Table 1

Patient characteristics

VariableNArthroscopic partial meniscectomyNSkin incisions onlyNTotalMinMax
Mean (SD)Mean (SD)Mean (SD)
Person demographics
 Age, years2247.2 (5.9)2246.4 (5.5)4446.8 (5.7)37.555.8
 Females, n (%)229 (41)2212 (55)4421 (48)
 Height, cm22176 (9)22174 (12)44175 (11)156194
 Weight, kg2285.6 (14.6)2279.7 (19.5)4482.6 (17.3)52120
 BMI, kg/m2 2227.6 (3.6)2226 (3.9)4426.8 (3.8)18.633.5
Knee examinations
 Kellgren and Lawrence grade (0 – 4)222244
  0, n (%)9 (41)10 (45)19 (43)
  1, n (%)9 (41)8 (36)17 (39)
  2, n (%)4 (18)4 (18)8 (18)
  3, n (%)0 (0)0 (0)0 (0)
  4, n (%)0 (0)0 (0)0 (0)
 Joint line tenderness, n (%)2121 (100)2220 (91)4341 (95)
 Positive results of McMurray test, n (%)2117 (81)2217 (77)4334 (79)
 Swelling present, n (%)2111 (52)228 (36)4319 (44)
 Knee extension212243
  Full extension, n (%)18 (86)21 (95)39 (91)
  Small extension deficit <10°, n (%)3 (14)1 (5)4 (9)
 Knee flexion212243
 Full flexion, n (%)17 (81)14 (64)31 (72)
 Small flexion deficit <10°, n (%)3 (14)6 (27)9 (21)
 Large flexion deficit, n (%)1 (5)2 (9)3 (7)
Findings during arthroscopy
 Meniscus operated on (medial/lateral/both), n (%)21(20/0/1) (95/0/50)
 Meniscus resection
  Extent of resection (1–3 regions), median (range)1 (1– 3)
  Anterior region, n (%)1 (5)
  Mid region, n (%)1 (5)
  Posterior region, n (%)19 (90)
 Cartilage status: (worst ICRS grade, 0-IVb)
  Tibia, median (range)0 (0– IIIb)
  Femur, median (range)0.5 (0– IIIa)
  Patella, median (range)0 (0– II)
Patient-reported data
 Duration of pain, months, median (IQR)225.0 (2.0 – 6.0)223.5 (2.0 – 6.0)444.0 (2.0 – 6.0)260
KOOS
 KOOS(0–100)2251.2 (15.6)2044.8 (19.9)4248.1 (17.8)2188
 Pain (0–100)2255.1 (15.4)2045.9 (22)4250.7 (19.2)1186
 Symptoms (0–100)2262.8 (17.7)2059.9 (20.6)4261.4 (18.9)32100
 Function in daily living (0–100)2264.9 (19.9)2056.5 (22.3)4260.9 (21.3)25100
 Function in sport and recreation (0–100)2235 (23)2025.2 (26.3)4230.4 (24.9)085
 Knee-related quality of life (0–100)2238.7 (15.4)2036.6 (20.2)4237.7 (17.6)675
EQ-5D
 VAS score2169 (14)20634166 (19)2595
 EQ-5D-3L index value (0–1)210.749 (0.108)200.642410.697 (0.148)0.2931.000
SF-36
 Physical component summary (0–100)2138 (10)20354137 (9)1755
 Mental component summary (0–100)2159 (7)20574158 (7)4370
Performance and muscle function
 One leg hop test (affected knee), cm2154 (33)20524153 (33)0130
 One leg hop test (non-affected knee), cm2164 (30)20644164 (30)4126
 One leg hop LSI*, %848183
 Knee bending test, max number of knee bends (affected knee), n2118 (8)20154117 (8)433
 Knee bending test, max number of knee bends (non-affected knee), n2121 (7)20194120 (7)833
 Knee bendings LSI*, %867985
 Isometric knee extensor strength (affected knee), Nm/kg210.96 (0.59)200.78410.87 (0.55)0.002.06
 Isometric knee extensor strength (non-affected knee), Nm/kg211.11 (0.49)200.99411.05 (0.47)0.332.06
 Isometric knee extensor strength LSI*, %867983
  • Data are presented as mean and SD unless otherwise stated.

  • *LSI is calculated as 100 (unaffected leg–affected leg).

  • BMI,  body mass index; ICRS,International Cartilage Repair Society; KOOS, Knee injury and Osteoarthritis Outcome Score; LSI, Limb Symmetry Index; SF-36, Short-Form 36 items; VAS, Visual Analogue Scale.