OCTOBER 6: Armstead will indeed be shut down for an extended stretch. The Dolphins have placed him on injured reserve, per Tom Pelissero and Ian Rapoport of NFL Network. The move will guarantee at least a four-week absence, though Pelissero notes this new knee injury will likely not be season-ending. Lamm will be in place as the team’s blindside blocker for the foreseeable future as the Dolphins aim to continue their strong start to the season.
OCTOBER 3: Terron Armstead is facing another injury-induced absence. The Dolphins left tackle suffered a knee injury which will cause him to miss “weeks, not days,” as head coach Mike McDaniel indicated. 
McDaniel confirmed, via Barry Jackson of the Miami Herald, that Armstead will miss Miami’s Week 5 contest against the Giants. The latter exited Sunday’s loss against the Bills in the second quarter, and he was later seen leaving the stadium on crutches. Notably, McDaniel said after the game this latest ailment “wasn’t a re-aggravation” of an existing one but rather a new injury altogether (h/t Pro Football Network’s Adam Beasley).
Armstead has a long track record of missed time or games where he has played at less than 100% in both New Orleans and Miami. He was limited to 13 games in 2022, his debut Dolphins campaign, and his first appearance this year was delayed due to his rehab from offseason surgery. The 32-year-old had been confident he would be able to suit up for the regular season opener, but between his two most recent ailments he has logged only 78 snaps through four weeks.
Signed to a five-year, $75MM deal last offseason, Armstead came to South Beach with considerable expectations. His first Dolphins campaign earned him a fourth career Pro Bowl nod, and his pass blocking in particular remained a strength with only one sack allowed. His consistent level of play appears to have continued into 2023 with a PFF grade of 78.4, which ranks 10th amongst qualifying tackles.
McDaniel added that Kendall Lamm, who took over for Armstead after his exit, will retain the starting job on the blindside in Week 5. Lamm has already seen significantly more snaps this season (190) than he did in 2022 (32), his first year in Miami. The former UDFA has 55 appearances and 24 starts to his name. His time as a first-teamer at the LT spot is not expected to last through the remainder of the campaign, however.
“We have to kind of see how everything settles down, and then we’ll be able to make a better prognosis for that timeline here in a couple days, by the end of the week or so,” McDaniel said of Armstead. “I can say that he won’t be playing in the next game, but he will be playing again this season.”