The Forgotten Joint Score-12 in Swedish patients undergoing knee arthroplasty: a validation study with the Knee Injury and Osteoarthritis Outcome Score (KOOS) as comparator

Figures & data

Table 1. Demographic data, postoperative mean (SD) and median (range) score of the FJS-12 and the KOOS domains

Characteristics	TKA	UKA	All patients
Number of patients (%)	86 (79)	23 (21)	109 (100)
Women, n (%)	51	14	65 (60)
Age at surgery
Mean (SD)	69 (9)	71 (7)	69 (9)
Mean BMI (SD)	30 (5)	28 (3)	30 (7)
ASA classification, n (%)
1	6	3	9 (8)
2	42	11	53 (49)
3	37	9	46 (42)
N/A	1	–	1 (1)
Median score (range)
FJS-12	33 (0–100)	40 (0–100)	35 (0–100)
KOOS Symptoms	75 (25–100)	75 (46–100)	75 (25–100)
KOOS Pain	83 (5–100)	81 (31–100)	83 (6–100)
KOOS ADL	79 (10–100)	78 (36–100)	78 (10–100)
KOOS Sport/Rec	25 (0–100)	40 (0–95)	30 (0–100)
KOOS QoL	53 (0–100)	63 (19–100)	56 (0–100)
Mean score (SD)
FJS-12	37 (30)	50 (33)	40 (31)
KOOS Symptoms	72 (18)	79 (15)	74 (18)
KOOS Pain	76 (23)	79 (20)	77 (22)
KOOS ADL	70 (25)	77 (21)	72 (24)
KOOS Sport/Rec	32 (29)	43 (28)	34 (29)
KOOS QoL	57 (26)	64 (25)	58 (26)

BMI = Body Mass Index;

ASA = American Society of Anesthesiologists;

FJS-12 = Forgotten Joint Score-12;

KOOS = Knee injury and Osteoarthritis Outcome Score;

ADL = Functions in daily life;

Sport/Rec = Functions in sport and recreational activities;

QoL = Knee-related quality of life.

Figure 1. Distribution of scores 1 year after knee arthroplasty in FJS-12 and KOOS domains: Symptoms; Pain; Functions in daily life (ADL); Functions in sport and recreational activities (Sport/Rec), and Knee-related quality of life (QoL).

Table 2. Number (%) of patients with floor effect (0 points), ceiling effect (100 points) out of 109 patients

Questionnaire	Floor effect	Ceiling effect
FJS-12	10 (9)	3 (3)
KOOS Symptoms	0	6 (6)
KOOS Pain	0	11 (10)
KOOS ADL	0	6 (6)
KOOS Sport/Rec	19 (17)	1 (1)
KOOS QoL	1 (1)	6 (6)

For abbreviations, see Table 1.