Reports said he had suffered severe headaches after the injuries caused an old neck injury to flare up.
Tyson Chandler, who missed his 10th consecutive game with a neck injury, did some light jogging before the game.
O'Gara, 32, came on as a replacement for James Hook, who suffered a neck injury in the first half.
The Irishman incurred a serious neck injury after falling at Warwick in March.
Whiplash is characterised by the NHS as a neck injury caused by a sudden movement of the head forwards, backwards or sideways.
Condit was initially due to face Rory MacDonald but the Montreal fighter had to pull out with a neck injury.
Those plans were abandoned following medical checks on a neck injury the German suffered in a motorcycle accident earlier this year.
"Unfortunately I had quite a serious neck injury going into the games which I had for about 12 months before, " she said.
However, an aggravated neck injury quashed Schumacher's hopes and now Massa, recuperated after fracturing his skull, is ready to return to racing.
Specialist tight-head Harrison, 28, will ease the burden on new Wales cap Rhys Thomas, Chris Anthony having retired with a neck injury.
Billericay Town goalkeeper Nicky Morgan, 25, was taken to the Queen's Hospital in Romford with a neck injury following the attack last Friday.
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Last-man Amjad Khan's 29 was the third-highest score for Kent, who were deprived of the services of Geraint Jones because of a neck injury.
The Dragons had endured a difficult week after their former Northampton centre Marc Stcherbina suffered a serious neck injury during the previous weekend's Saturday's defeat.
The 24-year-old Stormers player was named world player of the year in 2004 and missed half of the 2006 season after suffering a serious neck injury.
Russia are already without 2002 hero Mikhail Youzhny, who is missing after failing to regain top form since missing the US Open with a neck injury.
Matai needed lengthy treatment on what appeared to be a neck injury but on the resumption, Paul Wellens went close to adding another try before being bundled into touch.
One of the firemen was still in hospital being treated for a neck injury on Thursday night after the stone-throwing incident in the west of the city.
The return of Thompson, 31, is even more pertinent after he was initially forced to retire from the sport in April 2007 with a serious neck injury.
Egypt's Group 12 hopes have been hit by the withdrawal of striker Emad Moteab with a neck injury and lingering concerns over the fitness of Amr Zaki (knee).
He was on the verge of leaving the country when Italy's Emanuele Canonica withdrew with a neck injury, handing the British-born golfer a late place in the tournament.
Hughes was stretchered off against Donegal with a neck injury.
However, a neck injury saw him having to hang up his boots and hand on the captaincy to David Humphreys who led them to success against Colomiers at Lansdowne Road.
The Ospreys' back-row resources will be stretched with Andy Lloyd likely to miss the Munster tie with a neck injury, although Ryan Jones should be back after a rib problem.
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It has decided to immediately take any child with a head or neck injury out of the game, and to require a doctor's note to allow that child to play again.
The surgery was recommended as a "precautionary measure" after the nodule was discovered during an examination for a chronic neck injury that she has checked from time to time, Johnston said.
Schumacher, who had been set to replace the injured Massa at Ferrari last season until a lingering neck injury ended his first comeback attempt, was happy with his opening effort for Mercedes.
Bjorn is playing catch-up in the Ryder Cup race after being ill for over a month late last year and then missing five more weeks with a neck injury earlier this season.
In her blog she wrote about travelling on dirt tracks in the isolated rural area and revealed how she suffered a neck injury in a previous road accident earlier in the month.
Sorensen was forced off at half-time with a neck injury and, after the re-start, Villa immediately looked to test his replacement Steve Simonsen with a series of aerial balls into the box.
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