49ers RB Raheem Mostert suffers gruesome arm injury vs. Raiders

San Francisco 49ers running back Raheem Mostert saw a difficult end to a big night when he left Thursday’s game against the Oakland Raiders with an ugly arm injury.

Mostert had tallied 86 yards and a touchdown on seven carries as the 49ers were rolling against the Raiders when he got tripped up on a run and fell awkwardly on his right arm in the third quarter.

Ugly injury

Replay shows his arm mangled during the play. Don’t watch if you’re squeamish.

The little-used running back had tallied 175 rushing yards on the season prior to Thursday, the bulk of his 211 career rushing yards since joining the NFL in 2015.

Thursday’s was his first NFL touchdown.

He left the field wearing an air cast. Coach Kyle Shanahan confirmed after the game that he had suffered a broken arm.

Matt Breida and Alfred Morris will likely gain extra reps in Mostert’s anticipated absence.

See more from the game: 

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Oakland Raiders vs. San Francisco 49ers Thursday Night Football
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Oakland Raiders vs. San Francisco 49ers Thursday Night Football
San Francisco 49ers linebacker Elijah Lee (47) tackles Oakland Raiders wide receiver Martavis Bryant (12) during the second half of an NFL football game in Santa Clara, Calif., Thursday, Nov. 1, 2018. (AP Photo/John Hefti)
Oakland Raiders quarterback Derek Carr (4) stands on the sideline next to quarterback AJ McCarron (2) during the second half of the team's NFL football game against the San Francisco 49ers in Santa Clara, Calif., Thursday, Nov. 1, 2018. (AP Photo/Ben Margot)
San Francisco 49ers running back Raheem Mostert runs toward the end zone to score against the Oakland Raiders during the second half of an NFL football game in Santa Clara, Calif., Thursday, Nov. 1, 2018. (AP Photo/John Hefti)
Oakland Raiders nose tackle P.J. Hall (92) tackles San Francisco 49ers running back Matt Breida (22) during the first half of an NFL football game in Santa Clara, Calif., Thursday, Nov. 1, 2018. (AP Photo/John Hefti)
San Francisco 49ers running back Raheem Mostert (31) walks off the field with trainers during the second half of the team's NFL football game against the Oakland Raiders in Santa Clara, Calif., Thursday, Nov. 1, 2018. (AP Photo/John Hefti)
SAN FRANCISCO, CA - NOVEMBER 01: Oakland Raiders Head Coach Jon Gruden on the sidelines with Oakland Raiders Quarterback Derek Carr, after replacing Carr in the 4th quarter during the NFL football game between the Oakland Raiders and the San Francisco 49ers on November 1, 2018, at Levi's Stadium in Santa Clara, CA. (Photo by Cody Glenn/Icon Sportswire via Getty Images)
SAN FRANCISCO, CA - NOVEMBER 01: San Francisco 49ers Quarterback Nick Mullens (4) looks to pass during the NFL football game between the Oakland Raiders and the San Francisco 49ers on November 1, 2018, at Levi's Stadium in Santa Clara, CA. (Photo by Cody Glenn/Icon Sportswire via Getty Images)
San Francisco 49ers wide receiver Pierre Garcon runs toward the end zone to score against the Oakland Raiders during the first half of an NFL football game in Santa Clara, Calif., Thursday, Nov. 1, 2018. (AP Photo/John Hefti)
San Francisco 49ers coach Kyle Shanahan, center, celebrates with running back Raheem Mostert, partially obscured, and linebacker Dekoda Watson (97) during the second half of an NFL football game against the Oakland Raiders in Santa Clara, Calif., Thursday, Nov. 1, 2018. (AP Photo/John Hefti)
SAN FRANCISCO, CA - NOVEMBER 01: Oakland Raiders Wide Receiver Martavis Bryant (12) celebrates a first down with teammate Oakland Raiders Tight End Jared Cook (87) during the NFL football game between the Oakland Raiders and the San Francisco 49ers on November 1, 2018, at Levi's Stadium in Santa Clara, CA. (Photo by Cody Glenn/Icon Sportswire via Getty Images)
SAN FRANCISCO, CA - NOVEMBER 01: San Francisco 49ers Fullback Kyle Juszczyk (44) celebrates with fans following the NFL football game between the Oakland Raiders and the San Francisco 49ers on November 1, 2018, at Levi's Stadium in Santa Clara, CA. (Photo by Cody Glenn/Icon Sportswire via Getty Images)
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