Can't use Stored Procedure parameter in WHERE clause - mysql

Question

I'm having a lot of troubles with one situation on my DB.
I'm trying to code a Stored Procedure that inserts an entry to a log table for audit purposes after a SELECT is done in a specific table (the idea is that it should work similar to how a AFTER SELECT Trigger would work). The Stored Procedure has one input parameter, the WHERE condition/clause.
The user executes the SP and writes the condition (for example IDCultura=1). The SP uses that parameter to make a SELECT statement like this: SELECT * FROM dba.medicoes WHERE *IDCultura=1*
My problem arrives when I try to make a cursor that loops the results from that query, so it inserts one line in the log table for each result of the SELECT.
I can't use the parameter as WHERE clause, but if I manually write the same text in the clause, it works.
I've seen some solutions that use a CONCAT to join all the parts of the query before execution. But because I'm using the SELECT query when declaring the cursor, I can't SET a variable before.
Here's the code I'm working with right now:
CREATE DEFINER=`root`#`localhost` PROCEDURE `select_medicoes`(
whereCondicao varchar(200))
BEGIN
DECLARE ID_novo int;
DECLARE ID_Variavel int;
DECLARE ID_Cultura int;
DECLARE NumMed int;
DECLARE DataHoraMed date;
DECLARE ValorMed int;
DECLARE done INT DEFAULT FALSE;
DECLARE curs_medicoeslog cursor for
(SELECT *
FROM `dba`.medicoes
WHERE `whereCondicao`);
DECLARE CONTINUE HANDLER FOR NOT FOUND SET done = TRUE;
SELECT `whereCondicao`;
OPEN curs_medicoeslog;
read_loop: LOOP
FETCH curs_medicoeslog INTO ID_Variavel, ID_Cultura, NumMed, DataHoraMed, ValorMed;
INSERT INTO log_medicoes (IDVariavel, IDCultura, NumMedicao, DataHoraMedicao, ValorMedicao, Utilizador, `Data`, Operacao)
VALUES (ID_Variavel, ID_Cultura, NumMed, DataHoraMed, ValorMed, current_user(), now(), 'S');
IF done THEN
LEAVE read_loop;
END IF;
END LOOP;
CLOSE curs_medicoeslog;
END