The robustness and accuracy of in vivo linear wear measurements for knee prostheses based on model-based RSA

IJsseldijk, E.A. van; Valstar, Edward R.; Stoel, Berend C.; Nelissen, Rob G H H; Reiber, Johan H. C.; Kaptein, Bart L

doi:10.1016/j.jbiomech.2011.08.013

Cited by 21 publications

(29 citation statements)

References 18 publications

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“…9,10 Afterwards, the mJSW between the 3D models is measured with a similar technique used for the measurement of polyethylene wear in total knee prostheses. 11 With this technique, the condyles of the tibia model are retrieved and the shortest perpendicular distance to the femoral model is measured. A particular challenge of this 3D reconstruction is that patient-specific 3D models of the tibia and femur are not readily available.…”

Section: Introductionmentioning

confidence: 99%

Three dimensional measurement of minimum joint space width in the knee from stereo radiographs using statistical shape models

IJsseldijk

Valstar

Stoel

et al. 2016

Bone & Joint Research

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ObjectivesAn important measure for the diagnosis and monitoring of knee osteoarthritis is the minimum joint space width (mJSW). This requires accurate alignment of the x-ray beam with the tibial plateau, which may not be accomplished in practice. We investigate the feasibility of a new mJSW measurement method from stereo radiographs using 3D statistical shape models (SSM) and evaluate its sensitivity to changes in the mJSW and its robustness to variations in patient positioning and bone geometry.Materials and MethodsA validation study was performed using five cadaver specimens. The actual mJSW was varied and images were acquired with variation in the cadaver positioning. For comparison purposes, the mJSW was also assessed from plain radiographs. To study the influence of SSM model accuracy, the 3D mJSW measurement was repeated with models from the actual bones, obtained from CT scans.ResultsThe SSM-based measurement method was more robust (consistent output for a wide range of input data/consistent output under varying measurement circumstances) than the conventional 2D method, showing that the 3D reconstruction indeed reduces the influence of patient positioning. However, the SSM-based method showed comparable sensitivity to changes in the mJSW with respect to the conventional method. The CT-based measurement was more accurate than the SSM-based measurement (smallest detectable differences 0.55 mm versus 0. 82 mm, respectively).ConclusionThe proposed measurement method is not a substitute for the conventional 2D measurement due to limitations in the SSM model accuracy. However, further improvement of the model accuracy and optimisation technique can be obtained. Combined with the promising options for applications using quantitative information on bone morphology, SSM based 3D reconstructions of natural knees are attractive for further development.Cite this article: E. A. van IJsseldijk, E. R. Valstar, B. C. Stoel, R. G. H. H. Nelissen, N. Baka, R. van’t Klooster, B. L. Kaptein. Three dimensional measurement of minimum joint space width in the knee from stereo radiographs using statistical shape models. Bone Joint Res 2016;320–327. DOI: 10.1302/2046-3758.58.2000626.

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Section: Introductionmentioning

confidence: 99%

Three dimensional measurement of minimum joint space width in the knee from stereo radiographs using statistical shape models

IJsseldijk

Valstar

Stoel

et al. 2016

Bone & Joint Research

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“…16,17 We developed and validated such a measurement method in a previous study. 18 Now, this measurement technique can be applied to previous RSA studies on TKA migration, potentially providing information on wear progression.…”

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confidence: 99%

Measuring polyethylene wear in total knee arthroplasty by RSA: Differences between weight‐bearing and non‐weight‐bearing positioning

IJsseldijk

Valstar

Stoel

et al. 2014

Journal Orthopaedic Research

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Measuring the minimum-joint-space-width (mJSW) in total knee arthroplasty (TKA) in Roentgen stereophotogrammetric analysis (RSA) provides valuable information on polyethylene wear, a leading cause for TKA failure. Most existing studies use nonweight-bearing (NWB) patient positioning. The latter may compromise mJSW measurements due to knee laxity with subsequent noncontact between the TKA components. We investigated the difference in mJSW between weight-bearing (WB) and NWB images and the association with mediolateral (ML) knee stability. At one-year follow-up, 23 TKAs were included from an ongoing RSA study, and ML stability was evaluated. For each examination, the mJSW and femoral-tibial contact locations were measured. A linear regression model was used to analyze the association between the mJSW difference (NWB-WB) with the ML stability and contact locations. The mean mJSW difference was 0.28 mm medially and 0.20 mm laterally. Four TKAs had medium (5-9˚) and 19 TKAs had high (<5˚) ML stability. A higher mJSW difference was found for TKAs with medium stability (0.36 mm, P ¼ 0.01). In conclusion, mJSW measurements in existing (NWB) RSA studies are influenced by knee laxity, but may still provide information on wear progression based on TKA with high ML stability. A direct comparison of mJSW measurements from WB and NWB data is not possible. ß

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“…Contact‐loss between the articulating surfaces was measured using the mJSW. The mJSW was calculated as the shortest distance between the surface of the femur CAD model perpendicular to the surface of the flat tibial CAD model, using a validated method …”

Section: Methodsmentioning

confidence: 99%

Oxford medial unicompartmental knees display contact‐loss during step‐cycle motion and bicycle motion: A dynamic radiostereometric study

Horsager

Kaptein

Jørgensen

et al. 2017

Journal Orthopaedic Research

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The Oxford medial unicompartmental knee is designed fully congruent, with the purpose of maintaining a large contact-area throughout motion and minimize wear. No other study has investigated this design feature in-vivo. We aimed to evaluate if contact-loss was introduced between the articulating surfaces of the Oxford medial unicompartmental knee during bicycle- and step-cycle motion, and whether this correlated with essential implant parameters, such as polyethylene (PE) wear, knee-loadings, and clinical outcome. To study contact-loss, 15 patients (12 males, mean age 69 years) with an Oxford medial unicompartmental knee (7 cemented, mean follow-up 4.4 years) were examined with use of dynamic radiostereometry (RSA) (10 frames/s). PE wear was measured from static RSA and clinical outcome was evaluated with American Knee Society Score (AKSS) and Oxford Knee Score (OKS). Data on knee-loadings were acquired from the literature. Contact-loss was deteced in all patients during both exercises, and the trend of contact-loss correlated with the knee-loadings. Median contact-loss was 0.8 mm (95%PI: 0.3; 1.5) for bicycle motion and 0.3 mm (95%PI: 0.24; 0.35) for step-cycle motion, and did not correlate with the PE wear rate of mean 0.06 mm/year. Possible in-congruency was seen in three patients. Clinical outcome scores correlated with contact-loss during step-cycle motion. In conclusion, contact-loss was seen in all patients indicating a clinical tolerance during load. Contact-loss followed the knee-loadings, which could explain why no correlation was seen with PE wear, as an increase in load was acommadated by an increase in contact-area (contact-loss reduction). The size of contact-loss may reflect clinical outcome. © 2017 Orthopaedic Research Society. Published by Wiley Periodicals, Inc. J Orthop Res 36:357-364, 2018.

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The robustness and accuracy of in vivo linear wear measurements for knee prostheses based on model-based RSA

Cited by 21 publications

References 18 publications

Three dimensional measurement of minimum joint space width in the knee from stereo radiographs using statistical shape models

Three dimensional measurement of minimum joint space width in the knee from stereo radiographs using statistical shape models

Measuring polyethylene wear in total knee arthroplasty by RSA: Differences between weight‐bearing and non‐weight‐bearing positioning

Oxford medial unicompartmental knees display contact‐loss during step‐cycle motion and bicycle motion: A dynamic radiostereometric study

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