Directed by Gianni Martucci (who also directed Milano…difedersi o morire and wrote the scripts for Gianfranco Piccoli's Il Fiore dai petali d'acciaio and Alfonso Brescia's Ragazza tutta nuda assassinata nel parco) Trhauma doesn't reach the same sleazy heights as Giallo Venezia and Play Motel, two of the other infamous gialli made in 1979.
This is more of a slasher where a group of friends heads out to a country villa and get pick off one by one. There's is little doubt as to identity of the killer and the twist is bascially revealed by the prologue. It's a low budget affair with a poor actors and mediocre direction. There really is very little to recommend about the film, but it's mercifully short at 78 minutes.