Objective
To (1) define the population-based incidence of OCD lesions of the knee using the population of Olmsted County, (2) examine trends over time, and (3) evaluate changes in the rate of surgical management.
Method
The study population included 302 individuals who were diagnosed with knee OCD lesions between January 1, 1976 and December 31, 2014. The complete medical records were reviewed to confirm diagnosis and to extract injury and treatment details. Age- and gender-specific incidence rates were calculated and adjusted to the 2010 US population. Poisson regression analyses were performed to examine incidence and surgery trends by age, gender, and calendar period.
Results
The overall age- and gender-adjusted incidence annual incidence of knee OCD lesions was 6.09 per 100,000 person-years. The incidence was significantly higher (P<0.001) in males (8.82, 95% CI 7.63 to 10.00 per 100,000) compared to females (3.32, 95% CI 2.61 to 4.04 per 100,000). Age- and gender-specific incidence was highest in both males and females in the 11–15 years old at 39.06 and 16.15 per 100,000, respectively. In males aged 11 to 15 years, OCD incidence increased significantly over the study period from 20.68 in 1976–1985 to 48.16 in 2006–2014 (per 100,000).
Conclusions
The overall age- and gender-adjusted annual incidence of knee OCD lesions in the Olmsted Country Population was 6.09 per 100,000 person-years with a significantly higher incidence in males compared to females. The highest incidence for both males and females occurred between the ages 11 to 15 years. Trends indicate increasing OCD incidence in younger males and decreasing surgical management in females over the last decade.