Table 2

Descriptive data of study population (n = 105)

Mean ± SD

n (%)


Demographics

Age (years)

61.4 ± 6.9

Gender (female)

73 (70)

Duration of knee complaints (years)

11.3 ± 9.3

Body mass index (kg/m2)

29.1 ± 4.7

Radiographic severitya

K-L score 0/1

32 (31)

K-L score 2

28 (27)

K-L score 3

26 (25)

K-L score 4

19 (18)

Pain severity (NRS, 0 to 10)

5.1 ± 2.1

Biomechanical factors

Quadriceps muscle strength (Nm/kg)a

0.89 ± 0.47

Hamstrings muscle strength (Nm/kg)a

0.61 ± 0.26

Proprioceptive accuracy (degrees)a

2.9 ± 1.9

Varus-valgus laxity (degrees)a

6.9 ± 2.8

Physical examination findings

Bony tenderness (yes)a

75 (71)

Crepitus (yes)a

86 (82)

Bony enlargement (yes)a

12 (11)

Palpable warmth (yes)a

4 (4)

Tissue abnormalities, detected by CR

Median (range)

n

Joint space widtha

MTF (0, 1, 2, 3)b

5, 29, 31, 40

LTF (0, 1, 2, 3)b

68, 20, 10, 7

PF (0, 1, 2, 3)b

31, 44, 22, 8

Osteophytesa

MTF (0, 1, 2, 3)c

21, 57, 24, 3

LTF (0, 1, 2, 3)c

43, 49, 11, 2

PF (0, 1, 2, 3)c

11, 67, 25, 2

Tissue abnormalities, detected by MRI

Cartilage integritya

MTF (0 to 6)

4 (0 to 6)

LTF (0 to 6)

2 (0 to 6)

PF (0 to 12)

2 (0 to 12)

Osteophytesa

MTF (0 to 9)

3 (0 to 9)

LTF (0 to 9)

2 (0 to 9)

PF (0 to 18)

5 (0 to 12)

Bone marrow lesionsa

MTF (0 to 6)

1 (0 to 6)

LTF (0 to 6)

0 (0 to 6)

PF (0 to 12)

0 (0 to 8)

Effusion (0, 1, 2, 3)a,d

34, 31, 27, 13

Synovitisa presence, n (%)

In at least one region

36 (34)

In Hoffa's fat pad

31 (30)

In medial posterior-condylar region

13 (12)

In lateral posterior-condylar region

12 (11)

In medial recess

6 (6)

In lateral recess

7 (7)


CR, conventional radiography; K-L, Kellgren-Lawrence; LTF, lateral tibiofemoral compartment; MRI, magnetic resonance imaging; MTF, medial tibiofemoral compartment; NRS: numeric rating scale; PF, patellafemoral compartment; SD, standard deviation. aData from index knee. b0 = none, 1 = minute narrowing (0 to 33%); 2 = definite narrowing (33 to 66%); 3 = ankylosis (66 to 99%). c0 = none, 1 = minute, 2 = definite, 3 = large. d0 = none, 1 = mild; 2 = moderate; 3 = severe.

Knoop et al. Arthritis Research & Therapy 2012 14:R212   doi:10.1186/ar4050

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