Large medial meniscus extrusion and varus are poor prognostic factors of arthroscopic partial meniscectomy for degenerative medial meniscus lesions

Table 1 Baseline characteristics of the participants allocated to APM (n = 86)

Variable
Sex, males (N)/females (N)	41/45
Age, y	53.2 ± 7.0
BMI [\(\overline{x} \pm s\)]	23.7 ± 2.4
Follow-up period (mo)	32.1 ± 7.8
HKA (°)	176.8 ± 1.8
MPTS (°)	6.4 ± 2.2
MME (mm)	1.6 ± 0.9
Cartilage status, 0/1/2/3/4 (Outerbridge classification)	20/23/27/16/0
Occupational kneeling, yes/no	8/78

	Preoperation	Postoperation	P value
Lysholm score	63.8 ± 9.3	84.5 ± 9.7	0.000*
Kellgren–Lawrence grade, 0/1/2/3/4	20/36/30/0/0	15/27/25/19/0	0.000^&

Continuous variables are shown as mean ± SD
APM arthroscopic partial meniscectomy, BMI body mass index, HKA hip–knee–ankle, MPTS medial posterior tibial slope, MME medial meniscal extrusion, K–L grade Kellgren–Lawrence grade
^*u-test
^&Fisher exact test

ISSN: 1749-799X