Table 3 Comparison of literature reporting results for DPVNS of the knee

Ohnuma et al. 2003

Anterior and two posterior oblique incisions (2-stage)

5

Mean 6.9 years (3.3-8.1 years)

No

One residual (20%); one recurrence (20%)

Three (60%) full ROM

Not available

One infection

Flandry et al. 1994

Anterior and one posteromedial incisions (2-stage)

23

Mean 58 months

No

One recurrence (11%)

Not available

Not available

Not available

Wu et al. 2007

Anterior and direct posterior incisions (2-stage)

9

Mean 67 months (37-103 months)

Yes

Two recurrence (8%)

Maximal flexion from 90 to 130 degrees.

Three (33.3%) had flexion contracture of 5 degrees develop.

None

Chen et al. 2012

Anterior and direct posterior incisions

19

Median 98 months (42-130 months)

Yes

Five residual (26%); two recurrence (11%)

Mean extension improved from 11 to 2 degrees; flexion from 76 to 127 degrees.

None

None

Current study

1. Anterior and two separate posterior incisions

2. Anterior and direct posterior incisions

20

Median 4.5 years (2-11 years)

14 patients with perioperative radiotherapy (70%)

1. SP group: 3 residual (23.1%) and 2 recurrence (15.4%)

2. DP group: 1 residual (14.3%) and 2 recurrence (28.6%)

1. SP group: mean extension from 1.54 to 2.31 degrees; flexion from 105.77 to 124.62 degrees.

2. DP group: mean extension from 0 to 4.29 degrees; flexion from 93.57 to 105 degrees.

1. SP group: One (7.7%) had flexion contracture of 10 degrees develop.

2. DP group: Three (42.9%) had flexion contracture of 10 degrees develop.

None