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

Table 7 Results of univariable and multivariable regression analyses with KSS − kneeling as the response variable

Variables	Univariable			Multivariable
Variables	Regression coefficient	95% CI	P-value	Regression coefficient	95% CI	P-value
Age at surgery (years)	−0.009	−0.03–0.01	0.40	−0.02	−0.04–0.02	0.50
Follow-up (months)	−0.008	−0.01 to − 0.002	0.01	−0.0008	−0.01–0.009	0.87
BMI at time of surgery (kg/m²)	−0.007	−0.05–0.03	0.71	−0.006	−0.05–0.03	0.75
Preoperative knee flexion angle (°)	0.002	−0.009–0.01	0.78
Postoperative knee flexion angle (°)	0.02	0.008–0.04	0.002	0.01	0.0004–0.03	0.04
Sex [male]	0.92	0.51–1.33	< 0.0001	0.94	0.53–1.34	< 0.0001
Diagnosis			0.27
ON [vs. OA]	0.21	−0.43–0.86	0.51
RA [vs. OA]	0.52	−0.15–1.20	0.13
Preoperative K–L grade			0.80
K–L grade 2 [vs. Grade 1]	−1.47	−4.86–1.91	0.39
K–L grade 3 [vs. Grade 1]	−1.19	−4.51–2.14	0.48
K–L grade 4 [vs. Grade 1]	−1.21	−4.51–2.10	0.47
Surgical method [UKA]	0.42	−0.008–0.85	0.05	0.38	−0.23–0.99	0.22
Incision [Midline]	−0.20	−0.53–0.14	0.25	−0.44	−0.96–0.07	0.09
Arthrotomy			0.48
Midvastus [vs. Medial parapatellar]	0.26	−0.23–0.74	0.30
Subvastus [vs. Medial parapatellar]	0.33	−0.08–0.74	0.11
Trivector [vs. Medial parapatellar]	0.25	−0.70–1.20	0.61
Numbness score	0.22	0.11–0.33	0.0002	0.19	0.07–0.30	0.001

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

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