The rookie righthander was injured in the second inning Friday night on a liner by Washington's Ian Desmond.
Dugger said the injuries Nicasio suffered are more often associated with an auto accident or perhaps diving into shallow water and hitting a rock.
"We just don't see it that much in football or even in baseball," Dugger said.
Dugger said he remained hopeful that Nicasio could be back on the mound by next spring, noting there was no bruising, bleeding, or other damage to the spinal cord.
Avoiding a record
Brewers infielder Craig Counsell entered the game in Houston Friday night as a pinch-hitter in the eighth and shot a single into right field. That snapped the 41-year-old's streak of hitless at-bats at 45, one short of the record for futility by a position player, set by Bill Bergen of the Brooklyn Superbas in 1909.
Happ sent down
The Houston Astros optioned lefthander J.A. Happ to triple-A Oklahoma City.
Happ, sent to Houston in the trade that brought Roy Oswalt to Philadelphia last July, was 4-14 with a 6.26 ERA in 22 starts. He has allowed five or more runs in eight straight starts. Happ was 5-4 with a 3.75 ERA in 13 starts last season for Houston.
"I'm disappointed," Happ said. "You never expect to be sent down. Hopefully I can go down and clear my head a little bit and get this thing figured out sooner than later. It's way too late to start feeling sorry for yourself."
Pittsburgh recalled righthander Brad Lincoln from triple-A Indianapolis. . . . San Diego placed outfielder Chris Denorfia on the disabled list with a strained right hamstring. . . . Atlanta put righthander Jair Jurrjens on the 15-day DL with a strained right knee.
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This article contains information from the Associated Press.