Clinical Performance and Safety of the Unicompartmental Univation® XF Pro Implant

Functional patient-reported outcome

The Oxford Knee Score (OKS) is a reliable 12-item, patient-reported questionnaire originally developed and validated specifically to assess function and pain in patients undergoing total knee replacement. It is short, reproducible, valid and sensitive to clinically important changes over time. Each of the 12 questions on the OKS is scored in the same way with the score decreasing as the reported symptoms increase (i.e. become worse). All questions are laid out with response categories denoting least (or no) symptoms to the left of the page (scoring 4) and those representing greatest severity lying on the right hand side (scoring 0), as detailed for question 1 below. This method, when summed, produces overall scores running from 0 to 48 with 48 being the best outcome.

Implant survival [Kaplan-Meier]

Kaplan-Meier Analysis is a standard statistical method to describe the survival of human subjects or medical products over a defined time period.

Quality of Life [EQ-5D-5L] compared to baseline

The 5-dimension 5-level measure of the health status, developed by the EuroQol Group (EQ-5D-5L) is a simple and generic measure for clinical and economic assessment. Instructions for the user are directly included into the questionnaire and it consists of two pages. One cover five different dimensions (mobility, self care, usual activities, pain/discomfort, anxiety/depression) and the other one the EQ visual Analogue Scale (EQ-VAS). The VAS scale records the self rated health status of the patient from the level "the worst health you can imagine" to "the best health you can imagine". The answer of each of the five dimensions result in a 1-digit number that expresses the level selected for that dimension. The digits for the five dimensions can be combined into a 5-digit number that describes the patient's health state.

Progress of Clinical Outcome [Forgotten Joint Score-12] over follow-up period

The Forgotten Joint Score-12 (FJS-12) Knee was designed to assess patient outcome in patients undergoing conservative or operative treatment of the knee. These Patient Reported Outcome (PRO) questionnaires focus on patients' awareness of a specific joint in everyday life. In 12 Items the awareness for the artificial joint is assessed by the patient, each on a five point scale (Never / Almost Never / Seldom / Sometimes / Mostly) The Forgotten Joint Score assessment consists of 12 questions and is scored on a 0-100 scale. The higher the score, the less the patient is aware of their affected joint when performing daily activities

Radiological assessment: axis alignment (long leg x-ray) over time

Radiographs shall be standardized between centres as far as possible. Unless limited by patient or equipment constraints, all follow-up imaging examinations will be obtained according to the radiographic protocol of the hospital and the set routine. The radiographic evaluation of Alignment is based on long-leg x-rays