Final answer:
Incarcerated hernias cannot be reduced and are often painful, and femoral hernias are particularly susceptible to this condition due to the limited space defined by rigid anatomical structures.
Step-by-step explanation:
The term you are searching for is incarcerated hernias. Incarcerated hernias are those that cannot be reduced back into the abdominal cavity and are often associated with pain, nausea, and vomiting. Femoral hernias are indeed most prone to being incarcerated because the femoral canal is bounded by rigid anatomical structures such as the inguinal ligament, lacunar ligaments, and Cooper's ligament. These constraints limit the space available for the herniated tissue, making reduction difficult and increasing the risk of complications like incarceration and strangulation, where the blood supply to the entrapped tissue is compromised.