Spanish you're thinking jousting lances were meant to break on impact...not regular lances used in combat.
http://www.medievalwarfare.info/weapons.htm#lancesWhile it could still be generally classified as a spear, the lance tends to be larger - usually both longer and stouter and thus also considerably heavier, and unsuited for throwing, or for the rapid thrusting, as with an infantry spear.
Lances did not have spear tips that (intentionally) broke off or bent, unlike many throwing weapons of the spear/javelin family, and were adapted for mounted combat. They were often equipped with a vamplate, a small circular plate to prevent the hand sliding up the shaft upon impact. Though perhaps most known as one of the foremost military and sporting weapons used by European knights, the use of lances was spread throughout the Old World wherever mounts were available. As a secondary weapon, lancers of the period also bore swords, maces or something else suited to close quarter battle, since the lance was often a one-use-per-engagement weapon; after the initial charge, the weapon was far too long, heavy and slow to be effectively used against opponents in a melee.
Because of the stopping power of a thrusting spear, it quickly became a popular weapon of footmen in the Late Middle Ages. These eventually led to the rise of the longest type of spears ever, the pike. Ironically, this adaptation of the cavalry lance to infantry use was largely tasked with stopping lance-armed cavalry charges. During the 15th, 16th and 17th centuries, these weapons, both mounted and unmounted, were so effective that lancers and pike men not only became a staple of every Western army, but also became highly sought-after mercenaries.
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