A320
Flight Crew Air Transport Pilot (ATP)
Flight Crew Last 90 Days 227; Flight Crew Type 3018
Deviation / Discrepancy - Procedural Clearance; Inflight Event / Encounter Wake Vortex Encounter
General Physical Injury / Incapacitation
Environment - Non Weather Related; Procedure
Initial climb out of DEN. Seat belt sign on; flight attendants up. Climbing through approximately FL280 suspect we encountered wake turbulence from aircraft 10-15 nm ahead and 4;400 feet. above us (757). Auto flight was engaged. Abrupt 25 degree roll left and increasing. Disconnected autopilot and stabilized the aircraft. Offset 2 nm right of track and reported encounter to ATC. Checked with Purser; who reported that everyone was ok. Found out an hour later just prior to top of descent that one flight attendant had fallen during the turbulence encounter and had some side and back pain.
A320 Captain reported that a wake turbulence encounter resulted in an injury to a flight attendant.