system
Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
According to Boyd's classification, when the pain continues but the patient can still walk with effort is:
assistant
The correct answer is  Boyd’s classification:

Grade I: pain disappears, if the patient continues to walk
Grade II: pain continues, but the patient can still walk with effort
Grade III: pain compels the patient to take rest.