La redondance des mesures de hauteur rotulienne. Analyse de corrélation

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• 作者：Sergio Figueiredo ; ^{sergio.figueiredo@gmail.com" class="auth_mail" title="E-mail the corresponding author} ; Luis Barros ; Luis Coutinho ; Adelio Vilaca
• 刊名：Revue de Chirurgie Orthopédique et Traumatologique
• 出版年：2016
• 出版时间：November 2016
• 年：2016
• 卷：102
• 期：7_supp_S
• 页码：S158-S159
• 全文大小：65 K

文摘

Most patellar-height measurement methods (PHMM) differ slightly in regards of their anatomical references. Current studies mostly rely on author's choice, as no method has proven to be significantly greater than any other regards of function or pain transcription. For any given patient, or more particularly to one of his her knees, it would be expected for current PHMM to be redundant. This would attest for their validity in pathological situations. Our aim was to compare the three most well known PHMM with one relying in different anatomical landmarks to seek for redundancy.

Materials and methods

We performed a retrospective analysis of 150 patients (75 women; 75 men) followed-up at our institution while recovering from traumatic isolated knee injuries which had had contralateral (healthy knee) side x-ray films, at 30 degrees of flexion, as a means of control. Three orthopedic surgeons evaluated the latter films for commonly used PHMM (Blackburne-Peel, Insall-Salvati, Caton-Deschamps), as well as one depending solely on angle relationships (patellar-height angle). All four PHMM were then correlated using Pearson's coefficient, seeking for redundancy between the three first methods and also how these would relate with patellar-height angle. Whenever a correlation was found, a regression model was sought. Statistical analysis was ran through IBM SPSS Statistics version 20.0.0, considering statistical significance for a p-value under 0,05.

Results

Mean patients’ age was 54,84A20, 76 years-old. median PHMM at 0,92 (interquartile range- 0,25) for Blackburne-Peel, 1,05 (interquartile range- 0,23) for Insall-Salvati, 1,02 (interquartile range- 0,27) for Caton-Deschamps and 24,20O (interquartile range- 4,25O) for patellar-height angle. Significant correlation was not found between the three major measurement methods. Only Caton-Deschamps’ achieved a statistically significant correlation with patellar-height angle (P < 0,001). The latter correlation seemed to draw itself by the model- (Caton-Deschamps) = 0,396 + 0,027 (patellar-height angle) (P < 0,001 for the defined constant).

Discussion

PHMM results differ significantly when dealing with a healthy knee at 30 degrees of flexion, despite using nearly the same anatomical landmarks. Only Caton-Deschamps and patellar-height angle measurements pair, and in a strong correlation. Neither pathological knees nor different x-ray angle measurements were analyzed, diminishing the external validity of this study. Age and gender were also not taken into account.

Conclusion

PHMM seem not to be conclusive in analyzing patellar height, despite nearly using the same anatomical landmarks. Caton-Deschamps strongly correlates with patellar-height angle, thus increasing the likeliness for these to offer a better analysis of patellar conditions.