Comparison of a Single Assessment Numeric Evaluation Method and the Banff Patella Instability Instrument 2.0 for...

Area of Science:

• Orthopedics
• Clinical Assessment
• Patient-Reported Outcomes

Background:

• The Single Assessment Numeric Evaluation (SANE) is used for various clinical conditions, but a validated SANE for patellofemoral instability is lacking.
• Patellofemoral instability presents complex challenges that may not be captured by a single assessment tool.

Purpose of the Study:

• To evaluate the expressiveness and validity of Single Assessment Numeric Evaluation (SANE) questions for patients with patellofemoral instability.
• To test the hypothesis that a single question cannot fully represent the complexity of patellofemoral instability.

Main Methods:

• A cohort of 120 patients with patellofemoral instability were assessed using the Banff Patella Instability Instrument 2.0 (BPII 2.0).
• Patients were randomized into three groups, each answering one of three SANE questions (SQs) focusing on knee stability, satisfaction, or function.
• Statistical analyses included one-way ANOVA, Pearson correlation, and Bland-Altman analysis to compare SANE questions with the BPII 2.0.

Main Results:

• No significant differences were found in the mean scores among the three SANE questions (SQ 1, SQ 2, SQ 3).
• The SANE question regarding kneecap stability (SQ 1) demonstrated a high correlation with the BPII 2.0 (r = 0.75).
• Other SANE questions showed lower correlations with the BPII 2.0, and Bland-Altman analysis indicated varying degrees of bias.

Conclusions:

• The SANE question, "How do you rate your knee joint if a completely stable kneecap means 100%?", exhibits concurrent validity with the BPII 2.0.
• This specific SANE question can potentially serve as an effective tool for rapid preoperative assessment of patients experiencing recurrent patellofemoral instability.