27/03/2026
Dogs castrated at 6 months may be at higher risk of cranial cruciate ligament (CrCL) rupture later in life. Here is why:
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S£x hormones play a critical role in regulating growth plate closure. When a dog is castrated early, there is a disruption to those hormones before growth is done. The proximal tibial growth plate closes prematurely, but the distal femoral growth plate continues to grow, altering the bone geometry (Torres de la Riva et al., 2013; DeForge et al., 2024).
🦴 This results in a more upright stifle and an increased tibial plateau angle (TPA) — meaning the tibia sits at a steeper slope. During weight-bearing, this generates greater cranial tibial thrust, placing excessive strain on the CrCL.
🐕 While small breeds approach unaffected, this predisposition has been found in larger breeds, specifically in Rottweilers, a breed already overrepresented in CrCL rupture studies (Waters et al., 2023).
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