Females, younger patients and patients with high BMI have the highest pre-operative knee awareness measured using the Forgotten Joint Score

TY - JOUR

T1 - Females, younger patients and patients with high BMI have the highest pre-operative knee awareness measured using the Forgotten Joint Score

AU - Li, Dana

AU - Troelsen, A.

AU - Ingelsrud, L.

AU - Husted, H.

AU - Gromov, K.

PY - 2018/9/1

Y1 - 2018/9/1

N2 - Purpose: The Forgotten Joint Score (FJS) is a novel measurement for patients’ awareness of their knee in daily life. By identifying factors that could explain pre-operative FJS levels, the clinician could better prioritize and single out patients who would benefit most from TKA. The aim of this study was to identify possible factors that may explain the variance of pre-operative FJS levels and evaluate the relationship between pre-operative FJS and pre-operative Oxford Knee Score (OKS). Methods: Four-hundred and six individual knees undergoing primary TKA between 2014 and 2016 were included in the study. Age, gender, body mass index (BMI), pre-operative FJS and pre-operative OKS were obtained maximum 2 weeks prior to surgery. Kellgren–Lawrence (K–L) grade, alignment and joint space width (JSW) were evaluated on pre-operative radiographs. Results: Mean FJS was 21.1 ± 15.6. Females, younger patients and patients with high BMI had significantly the worst pre-operative FJS (p < 0.005). Females scored 6.5 FJS points lower than males. A 0.2-point increase in FJS for every added year indicated improvement in knee awareness with age. A 0.4-point decrease in FJS points for every added BMI point indicated worse knee awareness with higher BMI. There was a strong positive correlation between pre-operative FJS and pre-operative OKS according to the Spearman’s rank order test (p < 0.005). Conclusions: Females, younger patients and patients with high BMI had significantly the worst pre-operative joint awareness. FJS had a strong positive correlation to OKS in pre-operative patients for primary TKA. This information can be used for improved patient selection; clinically continuous low FJS despite weight loss and/or the passing of time may be indication for TKA. Level of evidence: Prospective cohort study, Level II.

AB - Purpose: The Forgotten Joint Score (FJS) is a novel measurement for patients’ awareness of their knee in daily life. By identifying factors that could explain pre-operative FJS levels, the clinician could better prioritize and single out patients who would benefit most from TKA. The aim of this study was to identify possible factors that may explain the variance of pre-operative FJS levels and evaluate the relationship between pre-operative FJS and pre-operative Oxford Knee Score (OKS). Methods: Four-hundred and six individual knees undergoing primary TKA between 2014 and 2016 were included in the study. Age, gender, body mass index (BMI), pre-operative FJS and pre-operative OKS were obtained maximum 2 weeks prior to surgery. Kellgren–Lawrence (K–L) grade, alignment and joint space width (JSW) were evaluated on pre-operative radiographs. Results: Mean FJS was 21.1 ± 15.6. Females, younger patients and patients with high BMI had significantly the worst pre-operative FJS (p < 0.005). Females scored 6.5 FJS points lower than males. A 0.2-point increase in FJS for every added year indicated improvement in knee awareness with age. A 0.4-point decrease in FJS points for every added BMI point indicated worse knee awareness with higher BMI. There was a strong positive correlation between pre-operative FJS and pre-operative OKS according to the Spearman’s rank order test (p < 0.005). Conclusions: Females, younger patients and patients with high BMI had significantly the worst pre-operative joint awareness. FJS had a strong positive correlation to OKS in pre-operative patients for primary TKA. This information can be used for improved patient selection; clinically continuous low FJS despite weight loss and/or the passing of time may be indication for TKA. Level of evidence: Prospective cohort study, Level II.

U2 - 10.1007/s00167-017-4446-5

DO - 10.1007/s00167-017-4446-5

M3 - Journal article

C2 - 28210786

SN - 0942-2056

VL - 26

SP - 2587

EP - 2593

JO - Knee Surgery, Sports Traumatology, Arthroscopy

JF - Knee Surgery, Sports Traumatology, Arthroscopy

IS - 9

ER -