Konopka originally won the bronze medal at the 2002 European Indoor Championships with a personal best throw (indoor) of 20.87 metres, but tested positive for stanozolol and lost the medal. He was suspended between March 2002 and March 2004.
His personal best throw outdoor is 20.66 metres, achieved in May 2001 in Ostrava. He currently holds the Slovak indoor record with 21.57, achieved when he won the 2007 European Indoor Championships.
On 13 May 2008 he was tested positive for metandienone and subsequently received a lifetime ban from competing.