But concern has been emerging for some time about certain types of metal-on-metal hips, in particular those where the ball head has a diameter of 36mm or more.
Other unlikely adornments are the baseball-size orbs sitting atop its legs, evoking traditional Indian ball-head war clubs.
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The Spurs goalkeeper was soon shaking his head again at Mido after the Egyptian unsuccessfully tried to clear the ball with his head, requiring Robinson to throw himself to his right to tip away the ball.
It was Frimpong and Kightly who combined for Wolves' equaliser, with the on-loan midfielder flicking the ball over his head to escape his markers before quickly passing the ball to the Wolves winger.
Italy left two strikers forward and the tactic paid off as Riccardo Montolivo swept a long ball over the head of Philipp Lahm, allowing Balotelli to chest the ball down and run clear before smashing an unstoppable shot beyond a stunned Manuel Neuer.
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Ugly scenes followed the challenge and Barton threw the ball against the head of an opposition player.
Sangakkara played elegantly before he slashed a wide ball from Liam Plunkett to point, where Kyle Coetzer parried the ball above his head and caught it at the fourth attempt.
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Immediately, Calderwood sent on Owens and within three minutes the substitute had pinged a perfect ball onto the head of Kyle and the Scotland cap bulleted a header into the net.
Tamim had raced to 35 when he dragged a slower ball from Stuart Broad to mid-on but Alastair Cook, having parried the ball above his head, could not pouch a fairly routine rebound.
The midfielder was picked out by Kuyt's throw-in on the right and drove down the byline before cheekily thrashing the ball over the head of a crouching Mignolet from the tightest of angles.
He was brilliantly taken by Smith, who managed to catch the ball above his head on the long-on boundary but keep his balance and stay inside the ropes, giving the impressive Henriques a third wicket.
It was the second match in four days where Ferguson has courted controversy, having claimed that his striker Robin van Persie "could have been killed" after Swansea's Ashley Williams kicked a ball at his head in Sunday's 1-1 draw.
Cardiff's revival began with 25 minutes to go as Campbell poked the ball in with his head after Bradley Middleton had headed across goal from a high ball into the box.
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"What has often been indicated in these studies is that people who head a lot compete to head the ball, and in those circumstances they may clash heads and get elbows to the head, which can cause concussion, " he told CNN.
The home side recycled the ball, but a nasty head-to-head collision between Glasgow full-back Kenny Logan and Scarlets No 8 Dave Hodges saw the ball fall into Lamont's arms.
"They're not your big, strapping, 6-foot-5 machines that head the ball and run all day, " Monk said.
Soon after Blackpool won a corner and Barker rose well to head the ball into the roof of the net.
When playing soccer, I always thought you had to be nuts to launch yourself into the air and head the ball.
With 17 minutes remaining a fine run and cross by left-back Somwe Joel saw the unfortunate Omodiagbe head the ball past substitute goalkeeper Ikechukwu Ezenwa.
Minutes later, Collins' shot cleared the static Sorenson but full-back Kelly was on hand as the last line of defence to head the ball away to safety.
Robben was the architect, picking out Dante at the far post with looping cross to head the ball towards goal and allow Muller to nod the ball home.
Saganowski made no mistake with his second chance in the first minute of added time, as he dived to head the ball into the bottom corner from 12 yards.
But the Warriors seized the initiative after seven minutes when Ndlovu chipped the ball perfectly onto the head of Edzai Kasinauyo, marking his return to the team after a three-year absence.
Moments later, Carew glanced a header just wide of the far post from Milner's corner and Villa had a penalty shout rejected when Emiliano Insua appeared to head the ball on to his arm.
Wednesday came within inches of levelling shortly after the restart when Potter's free-kick took a deflection that left Camp stranded as the ball looped over his head and hit the woodwork before rebounding to safety.
Cole was also in the mix but his left-footed shot was battered away by Aaron Hughes and then, when he was unmarked again, he could do no better than head the ball into Niemi's arms.
It was his equalizer on 30 minutes which caught the eye, his ability to hang in the air and generate an unfathomable amount of power to head the ball into the net remains a joy to behold.
Scientists at Imperial College London examined the force of ball-to-head contact in soccer because it has been rarely studied compared with other types of head contact in the world's most popular sport, such as player head-to-head contact.
Rangers continued to enjoy possession in defence and midfield and were almost gifted a goal when Mindaugus Baguzis' attempt to head the ball back to his keeper missed his stranded team-mate, and the goal, by a few feet.
The ball slipped on my bald head and went into the net, a great feeling.
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