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Table 2 Patients’ comorbidities

From: Complex ruptures of the quadriceps tendon: a systematic review of surgical procedures and outcomes

Nr. of reference No. of patients Gender Mean age Comorbidities
[37] Extensor mechanism reconstruction with use of Marlex Mesh. (2019) Abdel et al. 27 10 M 17 F 70 Obesity, diabetes, coronary artery diease, hypertension, OA, rheumatoid arthritis, Parkinson, cancer (leukemia, breast cancer, bladder cancer)
[25] Bilateral quadriceps tendon rupture in a seasoned marathon runner with patellar spurs. (2011) Assiotis et al. 1 M 63 None
[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 None
[48] Quadriceps tendon rupture after total knee arthroplasty. Prevalence, complications, and outcomes. (2005) Dobbs et al. 7 1 M 6 F 69 Obesity [1], steroid abuse [1], DM [1]
[32] Allograft reconstruction of a chronic quadriceps tendon rupture with use of a novel technique. (2014) Forslund et al. 1 M 47 Hypertension
[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 Chronic renal failure, tertiary hyperparathyroidism
[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 CKD with hemodialysis dependence for 5 years
[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 End-stage CKD
[36] Surgical treatment of neglected traumatic quadriceps tendon rupture with knee ankylosis. (2016) Lee et al. 1 M 15 Open fracture of the left femur shaft, intra-articular fracture of the proximal tibia
[17] Reconstruction of a chronic quadriceps tendon tear in a body builder. (2006) Leopardi et al. 1 M 28 Anabolic steroid use
[33] Reconstruction of disrupted extensor mechanism after total knee arthroplasty. (2017) Lim et al. 3 2 M 1 F 69 GERD, pulmonary embolism, diabetes, hypothyroidism, asthma, hypertension, stroke, smoke
[42] Neglected ipsilateral simultaneous ruptures of patellar and quadriceps tendon (2015) Karahasanoglu et al. 1 M 40 Ipsilateral patellar tendon rupture
[43] Bilateral quadriceps tendon rupture and coexistent femoral neck fracture in a patient with chronic renal failure. (2007) Kazimoglu et al. 1 F 37 CKD, with hemodialysis dependence for 2 years
[28] Autologous hamstring tendon used for revision of quadiceps tendon tears. (2013) McCormick et al. 1 Male 38 None
[38] Polypropylene mesh augmentation for complete quadriceps rupture after total knee arthroplasty. (2016) Nodzo et al. 7 2 M 5 F 56 Diabetes, rheumathoid arhtritis, chronic pulmonary disease with steroid use, HCV, drug abuse, smoke, chronic renal failure
[44] Chronic quadriceps tendon rupture after total knee arthroplasty augmented with synthetic mesh. (2017) Ormaza et al. 3 2 M 1 F 70 Hemochromatosis
[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 Tricompartmental knee osteoarthritis
[45] Delayed reconstruction of a quadriceps tendon. (2008) Pocock et al. 1 F 80 Hypertension
[30] Chronic rupture of the extensor apparatus of the knee joint. (2005) Poonnoose et al. 1 M 50 Comminuted patellar fracture treated with patellectomy
[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 Hypertension, glaucoma
[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 50 Hypertension, Hypercolesterolaemia, Obesity, and chronic back pain
[18] Repair of ruptured quadriceps tendon with Leeds-Keio ligament following revision knee surgery. (2008) Rust et al. 1 F 86 None
[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 13F 61 Obesity, diabetes, chronic dialysis, steroid dependence (12pt)
[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 Chronic renal failure, with hemodialysis dependence for 9 and 11 years
[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 69 Hypertension [3], GERD, obesity [3], hypothyroidism, asthma, chronic kidney disease, OA, diabetes [3]