This is an observational, prospective study that has the primary goal of validating the Forgotten Joint Score (FJS)

This is an observational, prospective study that has the primary goal of validating the Forgotten Joint Score (FJS) as described by Behrend and Giesinger in 2012. Patients will be given two self-assessment questionnaires (WOMAC and FJS) to perform internal consistency analysis, reliability and comparability of results in a population of people undergoing total knee replacement prosthetic surgery.

Comparison of data will be done for each patient by evaluating the evolution of the postoperative period, comparing the results obtained with a well known validated score (WOMAC).

Questionnaires will be given pre-operatively, at 6 month ± 2 weeks, and 12 month ± 1 weeks after surgery.

Inclusion Criteria:

• Males and females
• Age range between 55 and 85 years
• Italian mother-tongue
• Patients with unilateral gonarthrosis who need total knee prosthesis

Exclusion Criteria:

• Patients with orthopedic pathologies of other origin
• Patients with history of previous articular prosthetic replacement surgery on joints of the lower limb.
• Patients with history of previous major cardiovascular events
• Patients who need aids for walking
• Patients claiming that they can not submit to follow-up and therefore can not complete the study

Patients of both gender, aged between 55 and 85 years old, Italian mother-tongue with unilateral gonarthrosis who need total knee prosthesis