Effect of elbow position on radiographic measurements of radio-capitellar alignment

• 作者: Dominique M Rouleau Emilie Sandman Fanny Canet G-Yves Laflamme George S Athwal Yvan Petit
• 来源期刊: 世界骨科杂志
• 学科: 医学
• 关键词: ELBOW SUBLUXATION Radiocapitellar ratio ELBOW ELBOW DISLOCATION
• 年，卷（期）: 2016,（2）
• 页码范围: 117-122
• 页数: 6页
• 分类号: R

摘要

AIM:To evaluate the effect of different elbow and forearm positions on radiocapitellar alignment.METHODS:Fifty-one healthy volunteers were recruited and bilateral elbow radiographs were taken to form a radiologic database.Lateral elbow radiographs were taken with the elbow in five different positions:Maximal extension and forearm in neutral,maximal flexion and forearm in neutral,elbow at 90°and forearm in neutral,elbow at 90°and forearm in supination and elbow at 90°and forearm in pronation.A goniometer was used to verify the accuracy of the elbow’s position for the radiographs at a 90°angle.The radiocapitellar ratio(RCR)measurements were then taken on the collected radiographs using the SliceOmatic software.An orthopedic resident performed the radiographic measurements on the 102 elbows,for a total of 510 lateral elbow radiographic measures.ANOVA paired t-tests and Pearson coefficients were used to assess the differences and correlations between the RCR in each position.RESULTS:Mean RCR values were-2%±7%(maximal extension),-5%±9%(maximal flexion),and for elbow at 90°and forearm in neutral-2%±5%,supination 1%±6%and pronation 1%±5%.ANOVA analyses demonstrated significant differences between the RCR in different elbow and forearm positions.Paired t-tests confirmed significant differences between the RCR at maximal flexion and flexion at 90°,and maximal extension and flexion.The Pearson coefficient showed significant correlations between the RCR with the elbow at 90°-maximal flexion;the forearm in neutralsupination;the forearm in neutral-pronation.CONCLUSION:Overall,95%of the RCR values are included in the normal range(obtained at 90°of flexion)and a value outside this range,in any position,should raise suspicion for instability.