Knee replacement surgery is becoming more common.
That is the main conclusion from a new study from Finland, which assessed the incidences of the procedure in those aged between 30 and 59 during 1980 and 2006.
They saw that there was a 130-fold increase in the number of knee replacement ops throughout the period, rising from 0.5 operations per 100,000 people to 65 operations by 2006.
"Our study confirmed rapid growth in incidences of partial and total knee arthroplasty in those less than 60 years of age," said Dr Jarkko Leskinen, an orthopaedic surgeon at Helsinki University Central Hospital and lead author of the report.
He explained that knee problems were becoming more commonplace in younger patients, as they are experiencing an increased risk of joint failure.
Arthritis Research UK states that the benefits of knee replacement surgery to patients can include improved mobility, quality of life and less pain.