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Table 5 Overview of relevant literature

From: Long-term results of total knee arthroplasty with single-radius versus multi-radius posterior-stabilized prostheses

First author

Year

Design

Origin

Minimal follow-up (M)

Participants

Prostheses

Postoperative results

Complication (required revision)

Survival

Conclusion

SR

MR

SR

MR

P value

Molt

2012

PRCT

Sweden

24

25

25

SR: Stryker Triathlon, CR

MR: Stryker Duracon, CR

KSS knee, 61.84 ± 2.62

KSS function, 86.94 ± 6.33

Mean RSA, 0.76 ± 0.18

KSS knee, 63.84 ± 3.67

KSS function, 88.96 ± 6.33

Mean RSA, 0.63 ± 0.26

> 0.05

> 0.05

0.462

N/A

SR, 100%

MR, 100%

SR has similar early stability and same function to MR

Jo

2014

PRCT

South Korea

24

50

50

SR: Stryker Scorpio NRG, CR

MR: Zimmer NexGen, CR

HSS, 90.1 ± 6.2

WOMAC, 21.9 ± 8.2

ROM, 128.7 ± 11.6

Stability stress at 30°, 7.6

HSS, 91.9 ± 7.0

WOMAC, 20.2 ± 12.9

ROM, 126.0 ± 12.7

Stability stress at 30°, 8.3

0.42

0.13

0.26

< 0.01

N/A

SR, 100%

MR, 100%

SR better intra-operative stability at 30° of flexion. Clinical results no differences in two groups

Palmer

2014

RCS

Australia

24

338

674

SR: Stryker Scorpio NRG, CR

MR: Stryker Duracon, CR

KSS knee, 89.5 ± 10.3

KSS function, 71.7 ± 21.5

ROM, 108.5 ± 12.5

No pain, 66.3%

KSS knee, 83.5 ± 14.8

KSS function, 68.7 ± 23.0

ROM, 106.5 ± 13.7

No pain, 54.4%

< 0.05

0.046

0.02

< 0.05

N/A

SR, 100%

MR, 100%

SR better knee flexion, knee score and function score than MR

Hamilton

2015

PRCT

UK

36

90

75

SR: Stryker Triathlon, CR

MR: Stryker Kinemax, CR

OKS (change), 17.1 (− 14 to 33)

ROM, 108.5 ± 9.7

Lower limb power, (94 ± 34)%

Worst daily pain, 1.7 ± 1.5

Average pain, 0.5 ± 1.2

OKS (change), 20.1(−3 to 39)

ROM, 99.8 ± 9.7

Lower limb power, (116 ± 40)%

Worst daily pain, 2.5 ± 2.2

Average pain, 0.9 ± 1.4

0.05

< 0.05

< 0.05

< 0.05

0.57

SR: 1 early infection

MR: 2 early infection, 1 revised

N/A

SR better function (lower limb power and knee flexion), pain levels, and overall satisfaction

Oliviu

2016

RCS

Romania

32

94

70

SR: Stryker NRG, PS

MR: Zimmer NexGen, PS

KSS knee, 87.2 ± 7.5

KSS function, 86.2 ± 7.1

KSS knee, 86.8 ± 11.3

KSS function, 81.5 ± 13.7

> 0.05

> 0.05

SR: 1 apparent and 1 impending mechanical failure

MR: 1 impending mechanical failure

SR, 95.8% (95% CI 91.8–99.8%)

MR, 92.7% (95% CI 87.7–97.7%)

(at 60 months, P = 0.31)

No differences in two groups.

Isabel

2017

PRCT

Spain

60

118

119

SR: Italy Samo, CR

MR: Italy Lima, CR

KSS knee, 83.9 ± 6.6

KSS function, 84.2 ± 8.5

ROM, 105.2 ± 10.0

Quadriceps strength, 3.0 ± 1.2

Chair test, 103/15

KSS knee, 83.9 ± 6.6

KSS function, 84.2 ± 8.5

ROM, 99.4 ± 8.1

Quadriceps strength, 2.6 ± 0.9

Chair test, 92/27

0.001

0.001

0.001

0.004

0.032

SR: 1 deep wound infection, 2 aseptic tibial loosening

MR: 1 deep wound infection, 2 aseptic tibial loosening; 1 periprosthetic femoral fracture

SR, 97.4% (95% CI 92.4–100%)

MR, 97.4% (95% CI 94.6–100%)

(at 60 months, P > 0.05)

SR shows better results than MR. The use of SR system is recommended

This study

2018

RCS

China

120

106

114

SR: Stryker NRG, PS

MR: Sigma PFC, PS

HSS, 86.32 ± 10.22

KSS knee, 84.52 ± 18.50

KSS function, 86.23 ± 17.50

WOMAC, 21.83 ± 15.60

ROM, 115.65 ± 10.32°

Anterior knee pain, 9 (10.38%)

Chair test, 88 (83.02%)

HSS, 84.52 ± 10.53

KSS knee, 85.63 ± 16.82

KSS function, 85.14 ± 16.20

WOMAC, 23.24 ± 15.80

ROM, 115.50 ± 10.13°

Anterior knee pain, 20 (17.54%)

Chair test, 93 (81.58%)

0.200

0.570

0.614

0.632

0.501

0.025

0.780

SR: 1 periprosthetic fracture, 3 prosthesis loosening;

MR: 2 periprosthetic fracture, 3 prosthesis loosening

SR, 94.4% (95% CI 90.4–98.4%)

MR, 93.4% (95% CI 89.4–97.4%)

(at 120 months, P = 0.7519)

SR less anterior knee pain than MR. Clinical, radiological, and survival results no differences in two groups.

  1. PRCT prospective randomized controlled trial, RCS retrospective cohort study, HSS Hospital for Special Surgery scores, KSS Knee Society score, WOMAC The Western Ontario and McMaster Universities score, OKS Oxford knee score, ROM range of motion < 0.05 indicates significant differences