Rank: New forum user 
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I have recently been asked what the particular impact is of bending copper pipe on the knees. Has anybody got anything more than standard muscoskeletal problems i.e. particular injuries etc.
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Rank: Super forum user 
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Hi Colin,
The first thing that springs to my mind is crushed pipes? Is this to be done using spring benders? If so, they'd be just as likely to injure themselves getting the springs out!
Irrespective of the potential for injury, I'd be very dubious of the quality of the workmanship if I discovered that the pipes had been bent over someones knee.
Is this microbore pipe by any chance?
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Rank: Super forum user 
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Hi Colin,
Across the top of the knee [if bent] are the quadricep tendons and muscles and tendons, which can be injured damaged by direct compression in a one-off, if this were to be repeated continuously then the scope for injury and permanent damage is obvious. Acute tendonitis [inflammation of the tendon] would be the acute reaction, but permanent damage could lead to de-stabilisation of the joint and huge problems in later life.
Can't see the reason for bending pipes across knee's when pipe-benders are relatively inexpensive and easy to use.
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Rank: New forum user
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Thanks so far. This technique is still taught as part of the plumbing trade and is recognised as more than satisfactory for bending pipes with external spring up to 10mm bore and internal spring for 10-15mm pipe. It is even taught for chrome finished pipe. The more ideas i get the more i can pass on. Many thanks
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Rank: Forum user
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Are electricians still bending PVC conduit over the knee?
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Rank: Super forum user 
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Yep!
Less force than copper, but probably damaging none the less!
Especially when done below the knee cap rather than above to get a tighter bend?
Trouble with white pvc is it often is damaged by conduit benders and clients often won't accept the visual damage.
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