Effects of Unbalanced and Balanced Applied Loads on Norbergs Angle in Ventrodorsal Hip-Extended Radiographies

Abstract

Two radiographic distraction techniques (Standard Ventrodorsal Hip-Extended Radiography, SHER, and Balanced Hip-Extended Radiography, BHER) were evaluated for Canine Hip Dysplasia (CHD) diagnosis on 100 hip joints of 50 dogs to determine the most reliable method in the detection of higher hip laxity employing Norbergs-Olsson angle (NoA) evaluation (FCI hip scoring). Anesthesia was standardized due to uniformity in muscle relaxation and applied to extend loads (SHERKg and BHERKg) were measured on hind legs using electronic weight scales (EWS) simultaneously with ventrodorsal (V/D) radiography. Results of NoA scores were evaluated statistically together with weight scale (WS) values. Significant differences were found between groups of methods for both in WS results (p<.001) and NoA evaluations (p<.001). The difference between right and left sides in WS results was not found significant (p>.05). Even if there was no significant difference occurred in this, balancing the loads with the BHER method caused a significant difference in NoA values between tested methods (p<.001). Moreover, the linear, positive, and strong correlation between SHER and BHER methods was shown the reliability of the BHER method in NoA evaluations (rs= .910, p<.001). In conclusion, by having a positive and strong correlation with the standard method, and better outcomes in FCI hip scoring with lower misdiagnose frequency thus affecting the clinical outcome, the BHER method was offered as a reliable method in the diagnosis of CHD.

Keywords

• canine hip dysplasia
• norberg’s angle
• balanced hip extended
• ventrodorsal hip extended
• radiography

Dengelenmış ve Dengesiz Gerilim Kuvvetlerinin Köpeklerde Ventro-Dorsal Kalça Görüntülenmesinde Norbergs Açısı Üzerine Etkileri

Öz

İki radyografik distraksiyon tekniği (Standart, SHER ve Dengelenmiş Radyografi, BHER) köpek kalça displazisinin değerlendirilmesinde 50 köpeğin 100 kalça ekleminde değerlendirildi ve sonuçlar Norberg-Olsson (NoA) açı derecesi temelinde ele alındı (FCI skorlama). Anestezik yöntem kas gevşemesi yönünden standardize uygulandı. Arka ayaklara uygulanan çekme kuvvetleri (SHERKg ve BHERKg) radyografiler sırasında elektronik yük ölçer (WS) alet vasıtası ile ölçüldü. NoA ölçüm sonuçları yük ölçer sonuçları birlikte istatistiksel yönden değerlendirildi. NoA açısı (p<.001) ve WS sonuçlarında gruplar arasında istatistiksel yönden anlamlı sonuçlar belirlendi. WS sonuçlarında sağ ve sol ayak tarafları arasında fark belirlenmedi (p>.05). BHER metodunda kullanılan dengeleyici çekme kuvveti sonucunda NoA ölçümlerinde anlamlı farklılık oluştuğu görüldü (p<.001). SHER ve BHER metodları arasında istatistiksel yönden lineer, pozitif ve güçlü bir korrelasyon bulunması BHER metodunun güvenilirliği yönünde değerlendirildi (rs= .910, p<.001). Karar aşamasında; uygulanan BHER metodunun FCI skorlaması yönünden daha az yanlış tanı bulgusu göstermesi neticesinde klinik aşamada köpek kalça displazisinin belirlenmesinde güvenilir bir metod olduğu ve meslektaşlarımıza önerilebileceği sonucuna varıldı. 

Anahtar Kelimeler

• köpek kalça displazisi
• norbergs açısı
• dengelenmiş kalça gerdirme
• ventrodorsal kalça gerdirme
• radyografi

Kaynakça

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