Table 6 Surgical technique used in QTR treatment

[40] Simultaneous chronic rupture of quadriceps tendon and contra-lateral patellar tendon in a patient affected by tertiary hyperparatiroidism. (2008) Grecomoro et al.

1

M

48

40 days

Fig. 2 and Fig. 3

[41] Neglected rupture of the quadriceps tendon in a patient with chronic renal failure (case report and review of the literature). (2014) Hassani et al.

1

M

32

60 days

[46] Chronic quadriceps rupture: treatment with lengthening and early mobilization without cerclage augmentation and a report of three cases. (2008) Rizio et al.

3

1 M 2 F

46,75

240 days

[23] Modified V-Y turndown flap augmentation for quadriceps tendon rupture following total knee arthroplasty: a retrospective study. (2019) Shi et al.

23

10 M 13 F

61

21 days

Medial gastrocnemius-soleus-calcaneus rotational flap

[29] The hemisoleus rotational flap provides a novel superior autograft reconstructive option for the treatment of chronic extensor mechanism disruption. (2016) Auregan et al.

1

F

80

210 days

Fig. 4

Peroneus longus

[42] Neglected ipsilateral simultaneous ruptures of patellar and quadriceps tendon (2015) Karahasanoglu et al.

1

M

40

730 days

Fig. 5

Gracilis and semitendinosus

[17] Reconstruction of a chronic quadriceps tendon tear in a body builder. (2006) Leopardi et al.

1

M

28

210 days

Gracilis and semitendinosus with prolene mesh reinforcement

[28] Autologous hamstring tendon used for revision of quadiceps tendon tears. (2013) McCormick et al.

1

M

38

1°: immediatly 2°: 300 days after the rerupture

Fig. 6

[19] Quadriceps tendon repair using hamstring, prolene mesh and autologous conditioned plasma augmentation. A novel technique for repair of chronic quadriceps tendon rupture. (2015) Rehman et al.

1

M

61

300 days

Ileo-tibial band

[30] Chronic rupture of the extensor apparatus of the knee joint. (2005) Poonnoose et al.

1

M

50

4380 days

Achilles tendon-bone block

[32] Allograft reconstruction of a chronic quadriceps tendon rupture with use of a novel technique. (2014) Forslund et al.

1

M

47

365 days

[33] Reconstruction of disrupted extensor mechanism after total knee arthroplasty. (2017) Lim et al.

3

2 M 1 F

59

205 days

[34] Long-term results of extensor mechanism reconstruction using Achilles tendon allograft after total knee arthroplasty. (2018) Wise et al.

6

3 M 3 F

68

Full extensor mechanism

[22] Bilateral extensor mechanism allograft reconstruction for chronic spontaneous rupture: a case report and review of the literature. (2019) Lamberti et al.

1

F

51

480 days

[35] Knee osteoarthritis with chronic quadriceps tendon rupture treated with total knee arthroplasty and extensor mechanism allograft reconstruction: a case report. (2018) Piatek et al.

1

M

51

90 days

Fig. 7

Tibialis anterior

[36] Surgical treatment of neglected traumatic quadriceps tendon rupture with knee ankylosis. (2016) Lee et al.

1

M

15

270 days

[37] Extensor mechanism reconstruction with use of Marlex Mesh. (2019) Abdel et al.

27

10 M 17 F

67

219 days

Fig. 8

[38] Polypropylene mesh augmentation for complete quadriceps rupture after total knee arthroplasty. (2016) Nodzo et al.

7

2 M 5 F

58,7

90 days

[18] Repair of ruptured quadriceps tendon with Leeds-Keio ligament following revision knee surgery. (2008) Rust et al.

1

F

86

120 days

[25] Bilateral quadriceps tendon rupture in a seasoned marathon runner with patellar spurs. (2011) Assiotis et al.

1

M

63

42 days

[43] Bilateral quadriceps tendon rupture and coexistent femoral neck fracture in a patient with chronic renal failure. (2007) Kazimoglu et al.

1

F

37

60 days

[44] Chronic quadriceps tendon rupture after total knee arthroplasty augmented with synthetic mesh. (2017) Ormaza et al.

3

2 M 1 F

67,5

148 days

[45] Delayed reconstruction of a quadriceps tendon. (2008) Pocock et al.

1

F

80

2920 days

[47] A simultaneous bilateral quadriceps and patellar tendons rupture in patients with chronic kidney disease undergoing long-term hemodialysis: a case report. (2020) Tao et al.

2

M

33,5

[48] Quadriceps tendon rupture after total knee arthroplasty. Prevalence, complications, and outcomes. (2005) Dobbs et al.

7

1 M 6 F

72

40 days