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Articles by K. L. Cameron
Total Records ( 2 ) for K. L. Cameron
  M. S Todd , S Lalliss , E Garcia , T. M DeBerardino and K. L. Cameron

Two previous studies have examined the association between an increased posterior tibial slope and anterior cruciate ligament (ACL) injuries as measured on plain radiographs. The study results were contradictory, with 1 reporting a statistical difference and the other showing no association.


To determine if there is a difference in posterior tibial slope angle between patients with a history of noncontact ACL injury and a control group with no history of ACL injury. A secondary objective was to examine differences in tibial slope angle between male and female subjects within each group.

Study Design

Case-control study; Level of evidence, 3.


We identified all noncontact ACL injuries that were treated operatively at the United States Military Academy, West Point, New York, from 2004 to 2007. We digitally measured the posterior tibial slope from plain film radiographs of 140 noncontact ACL injuries, stratified them by sex, and compared them with a control cohort of 179 patients and radiographs.


Subjects in the noncontact ACL group had significantly greater slope angles (9.39° ± 2.58°) than did control subjects (8.50° ± 2.67°) (P = .003). The trend toward greater tibial slope angles in the noncontact ACL group was also observed when each sex was examined independently; however, the difference was only statistically significant for the female subjects between the injury and control groups (9.8° ± 2.6° vs 8.20° ± 2.4°) (P = .002).


Despite the identification of an increased posterior tibial slope as a possible risk factor for women, more research that combines the multifactorial nature of an ACL injury must be performed.

  M Hsiao , B. D Owens , R Burks , R. X Sturdivant and K. L. Cameron

Background: Although some studies have reported an increased incidence of patellar dislocations within active populations, few studies have reported incidence rates and examined risk factors for this injury.

Purpose: To examine the incidence of patellar dislocation injuries and the influence of demographic and occupational risk factors associated with injury among active-duty United States (US) service members between 1998 and 2007.

Study Design: Cohort study; Level of evidence, 3.

Methods: Using the Defense Medical Surveillance System, a search was performed for International Classification of Disease, 9th Revision (ICD-9) code 836.3 among all US service members on active duty during the study period. Multivariable Poisson regression analysis was used to estimate the rate of patellar dislocation per 1000 person-years at risk to injury. Incidence rates (IRs) and incidence rate ratios (IRRs) for patellar dislocation along with 95% confidence intervals (CIs) were estimated by gender, age, race, branch of military service, and rank while controlling for the other variables in the model.

Results: There were a total of 9299 individuals with documented patellar dislocation injuries among a population at risk of 13 443 448 person-years. The IR was 0.69 per 1000 person-years at risk. Women were 61% more likely (IRR, 1.61; 95% CI, 1.53-1.69) to sustain a patellar dislocation injury than men. Rates were highest in the youngest age group and decreased with increasing age. Service members aged <20 years were 84% more likely (IRR, 1.84; 95% CI, 1.61-2.10) to sustain a patellar dislocation injury as service members aged ≥40 years. Differences were also noted by race, service, and rank.

Conclusion: The incidence of patellar dislocation injuries among US service members was an order of magnitude greater than that previously reported in civilian population studies. Gender, age, race, rank, and branch of military service are important risk factors related to the incidence of patellar dislocation injuries in this population.

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