All-rounder Abdul Razzaq and wicketkeeper Moin Khan also deposed before the commission, probing into the spate of injuries Pakistan suffered in the recent series defeat against India.
PCB spokesman Sami-ul-Hassan said in Islamabad that Shoaib along with Razzaq and Moin appeared before the four-member medical commission and underwent the required medical tests that would determine the nature of injuries that prevented them from playing against India.
Hassan said the committee of medical specialists examined the three and fixed a rehabilitation regime. "It is a long procedure which could take hours."
Besides the three players who deposed on Wednesday, the PCB had also directed fast bowlers Umar Gul and Shabbir Ahmed to undergo the tests and prove the authenticity of their injuries.
While Gul appeared before the panel on Sunday, Shabbir forwarded his medical reports to the commission before leaving to play County cricket in England.
The commission was established following criticism from top PCB officials that they believed players, especially Shoaib faked injury after a fall during the second day of deciding third Test at Rawalpindi.
Shoaib, who took 3 for 47 in 21 overs, then declined to bowl on the crucial third day but came out to bat on the fourth day in the second innings before Pakistan suffered an innings defeat and lost the series 1-2. This made the team management publicly express its surprise over Shoaib's injury.
Meanwhile, Shoaib, who returned from Mumbai on Monday after taking part in a commercial shoot along with Sachin Tendulkar, has strongly denied that he had faked his injury because of reported differences with captain Inzamam-ul-Haq.
"My wrist was also injured but the bigger problem was a torn ligament in the lower back," he was quoted as saying by local daily The News.
He said it was "crap" to say that he deliberately didn't bowl on the third day. "People are just trying to pass on the blame. I will give my side to the PCB chairman and to their panel."
After his arrival, Shoaib met his trainer, Dr Tauseef Razzaq, who quit his job as physio of the team after the second Test at Lahore following differences with Inzamam. He went for another check up with Dr Razzaq as he prepared to appear before PCBs panel that includes orthopaedic surgeons.
Dr Razzaq told the media after examining the speedster that Shoaib was being made a scapegoat for the failure of the team