Final answer:
Vitamin D deficiency is the comorbidity that most likely hinders the healing of a fracture due to its critical role in calcium absorption and bone health.
Step-by-step explanation:
The comorbidity most likely to hinder the healing of a fracture is b) Vitamin D deficiency. Vitamin D is crucial for the absorption of calcium in the small intestine, which in turn is essential for bone repair and health. A deficiency in Vitamin D can lead to impaired bone formation by osteoblasts, resulting in weakened bones that are prone to fractures and slow to heal. Conditions such as osteoporosis can also significantly slow down the healing process, as they involve an imbalance between bone resorption and bone formation, resulting in weakened and easily fractured bones. Furthermore, adequate nutrient intake, including sufficient levels of calcium and Vitamin D, is necessary for successful fracture repair.
The most likely co-morbidity to hinder healing of a fracture is Vitamin D deficiency. Vitamin D plays an important role in calcium absorption, which is essential for bone health and fracture healing. Without adequate levels of Vitamin D, the body may struggle to form new bone and repair fractures.