Young pigs on concrete or other hard floors often develop pressure related lesions on the knees, coronets or at other sites over bony prominences. Although lesions may appear insignificant initially, they may become infected and lead to bacteremia with metastasis to joints or other sites, most frequently with Streptococcus spp or Arcanobacterium pyogenes. Losses can be substantial. Prevention is achieved through good sanitation, provision of good quality flooring materials, and use of floor mats.