Fong Bianca F, Savelsbergh Geert J P, Leijsen Maaike R, de Vries Johanna I P
Research Institute MOVE, Faculty of Human Movement Sciences, VU University, Amsterdam, The Netherlands.
Early Hum Dev. 2009 Mar;85(3):201-6. doi: 10.1016/j.earlhumdev.2008.10.003. Epub 2008 Nov 20.
The aim of our study was to examine the effect of prenatal breech presentation on postnatal leg posture. Twelve infants were born after breech presentation and nine infants after cephalic presentation participated. At 2, 4, 6, 12 and 18 weeks postnatal age leg posture was examined during general movements in supine and vertical position.
Transient differences in hip posture between the groups were observed during the first 6 weeks postnatal age, with significantly more hip flexion and less hip extension in the breech group. For knee extension, differences between the groups were not statistically significant. Changing from supine to vertical position, the breech group demonstrated a significant increase in hip extension, with no significant changes in hip posture for the cephalic group. For both groups the vertical condition resulted in a significant increase in knee extension. Continuity from pre- to postnatal life was found for hip posture in both groups and for knee extension only in the breech group.
Significant differences between breech and cephalic-born infants were found during the first 6 weeks after birth and mainly concerned hip posture and not knee posture. An increase in gravitational force has more impact on leg posture in the breech than in the cephalic group. The observed differences in hip posture between the studied groups were found to be transient, however, in the long term subtle differences still remain between the groups.
我们研究的目的是检查产前臀位对产后腿部姿势的影响。12名臀位出生的婴儿和9名头位出生的婴儿参与了研究。在出生后2周、4周、6周、12周和18周时，在仰卧位和垂直位的一般运动过程中检查腿部姿势。
在出生后的前6周内观察到两组之间髋关节姿势存在短暂差异，臀位组髋关节屈曲明显更多，伸展更少。对于膝关节伸展，两组之间的差异无统计学意义。从仰卧位变为垂直位时，臀位组髋关节伸展显著增加，头位组髋关节姿势无显著变化。对于两组，垂直状态均导致膝关节伸展显著增加。两组在髋关节姿势以及仅在臀位组的膝关节伸展方面发现了从出生前到出生后的连续性。
臀位出生和头位出生的婴儿在出生后的前6周内存在显著差异，主要涉及髋关节姿势而非膝关节姿势。重力增加对臀位组腿部姿势的影响比对头位组更大。然而，研究组之间观察到的髋关节姿势差异是短暂的，从长期来看，两组之间仍然存在细微差异。
