Can Hip Dysplasia Occur Purely from C-Section Birth?
No, cesarean section delivery alone does not cause developmental dysplasia of the hip (DDH)—in fact, C-section appears to be protective against DDH in breech-presenting infants, while vaginal delivery in breech position increases the risk.
Understanding the Evidence
The relationship between delivery mode and DDH is nuanced and depends critically on fetal presentation:
C-Section is NOT a Risk Factor for DDH
According to the 2019 ACR Appropriateness Criteria guidelines, the most important risk factors for DDH are female gender (relative risk 2.5), breech positioning in utero (relative risk 3.8), and positive family history (relative risk 1.4) 1. Notably absent from this list is cesarean delivery as an independent risk factor.
The guidelines explicitly state: "There is no increased risk for caesarean section in the absence of breech presentation" 2. This is a critical distinction—C-section itself does not cause DDH.
C-Section May Actually Be Protective in Breech Babies
The evidence shows the opposite effect when breech presentation is involved:
In breech-presenting infants delivered vaginally, there is a 4.7% rate of clinically significant DDH (Graf types III and IV) compared to only 1.1% in those delivered by elective C-section—a 4-fold increased risk with vaginal delivery 3
A systematic review of 9 cohort studies with 35,139 infants found that breech infants delivered by cesarean section had 13.5% lower risk for DDH compared to vaginal delivery (5.95% vs 6.88%) 4
Cesarean delivery was actually protective for late-diagnosed DDH 5
The Mechanism: Why Vaginal Delivery Increases Risk in Breech
The protective effect of C-section in breech presentation is thought to occur because:
- Vaginal delivery subjects the breech-positioned hip to increased uterine pressure during the active phase of labor, causing excessive stretch of the hip capsule 4
- C-section avoids this mechanical stress on the already vulnerable hip joint
- This suggests that the mode of delivery is the critical factor promoting dislocation in breech babies, not the breech presentation itself 4
Confirmed Risk Factors Based on Recent Meta-Analysis
A 2025 meta-analysis of 64,543 infants with ultrasound-verified DDH identified the actual risk factors 6:
- Breech presentation: OR 4.15
- Family history of DDH: OR 3.83
- Female sex: OR 2.50
- Oligohydramnios: OR 3.76
- High birth weight: OR 2.00
Cesarean delivery, primiparity, multiple births, low birth weight, and prematurity were NOT associated with DDH risk 6.
Clinical Implications
For your practice:
- Do not consider C-section delivery as a risk factor requiring DDH screening unless other risk factors are present
- Focus screening on the established risk factors: female gender, breech presentation, family history, and oligohydramnios 1, 6
- For breech-presenting infants, C-section may actually reduce DDH risk compared to vaginal delivery
- All infants should receive routine clinical hip examinations at birth and during well-baby visits regardless of delivery mode 1
Common Pitfall to Avoid
Do not conflate the increased DDH risk in breech presentation with the mode of delivery. The breech position itself creates the primary risk through in utero hip positioning and restricted mobility. The delivery mode then modulates this risk—with vaginal delivery potentially worsening it and C-section potentially mitigating it.