Q: Given a passage with a question and an answer to that question, classify if the answer actually answers the question into 'yes' or 'no'. Output 'yes' if the answer answers the question and output 'no' if the answer does not answer the question.
Question: Are weight bearing radiographs necessary for measurement of polyethylene penetration in total hip prostheses : a radiostereometric study of 111 patients examined in weight-bearing and supine position?
Answer: The small systematic difference in penetration values between the supine and the weight-bearing positions is of no clinical or methodological importance.
A:
no