Erm... no.
Spasticity is connected with the motor system / central nervous system.
It's where some muscles spasm causing muscle tightness.
Fuck all to do with osteoarthritis, but don't let your lack of knowledge hamper your use of the internet, there Dekion.
( mns 2️⃣2️⃣9️⃣0️⃣7️⃣, Thu 21 May 2009, 20:41, archived)

Thanks, dad.

( (|D[ekionplexis B3ta.com: fictional child porn is OK, Thu 21 May 2009, 20:44, archived)

Who are you, Stephen Hawking?
Spastic.
( stopmeandslapme Cometh the hour, cometh your mum, Thu 21 May 2009, 20:44, archived)

Careful now.
That is sounding very much like the makings of a wobble.
( mns 2️⃣2️⃣9️⃣0️⃣7️⃣, Thu 21 May 2009, 20:46, archived)