Patient-matched instruments versus standard instrumentation in total knee arthroplasty: a prospective randomized study

Wiener klinische Wochenschrift
Andrej MolicnikDrago Dolinar

Abstract

Optimal positioning of implants and restoration of neutral mechanical axis are two primary surgical goals in total knee arthroplasty (TKA). Despite modern instruments and improved surgical techniques, malalignment remains an important cause of early failure after TKA. The aim of this prospective randomized study was to compare the value of a new patient-matched instrument system (PMI) (Signature(TM); Biomet, Inc, Warsaw, Indiana) to that of standard TKA surgical instrumentation (STD) in terms of coronal mechanical alignment, time of operation and blood loss. A total of 38 patients waiting for primary TKA were enrolled and randomized into two groups (19 PMI and 19 STD). Magnetic resonance imaging was performed in all patients in the PMI group, and specific instruments for the femur and tibia were designed preoperatively. All patients were operated on using the standard medial parapatellar approach with no use of tourniquet. Mechanical axis, time for the operation, and blood loss were evaluated. Patients in both groups had comparable age, body mass index, preoperative mechanical axis, Knee Society Score, and level of hemoglobin. Postoperative results showed that the PMI group fell significantly closer to neutral mechanical axis (...Continue Reading

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Citations

Nov 1, 2018·Revista Brasileira De Ortopedia·João Bosco Sales NogueiraJosé Alberto Dias Leite
Jun 19, 2018·Revista Brasileira De Ortopedia·João Bosco Sales NogueiraMarco Kawamura Demange
Nov 1, 2018·Knee Surgery, Sports Traumatology, Arthroscopy : Official Journal of the ESSKA·Song GongGuo Chen
Jun 4, 2019·Expert Review of Medical Devices·Vicente J León-MuñozFernando Santonja-Medina
Jul 13, 2017·Knee Surgery, Sports Traumatology, Arthroscopy : Official Journal of the ESSKA·Martijn G M SchotanusNanne P Kort
Aug 23, 2019·Knee Surgery, Sports Traumatology, Arthroscopy : Official Journal of the ESSKA·Zhihao LiZongquan Feng
Mar 16, 2017·The Journal of Bone and Joint Surgery. American Volume·Emmanuel ThienpontPeter Fennema

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