Stryker NTX Registry Scorpio NRG (Re-Energize), Triathlon Total Knee, Triathlon Partial Knee Resurfacing (PKR) With X3 Polyethylene Insert

Survivorship shown in Kaplan Meier survival curves (statistic used to estimate the survival function from lifetime data).

Time frame: Preoperative to 1 year, 1 year, 3 years, and 5 years. Survivorship is unavailable at 10 years due to study termination.

Population: This primary outcome measure (10 year) was not analyzed due to termination of the study. Results display number of participants at each timepoint (i.e., preoperative to 1 year, 1 year, 3 years, and 5 years) that remain free from revision; 10 year not reported due to study termination. Overall number of participants analyzed is based upon the preoperative to 1 year population, originally 223 participants with 4 early terms (no surgery), therefore n=219.

The EuroQol-5 Dimension (EQ-5D) is a subject-completed questionnaire designed to assess subject health state values. The EQ-5D consists of 2 areas; EQ-5D descriptive system and the visual analogue scale (VAS). The EQ-5D descriptive system comprises the following five dimensions: mobility self care, usual activities, pain/comfort and anxiety/depression. Each dimension has 3 levels indicating no problems, some problems or extreme problems. The index values on a scale between -1 (low) and 1 (high) are showing the average health status according to the 5 dimensions: A low score shows worse health and a high score shows better health. With the EQ VAS, the respondents can report their perceived health status with a grade ranging from 0 (the worst possible health status) to 100 (the best possible health status).

Time frame: Pre-operative, 1, 3, and 5 years. The EQ-5D for 7 and 10 year timepoints is unavailable due to study termination.

Population: Participants with available data through 5 years. Overall number of participants analyzed is based upon the pre-operative population with EQ-5D data available. Number of Analyzed Participants at the Preoperative timepoint for this assessment (EQ-5D) is fewer than overall due to two participants not completing the preoperative questionnaire, therefore n=221.

KOOS consists of 5 subscales: Symptoms, Pain, Function in Daily Living, Function in Sport and Recreation, and knee related Quality of Life (QOL). The previous week is the time period considered when answering the questions. Standardized answer options are given for each subscale (5 Likert boxes) and each question is assigned a score from 0 to 4. A normalized score is calculated for each subscale, with a minimum of 0 indicating extreme symptoms and a maximum of 100 indicating no symptoms. Only subscale scores are reported.

Time frame: Pre-operative, 1, 3, and 5 years. The KOOS for 7 and 10 year timepoints are unavailable due to study termination.

Population: Participants with available data through 5 years. Overall number of participants analyzed is based upon the pre-operative population. The Function in Sport and Recreation, Number of Analyzed Participants at 3-years and 5-years is lower than other subscales due to participants not selecting a box on the Likert scale at these timepoints.

The Knee Society Clinical Rating System is comprised of two distinct sub-scores: one for pain, range of motion (ROM) and joint stability (Pain/Motion KSS subscale is 0 to 100, with 100 representing a better outcome), and one for functional parameters (Function KSS subscale is 0 to 100, with 100 representing a better outcome). Sub-scores range from a potential minimum score of 0 to a maximum score of 100 points, and Combined KSS is the summed average of the Pain/Motion and Function sub-scores, leading to a Combined KSS total ranging from 0 to 200 points. Although the specific scores are not distinguished as excellent, good, fair, or poor, a higher value represents a better outcome.

Time frame: Pre-operative, 1, 3, and 5 years. The KSS for 7 and 10 year timepoints are unavailable due to study termination.

Population: Participants with available data through 5 years. Overall number of participants analyzed is based upon the pre-operative population that completed a KSS evaluation. One participant did not have data KSS data available at the preoperative timepoint (n=222).