100nl - stealing the blinds, but I hit trips, what's my play here?

[kabouter]

Villain was 18/3 over 200hands or so, nothing too strange about him.



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Played at iPoker network
5 players, seat 8 is the button

Seat 1: BB ($20.05)
Seat 3: UTG ($94.40)
Seat 5: CO ($31.40)
Seat 8: <font color="#C80000">Hero</font> ($108.75)
Seat 10: SB ($99.00)

SB posts small blind, $0.50
BB posts big blind, $1.00

Dealing to <font color="#C80000">Hero</font>:
9[img]/images/graemlins/spade.gif[/img],T[img]/images/graemlins/heart.gif[/img]

UTG calls
CO folds
<font color="#C80000">Hero</font> raises to $5
SB folds
BB folds
UTG calls

Dealing flop: (Pot is $11.50)
A[img]/images/graemlins/club.gif[/img],9[img]/images/graemlins/diamond.gif[/img],5[img]/images/graemlins/spade.gif[/img]

UTG bets $5
<font color="#C80000">Hero</font> raises to $17
UTG calls

Dealing turn: (Pot is $45.50)
9[img]/images/graemlins/heart.gif[/img]

UTG checks
<font color="#C80000">Hero</font> checks

Dealing river: (Pot is $45.50)
8[img]/images/graemlins/heart.gif[/img]

UTG bets $28
<font color="#C80000">Hero</font> calls

Showdown is hidden

I figured he must have 55, but then again he could be limp calling with AJs too with stats like that. How did I play this hand?