Answer
Sophie, most likely suffers from bursitis of the subcutaneous prepatellar bursa (sac of fluid between two bones or cartilage and bone). This is probable as Sophie spends a good deal of time on her knees (scrubbing the floors), and/or standing up for long periods of time.
Work Step by Step
Sophie, most likely suffers from bursitis of the subcutaneous prepatellar bursa (sac of fluid between two bones or cartilage and bone). This is probable as Sophie spends a good deal of time on her knees (scrubbing the floors), and/or standing up for long periods of time.