Correlation of patient-reported numbness around surgical scars with patient-reported outcome measures and joint awareness after knee replacement: a cohort study

Table 6 Results of univariable and multivariable regression analyses with numbness score as the response variable

Variables	Univariable			Multivariable
	regression coefficient	95% CI	P-value	regression coefficient	95% CI	P-value
Age at surgery (years)	0.0049	− 0.01–0.02	0.58	0.001	− 0.02–0.02	0.91
Follow−up (months)	0.004	− 0.001–0.003	0.12
BMI at time of surgery (kg/m²)	−0.04	−0.07 to − 0.04	0.03	−0.03	−0.07–0.004	0.08
Preoperative knee flexion angle (°)	0.004	−0.05–0.01	0.40
Postoperative knee flexion angle (°)	0.009	−0.003–0.02	0.17
Sex (male)	0.2	− 0.16–0.56	0.27	0.21	−0.18–0.59	0.29
Diagnosis			0.06
ON [vs. OA]	0.61	0.07–1.16	0.03
RA [vs. OA]	−0.21	−0.78–0.37	0.48
Preoperative K − L grade			0.14
K − L grade 2 [vs. Grade 1]	0.95	−1.91–3.81	0.51	1.38	−1.47–4.42	0.27
K − L grade 3 [vs. Grade 1]	1.61	−1.20–4.42	0.26	2.12	−0.69–4.93	0.14
K − L grade 4 [vs. Grade 1]	1.64	−1.15–4.44	0.25	2.32	−0.49–5.13	0.11
Surgical method [UKA]	0.3	−0.07–0.66	0.11	0.29	−0.19–0.78	0.23
Incision [Midline]	0.34	0.05–0.62	0.02	0.35	0.003–0.69	0.04
Arthrotomy			0.08
Midvastus [vs. Medial parapatellar]	0.19	−0.23–0.60	0.38
Subvastus [vs. Medial parapatellar]	−0.23	−0.58–0.12	0.20
Trivector [vs. Medial parapatellar]	0.39	−0.41–1.20	0.34

CI Confidence interval, BMI Body mass index, K − L Kellgren−Lawrence, OA Osteoarthritis, ON Osteonecrosis, RA Rheumatoid arthritis, UKA Unicondylar knee arthroplasty
Boldface means statistically significant

ISSN: 1471-2474