Knee arthroplasty: are patients' expectations fulfilled?

Figures & data

Table 1. Patient characteristics and outcome

Patient characteristics	Preop. n = 102/102	6 months n = 94/102	12 months n = 87/94	5 years n = 80/93
Age mean (SD)	71 (8.0)	71 (8.2)	72 (8.0)	76 (7.9)
[range]	[51–86]			[59–90]
No. of men (%)	39 (38)	38 (40)	37 (42)	33 (41)
No. of women (%)	63 (62)	56 (60)	50 (58)	47 (59)
BMI (SD)				28.4 (3.6)
[range]				[17–39]
KOOS pain	38 (18)	79 (20)	84 (17)	79 (21)
KOOS ADL	41 (16)	78 (17)	82 (16)	73 (21)
KOOS sport/recreation	17 (22)	48 (33)	47 (30)	52 (28)
SF-36 BP^a	30 (18)	69 (25)	72 (23)	63 (25)
SF-36 PF^b	27 (15)	58 (21)	61 (21)	51 (24)

^a bodily pain;

^b physical function.

Figure 1. Breakdown of patients’ (n = 80) expectations preoperatively, the situation preoperatively, and outcome concerning walking ability. Crutches: the need for crutches or some other device to move more than a few steps; indoors: able to walk indoors; < 1 km: able to walk indoors and less than 1 km outdoors; > 1 km: able to walk more than 1 km; unlimited: unlimited walking on even ground; uneven terrain: unlimited walking on uneven terrain.

Figure 2. Breakdown of patients’ (n = 80) expectations preoperatively, the situation preoperatively, and outcome concerning leisure activities. No: no household work, only TV and reading; minimal: minimal household work, card games, and sewing; light: light yard work, light household work, shopping; heavy: heavy yard work, heavy household work; golf, dance: golf, dancing, hiking, water aerobics; recr sports: recreational sports.

Figure 3. Percentages of patients (n = 80) with high expectations (much less or less pain; better or much better ADL, better or much better sport/recr) preoperatively and the percentages of patients reporting fulfilled expectations at 3 different follow-up times. ADL: activities of daily living; sport/recr: sport and recreational function; exp: expectations.

Figure 4. Percentage of patients who reported satisfaction (extremely satisfied, very satisfied) at the follow-ups 6 months, 12 months, and 5 years after TKR. The first (left-hand) block shows general satisfaction and the others show specific satisfaction in relation to the 5 KOOS subscales.

Table 2. Correlation between preoperative variables and postoperative satisfaction

Satisfaction	KOOS pain	KOOS ADL	SF-36 PF	SF-36 BP	SF-36 GH	Age	BMI	Co-morbidity
Pain relief	0.26^a	0.24^a	0.06	0.18	0.27^a	0.18	–0.13	–0.13
Relief of symptoms	0.35^a	0.25^a	0.03	0.23^a	0.29^a	0.15	–0.14	–0.12
Improvement in ADL	0.37^a	0.35^a	0.21	0.29^a	0.37^a	0.16	–0.11	–0.15
Sport/recreational improvement	0.24^a	0.22	0.10	0.16	0.23	0.20	–0.30	–0.10
Knee-related QL improvement	0.29^a	0.14	0.11	0.16	–0.31^a	0.19	–0.03	–0.13

ADL – activity of daily living, PF – physical function, BP – bodily pain, GH – general health

Spearman’s rank correlation test. Results are given as r_s.^a p < 0.05.

Table 3. Percentage of patients at the 5-year follow-up who suffered from musculoskeletal pain. 6 patients were operated bilaterally (data not shown)

Musculoskeletal co-morbidity
Low back pain	35%
Arthritis-related pain	28%
Hip pain (left hip)	16%
Hip pain (right hip)	20%
Knee pain, operated knee	9%
Knee pain, unoperated knee	21%
Knee pain bilaterally	14%
No knee pain	56%