against Gunnar Nelson over concerns with making weight, Gunnar Nelson will now face DeMargques Johnson.
UFC on FX 5: Browne Vs. Bigfoot
Louis Gaudinot was expected to face Darren Uyenoyama but Gaudinot withdrew due to injury, he will be replaced by Phil Harris.
Jake Ellenberger Vs. Jay Hieron has been moved to the co main event of this card from UFC 151.
Phil Davis was expected to rematch Wagner Prado after their first bout was stopped due to an accidental eye poke, this bout has been moved to UFC 153.
Rob Broughton was expected to face Matt Mitrione but withdrew due to undisclosed circumstances, Matt Mitrione will now face Phil de Fries at UFC 155.
Dennis Hallman was expected to face Thiago Tavares but Hallman was unable to make weight, nor a further weight that was agreed to by Tavares, the fight has been pulled from the card.
Jeremy Stevens was expected to face Yves Edwards however Stevens was arrested on the day of the event and the fight was removed from the card. Edwards will face John Cholish at UFC on Fox 5.
UFC 153: Silva Vs. Bonnar
Vitor Belfort was expected to face Alan Belcher but Belfort was pulled to face Jon Jones at UFC 152.
Alan Belcher was expected to remain on the card but withdrew due to a spinal fracture.
Eric Koch was expected to face Jose Aldo but withdrew due to a knee injury, Koch will be replaced by Frankie Edgar.
Jose Aldo was forced out of the bout with Edgar due to a foot injury, Edgar has been pulled from this card and the matchup is expected to be made at a later time.
Rampage Jackson was expected to face Glover Teixeira but Rampage pulled out due to an elbow injury, Rampage will be replaced by Fabio Maldonado.
Anderson Silva Vs. Stephan Bonnar has been booked as the main event of this card.
Geronimo dos Santos was expected to face Gabriel Gonzaga but dos Santos withdrew due to a positive test result for Hepatitis B, the fight has been removed from the card.
UFC on Fuel 6: Franklin Vs. Le
Marcello Guimaraes was expected to face Hyun Gyu Lim but Guimaraes withdrew due to an undisclosed injury, Hyun will now face David Mitchell.
Kyung Ho Kang was slated to fight Alex Caceres but withdrew due to an undisclosed injury, he will be replaced by Motonobu Tezuka.
Hyun Gyu Lim was expected to face David Mitchell but Lim was unable to get clearance by UFC doctors prior to the weigh in, believed to be related to his weight cut. The fight has been pulled entirely from the card.
UFC 154: St. Pierre Vs. Condit
Stephen Thompson was slated to fight Besam Yousef but Thompson withdrew due to a knee injury, Yousef will now face Matt Riddle.
Nick Ring was expected to face Costa Philippou but Ring became ill hours before the event and was not cleared by the UFC's doctor. The fight has been scrapped completely.
UFC on Fox 5: Henderson Vs. Diaz
Rafaello Oliveira was slated to fight Micheal Chiesa but Oliveira withdrew from the bout with a hand injury, he will be replaced by Marcus LeVassuer.
TJ Dillashaw was expected to face Mike Easton but withdrew due to an undisclosed injury, Easton will now face Bryan Caraway.
Bryan Caraway also withdrew due to injury, Mike Easton will now face Raphael Assuncao.
Eddie Yagin was expected to face Dennis Siver but Yagin withdrew due to a head injury involving swelling around his brain, no replacement has been determined yet.
John Cholish was expected to face Yves Edwards but Cholish withdrew due to a groin injury. Edwards will now face Jeremy Stevens in a bout that had been previously scrapped at UFC on FX 5 due to Stevens' arrest.
Lavar Johnson was expected to face Brendan Shaub but Johnson withdrew due to a pulled groin, this fight has been moved to UFC 157.
Michael Chiesa was expected to face Marcus LeVasseur but Chiesa withdrew due to illness the week of the fight, no replacement was made on such short notice.
Tim Means was expected to face Abel Trujillo but Means sustained a head injury by slipping in the sauna while cutting weight, he will be replaced by Marcus Levasseur.
UFC on FX 6: Pearson Vs. Sotiropolus
Kyle Noke was slated to fight Seth Baczynski but Noke withdrew due to an undisclosed injury, Noke will be replaced by Mike Pierce.
Anthony Perosh was expected to face Joey Beltran but Perosh withdrew due to a severe toe injury, he will be replaced by Igor Pokrajac.
Hacran Dias was expected to face Chad Mendes but Dias withdrew with an undisclosed injury, he will be replaced by Yaotzin Meza.
TUF Finale 16
Shane Carwin was expected to face Roy Nelson but Carwin finally succumbed the a knee injury that was sustained months ago. He will be replaced by Matt Mitrione.
Jamie Varner was expected to face Melvin Guillard but Varner fell hours before the fight and as a result was not cleared to fight. The fight has been rumored to take place at UFC 155.
UFC 155: Dos Santos Vs. Velasquez II
Chael Sonnen was expected to face Forrest Griffin but Sonnen was pulled from the fight in order to coach at TUF 17 against Jon Jones in the lead up to their title fight on April 27th. Phil Davis will now fight Forrest Griffin.
Gray Maynard was expected to face Joe Lauzon but Maynard withdrew due to an undisclosed injury, he will be replaced by Jim Miller.
Erik Koch Vs. Ricardo Lamas has been moved from this card to UFC on Fox 6.
Matt Mitrione was expected to face Phil De Fries but Mitrione was pulled from the fight in order to replace Shane Carwin, De Fries will now face Todd Duffee.
Chris Weidman was expected to face Tim Boetsch but Weidman withdrew due to a shoulder injury, he will be replaced by Costa Philippou.
Forrest Griffin was expected to face Phil Davis but Griffin withdrew due to a knee injury, Griffin has been pulled from the card as no replacement has been made.
Cody McKenzie was expected to face Leonard Garcia but Cody withdrew from the fight due to an undisclosed injury, he will be replaced by Max Holloway.
Karlos Vemola was expected to face Chris Leben but Vemola withdrew from the fight due to an undisclosed injury, he will be replaced by Derek Brunson.
Mike Goldberg was expected to commentate at UFC 155 but withdrew from the job due to illness, he will be replaced by Jon Anik.
UFC (on FX 7) in Brazil
Johnny Eduardo was expected to face Yuri Alcantara but Eduardo withdrew due to undisclosed circumstances that are not believed to be injury related, he will be replaced by George Roop.
Thiago Bodao was expected to face Caio Magalhaes but Bodao withdrew due to an undisclosed injury, he will be replaced by Michael Kuiper.
Please feel free to leave corrections and additions in the comments and I will update this post regularly.