[Experience in orthopaedic surgery with minimum provider volumes].

The implementation of minimum provider volumes in orthopaedic surgery appears to be logically evident. A general volume outcome relationship could be found for total knee and hip replacement on a high level of evidence, but no definite threshold value could be identified. For other orthopaedic procedures the evaluated data hint at a volume outcome relationship but do not prove one. Preliminary model calculations on the effects of a regulation based on volume outcome considerations concerning medical care in Germany show that, though for total hip and knee replacement quite a large number of hospitals would be excluded from medical care, the number of patients to be reallocated would be small. Since 1 January 2007 a minimum provider volume of 50 total knee replacements per year per hospital has been mandatory in Germany. The further application of a minimum requirement regulation based on volume outcome considerations in the German health care system must be performed very carefully, because significant effects are to be expected.