Bahraini authorities have denied the claims, which have been made by the inmates’ relatives.
Interior Ministry assistant under-secretary for Legal Affairs, Colonel Mohammad Buhamood, said last week that prisoners claiming to have been tortured were examined by a forensic doctor.
He added that medical tests had showed no detainee had been tortured and described the allegations as "groundless".
However, Human Rights Watch is calling for an independent probe into the claims.
"Bahrain should launch an immediate, thorough and impartial investigation into allegations of grave abuses in detention centres," said deputy Middle East and North Africa director Joe Stork.
The men were arrested during violent clashes with police, which were sparked by the death of a protester during a demonstration on December 17.
However, security authorities and medical personnel are adamant that Ali Jassim Maki died of natural causes.
Public Prosecution spokesman Abdulrahman Al Sayed said on January 3 that 22 riot suspects were in custody and those who had been temporary released could be summoned again for further questioning.
One man has been charged with attempted murder for allegedly running over two policemen, who were seriously injured.
Two other officers escaped unhurt when the defendant allegedly tried, but failed to run them over as well.
He has denied the allegation and blamed two of his passengers. Two others are accused of throwing Molotov cocktails at Hamad Town Police Station, causing minor damage.