Final answer:
The Holmblad method's primary advantage for a tunnel view of the knee is that it is easier for the patient compared to the Camp Coventry method, providing a more comfortable position during the X-ray examination.
Step-by-step explanation:
The primary advantage of utilizing the Holmblad method over the Camp Coventry method for a tunnel view of the knee is that the Holmblad method is easier for the patient. Medical imaging, including X-ray examinations of the knee, can be done using different techniques, each with its own method of positioning and viewing the knee joint. The Holmblad method offers a more comfortable position for patients with knee conditions, whereas other methods, like Camp Coventry, may require the patient to assume a more strenuous position.