Femoral neck anteversion among five canid taxa.

Area of Science:

• Comparative anatomy
• Canid bone biology
• Biomechanics

Background:

• Proximal femoral angles (anteversion and inclination) are studied in human and canine bone biology.
• Research in humans often addresses hip and knee joint pathology correction.
• Canine studies aim to understand carnivoran bone biology.

Purpose of the Study:

• To test the hypothesis that significant variability exists within and across canid taxa for proximal femoral angles.
• To determine if taxon-specific differences in femoral anteversion and inclination are statistically significant.
• To explore correlations between these angles and femur length.

Main Methods:

• Museum specimens from five canid taxa (gray wolf, domestic dog, coyote, gray fox, red fox) were analyzed.
• Surface scans were used to extract axes for femoral neck-shaft and distal femoral condyles.
• Kruskal-Wallis tests and Spearman rank correlation were employed for statistical analysis.

Main Results:

• No statistically significant differences were found among the canid taxa for femoral neck anteversion or angle.
• Femoral neck anteversion and angle showed significant correlation with each other across all taxa.
• Femur length did not significantly correlate with either proximal femoral angle.

Conclusions:

• Proximal femoral angles exhibit considerable intra-taxon variability, particularly anteversion.
• The observed measurements likely represent naturally occurring biological phenomena rather than taxon-specific adaptations.
• Canid taxa do not show statistically significant differences in these specific proximal femoral measurements.