Different femorotibial contact points between fixed- and mobile-bearing TKAs do not show clinical impact

Stralen, Renée Anne van; Heesterbeek, Petra J.C.; Wymenga, A. B.

doi:10.1007/s00167-014-3178-z

Cited by 12 publications

(14 citation statements)

References 38 publications

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“…No difference was observed for KS scores. The mean (SD) FJS-12 score for the fixed bearing was 71 (28) compared to 56.5 (30) for the mobile bearing (Table 3).…”

Section: Resultsmentioning

confidence: 99%

“…Several authors attempted to compare fixed-and mobile-bearing TKA with conventional scores such as the WOMAC, Oxford, KSS, and VA Scores (VAS) and found no difference in clinical outcomes [1,16,20,30]. A jointspecific score that is more responsive such as the FJS-12 is a more discerning measure of patient outcome observing for the first time a difference between these two treatment options [11].…”

Section: Discussionmentioning

confidence: 99%

“…However, to the best of our knowledge, since there was not a "forgotten joint" score before, this statement has not been evaluated objectively previously [3,12]. Most of the previous studies performed to compare fixed-and mobile-bearing TKA could not demonstrate any difference utilizing conventional outcome scores [1,16,19,30].…”

Section: Introductionmentioning

confidence: 93%

See 2 more Smart Citations

Higher forgotten joint score for fixed-bearing than for mobile-bearing total knee arthroplasty

Thienpont

Zorman

2015

Knee Surg Sports Traumatol Arthrosc

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“…No difference was observed for KS scores. The mean (SD) FJS-12 score for the fixed bearing was 71 (28) compared to 56.5 (30) for the mobile bearing (Table 3).…”

Section: Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Higher forgotten joint score for fixed-bearing than for mobile-bearing total knee arthroplasty

Thienpont

Zorman

2015

Knee Surg Sports Traumatol Arthrosc

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show abstract

“…The femorotibial contact points at 90° of flexion and their relation with anterior knee pain were recently analyzed by van Stralen et al (19) using the study population of the randomized multi-centre trial of Jacobs et al (20). They found that the contact point was significantly more anterior in MB than in FB TKAs (59.5% SD 7.8 vs. 66.1% SD 5.3 of the tibial plateau), with the FB group comparable to the healthy non-prosthetic knees.…”

mentioning

confidence: 99%

Mobile bearing and fixed bearing total knee arthroplasty

Capella¹,

Dolfin²,

Saccia³

2016

Ann. Transl. Med.

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The mobile bearing (MB) concept in total knee arthroplasty (TKA) was developed as an alternative to fixed bearing (FB) implants in order to reduce wear and improve range of motion (ROM), especially focused on younger patients. Unfortunately, its theoretical advantages are still controversial. In this paper we exhibit a review of the more recent literature available comparing FB and MB designs in biomechanical and clinical aspects, including observational studies, clinical trials, national and international registries analyses, randomized controlled trials, meta-analyses and Cochrane reviews. Except for some minor aspects, none of the studies published so far has reported a significant improvement related to MBs regarding patient satisfaction, clinical, functional and radiological outcome or medium and long-term survivorship. Thus the presumed superiority of MBs over FBs appears largely inconsistent. The routine use of MB is not currently supported by adequate evidences; implant choice should be therefore made on the basis of other factors, including cost and surgeon experience.

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“…As the mobile bearing insert is not visible on x‐ray images, mobile bearing translations were estimated from the projected mJSW line. This point is also known as the femoro‐tibial contact point . The mJSW line reflect the center position of the bearing and the projected point on the tibia surface reflect the anterior‐posterior (AP) and medio‐lateral (ML) position of the bearing in respect to the flat tibial surface (Fig.…”

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.

show abstract

Different femorotibial contact points between fixed- and mobile-bearing TKAs do not show clinical impact

Abstract: Case series, Level IV.

Cited by 12 publications

References 38 publications

Higher forgotten joint score for fixed-bearing than for mobile-bearing total knee arthroplasty

Higher forgotten joint score for fixed-bearing than for mobile-bearing total knee arthroplasty

Mobile bearing and fixed bearing total knee arthroplasty

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

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