The role of preoperative templating in total knee arthroplasty: Comparison of three prostheses

Howcroft, D.W.J.; Fehily, Max; Peck, C. N.; A, Fox; Dillon, B.; Johnson, David S.

doi:10.1016/j.knee.2006.05.002

Cited by 29 publications

(35 citation statements)

References 8 publications

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“…An intra-operative variable that is recognised to impact on the load pattern as well as the tribological performance of the prosthesis is the sizing [24]. Due to the complex morphometric relationship of the knee, loss of conformity and abnormal loading can originate from a size mismatch [11,12].…”

Section: Discussionmentioning

confidence: 99%

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Toward the interpretation of the combined effect of size and body weight on the tribological performance of total knee prostheses

Battaglia

Taddei

Tozzi

et al. 2014

International Orthopaedics (SICOT)

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Purpose The research questions of the present study were: (1) Is total knee prosthesis wear behaviour influenced by implant size, body weight and their combined effect? (2) Are these findings significant and helpful from a clinical point of view? Methods Two very different sizes of the same total knee prosthesis (TKP), previously tested with ISO 14243 parameters, were tested on a knee simulator for a further two million cycles using a modified ISO 14243 load waveform. Roughness examination was performed on the metallic components. Gravimetric and micro-Raman spectroscopic analyses were carried out on the polyethylene inserts. Results The average volumetric mass loss was 69 ± 3 mm 3 and 88 ± 4 mm 3 for smaller and bigger size, respectively. Bigger TKPs are little influenced by an increased load, while the wear trend of the smaller TKP showed a redoubled slope, and more significant morphology changes were observed. However, the two sizes seem to behave similarly when subjected to a load increase of 15 %; the slope of the volumetric mass loss trend was comparable for the two sets of inserts, which did not appear significantly different also at the molecular level. Roughness average parameters of the lateral femoral condyle support this evidence. Conclusions It can be asserted that the body weight and implant size are relevant to the understanding of TKP wear behaviour. A post-implantation body weight increase in a patient with smaller knee dimensions could results in more critical effects on prosthesis long-term performance.

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Section: Discussionmentioning

confidence: 99%

“…A proper choice of the prosthesis design and size is of paramount importance for TKR success [11]. Nowadays several TKP designs, shapes and sizes have been conceived, in order to fit most patient anatomies and with the final aim to lessen implant wear [6,12].…”

Section: Introductionmentioning

confidence: 99%

Toward the interpretation of the combined effect of size and body weight on the tribological performance of total knee prostheses

Battaglia

Taddei

Tozzi

et al. 2014

International Orthopaedics (SICOT)

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“…Total knee prostheses (TKP) are commercially available in a wide range of different designs, shapes, and sizes in order to fit patient knee anatomy as well as possible and to minimise wear [8,10]. Surgery success depends on the accurate selection of the prosthesis design as well as on correct sizing of the implant [11].…”

Section: Introductionmentioning

confidence: 99%

Does knee implant size affect wear variability?

Affatato

Grillini

Battaglia

et al. 2013

Tribology International

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“…Howcroft et al [1] found marked variations in the accuracy of templating with the accuracy varying between 38 and 75% for three different prostheses types. A reason for this variation can be explained by the varying degree of magnification needed for the different prostheses (115% for the one and 110% for the other).…”

Section: Discussionmentioning

confidence: 99%

“…In some instances a compromise have to be made where the patient's anterior-posterior/medial-lateral ratio is different to the average. Howcroft et al [1] suggested that the use of templating in total knee arthroplasty be interpreted with caution and further urge the development of more accurate sizing techniques.…”

Section: Introductionmentioning

confidence: 99%

Method for selection of femoral component in total knee arthroplasty (tka)

Heever

Scheffer

Erasmus

et al. 2011

Australas Phys Eng Sci Med

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A method is proposed enabling a surgeon to preoperatively determine the preeminent type and size of prosthesis, from those available, to be used in a particular patient undergoing knee replacement surgery. Parameters of healthy knee geometry were estimated by employing an unsupervised neural network. These estimated parameters were then applied in a χ(2) goodness of fit (GoF) test to determine which femoral prosthesis type and size delivers the most appropriate fit. This approach was used to determine the most suitable match of three implants for 34 different cases. Implant C performed the best and was the optimal fit in 59% of the cases, Implant A was the best fit in 38% of the cases and Implant B the best fit in 3% of the cases. This method shows promise in aiding a surgeon to select the optimal prosthesis type and size from an array of different conventional total knee replacements.

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The role of preoperative templating in total knee arthroplasty: Comparison of three prostheses

Cited by 29 publications

References 8 publications

Toward the interpretation of the combined effect of size and body weight on the tribological performance of total knee prostheses

Toward the interpretation of the combined effect of size and body weight on the tribological performance of total knee prostheses

Does knee implant size affect wear variability?

Method for selection of femoral component in total knee arthroplasty (tka)

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