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The use of rapid prototyped implants to simulate knee joint abnormalities for in vitro testing: a validation study with replica implants of the native trochlea

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Abstract
To investigate the biomechanical effect of skeletal knee joint abnormalities, the authors propose to implant pathologically shaped rapid prototyped implants in cadaver knee specimens. This new method was validated by replacing the native trochlea by a replica implant on four cadaver knees with the aid of cadaver-specific guiding instruments. The accuracy of the guiding instruments was assessed by measuring the rotational errors of the cutting planes (on average 3.01 degrees in extension and 1.18 degrees in external/internal rotation). During a squat and open chain simulation, the patella showed small differences in its articulation with the native trochlea and the replica trochlea, which could partially be explained by the rotational errors of the implants. This study concludes that this method is valid to investigate the effect of knee joint abnormalities with a replica implant as a control condition to account for the influence of material properties and rotational errors of the implant.
Keywords
ARTHROPLASTY, STABILITY, ROTATIONAL ALIGNMENT, PATELLO-FEMORAL JOINT, trochlear dysplasia, patellofemoral pressures, patellofemoral kinematics, knee biomechanics, rapid prototyping, In vitro experiment, ACCURACY, REPLACEMENT, MODEL

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Chicago
Van Haver, Annemieke, Karel De Roo, Matthieu De Beule, Sofie Van Cauter, Luc Labey, PATRICK DE BAETS, Tom Claessens, and Peter Verdonk. 2014. “The Use of Rapid Prototyped Implants to Simulate Knee Joint Abnormalities for in Vitro Testing: a Validation Study with Replica Implants of the Native Trochlea.” Proceedings of the Institution of Mechanical Engineers Part H-journal of Engineering in Medicine 228 (8): 833–842.
APA
Van Haver, A., De Roo, K., De Beule, M., Van Cauter, S., Labey, L., DE BAETS, P., Claessens, T., et al. (2014). The use of rapid prototyped implants to simulate knee joint abnormalities for in vitro testing: a validation study with replica implants of the native trochlea. PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART H-JOURNAL OF ENGINEERING IN MEDICINE, 228(8), 833–842.
Vancouver
1.
Van Haver A, De Roo K, De Beule M, Van Cauter S, Labey L, DE BAETS P, et al. The use of rapid prototyped implants to simulate knee joint abnormalities for in vitro testing: a validation study with replica implants of the native trochlea. PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART H-JOURNAL OF ENGINEERING IN MEDICINE. 2014;228(8):833–42.
MLA
Van Haver, Annemieke, Karel De Roo, Matthieu De Beule, et al. “The Use of Rapid Prototyped Implants to Simulate Knee Joint Abnormalities for in Vitro Testing: a Validation Study with Replica Implants of the Native Trochlea.” PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART H-JOURNAL OF ENGINEERING IN MEDICINE 228.8 (2014): 833–842. Print.
@article{5991397,
  abstract     = {To investigate the biomechanical effect of skeletal knee joint abnormalities, the authors propose to implant pathologically shaped rapid prototyped implants in cadaver knee specimens. This new method was validated by replacing the native trochlea by a replica implant on four cadaver knees with the aid of cadaver-specific guiding instruments. The accuracy of the guiding instruments was assessed by measuring the rotational errors of the cutting planes (on average 3.01 degrees in extension and 1.18 degrees in external/internal rotation). During a squat and open chain simulation, the patella showed small differences in its articulation with the native trochlea and the replica trochlea, which could partially be explained by the rotational errors of the implants. This study concludes that this method is valid to investigate the effect of knee joint abnormalities with a replica implant as a control condition to account for the influence of material properties and rotational errors of the implant.},
  author       = {Van Haver, Annemieke and De Roo, Karel and De Beule, Matthieu and Van Cauter, Sofie and Labey, Luc and De Baets, Patrick and Claessens, Tom and Verdonk, Peter},
  issn         = {0954-4119},
  journal      = {PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART H-JOURNAL OF ENGINEERING IN MEDICINE},
  language     = {eng},
  number       = {8},
  pages        = {833--842},
  title        = {The use of rapid prototyped implants to simulate knee joint abnormalities for in vitro testing: a validation study with replica implants of the native trochlea},
  url          = {http://dx.doi.org/10.1177/0954411914548242},
  volume       = {228},
  year         = {2014},
}

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