Extensor Mechanism Injuries of the Knee: Demographic Characteristics and Comorbidities from a Review of 726 XXXX Records.

@entity1 @entity174 @entity924 @entity397 @entity1796 @entity121
BACKGROUND: The purpose of our study was to describe and compare extensor mechanism injuries with regard to age, sex, body mass index (BMI), and comorbidities. METHODS: We identified @entity1 who had undergone surgical management of an extensor mechanism injury at two institutions between 1986 and 2012. Data analyzed included age at the time of surgery, sex, height, weight, and the presence of medical comorbidities. @entity1 with chronic @entity121 , those undergoing revision surgery, or those with injuries in the setting of total knee arthroplasty were excluded. RESULTS: Seven hundred and twenty-six @entity1 were included. There were 427 (58.8%) patellar @entity174 , 210 (28.9%) @entity121 @entity397 , and eighty-nine (12.3%) patellar @entity397 . Sixty-seven percent of the patellar @entity174 occurred in females, while 91% of the @entity121 and 95.5% of the patellar @entity397 occurred in males (p < 0.001). Age distribution was significantly different among the groups: the mean @entity1 age (and standard deviation) was 61.0    13.1 years (range, twenty to ninety-two years) for @entity397 , 56.3    17.4 years (range, sixteen to ninety-one years) for @entity174 , and 39.5    12.2 years (range, eighteen to seventy-two years) for @entity397 . @entity174 showed a bimodal distribution with regard to both age and sex: the median age of females was sixty-two years (range, sixteen to ninety-one years), and the median age of males was forty-seven years (range, sixteen to ninety-one years) (p < 0.001). BMI varied significantly among the cohorts: a mean of 25.0    5.2 kg/m(2) for @entity174 , 28.7    4.97 kg/m(2) for @entity397 , and 30.0    6.05 kg/m(2) for @entity397 (p < 0.001). Ninety-six percent of the females with a @entity1796 had an underlying medical comorbidity compared with 68% of the males (p = 0.008). Of the @entity1 with underlying comorbidities, 61% of the females had comorbidities that were considered to be risk factors for @entity924 compared with 34% of the males (p = 0.008). CONCLUSIONS: Females with an extensor mechanism injury are more likely to sustain a @entity174 compared with males. Younger males are more likely to sustain a @entity174 or @entity397 ; however, we found that 43% of the patellar @entity397 were in @entity1 over the age of forty. Medical comorbidities were common with @entity397 , and we found that they were significantly more common in females than in males. CLINICAL RELEVANCE: Surgeons treating female @entity1 with a tendinous extensor mechanism disruption should have a low threshold to initiate a medical work-up in search of a possible undiagnosed medical comorbidity.
