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The Outcomes of Two Knee Scoring Questionnaires in a Normal Population

Louisiana State University Medical Center, Department of Orthopaedic Surgery, New Orleans, Louisiana

* Address correspondence and reprint requests to Carlos A. Guanche, MD, Assistant Professor of Orthopaedic Surgery, Louisiana State University Medical Center, 2025 Gravier Street, Suite 400, New Orleans, LA 70112

The Noyes and Lysholm knee scoring questionnaires, commonly used for follow-up assessment after knee surgery, were developed based on knees with preexisting pathologic changes and have not been standardized to normal knees. We administered both questionnaires to normal subjects. Any subject reporting a history of injury or surgery to either knee, or preexisting knee pathologic changes, was excluded. From a total of 492 knees evaluated, 418 knees (253 male, 165 female) qualified for statistical analysis. The average age of the group was 17.6 years (range, 13 to 25). For male subjects, the total Noyes and Lysholm scores averaged 99.10 (range, 68 to 100) and 99.10 (range, 77 to 100), respectively. For female subjects, the average Noyes and Lysholm scores were 97.82 (range, 72 to 100) and 97.16 (range, 75 to 100), respectively. The 95% confidence interval computed for each of these groups did not contain the maximal value of 100. The female athletes reported significantly lower total scores than the male athletes on both questionnaires. For the Lysholm questionnaire, the male athletes scored significantly lower than the maximum in all categories except support and stair climbing, and the female athletes scored significantly lower than the maximum in all categories except limp and thigh atrophy. The range of scores found in this highly selected, "normal" population exemplifies the need for more accurate instruments in the evaluation of knee surgical outcomes.

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