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The significance of an asymmetric extension gap on routine radiographs after total knee replacement: A new sign and its clinical significance

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The significance of an asymmetric extension gap on routine radiographs after total knee replacement: A new sign and its clinical significance. / Liebs, T R; Kloos, S-A; Herzberg, W; Ruether, Wolfgang; Hassenpflug, J.

In: BONE JOINT J, Vol. 95-B, No. 4, 01.04.2013, p. 472-7.

Research output: SCORING: Contribution to journal › SCORING: Journal article › Research › peer-review

Harvard

Liebs, TR, Kloos, S-A, Herzberg, W, Ruether, W & Hassenpflug, J 2013, 'The significance of an asymmetric extension gap on routine radiographs after total knee replacement: A new sign and its clinical significance', BONE JOINT J, vol. 95-B, no. 4, pp. 472-7. https://doi.org/10.1302/0301-620X.95B4.31080

APA

Liebs, T. R., Kloos, S-A., Herzberg, W., Ruether, W., & Hassenpflug, J. (2013). The significance of an asymmetric extension gap on routine radiographs after total knee replacement: A new sign and its clinical significance. BONE JOINT J, 95-B(4), 472-7. https://doi.org/10.1302/0301-620X.95B4.31080

Vancouver

Liebs TR, Kloos S-A, Herzberg W, Ruether W, Hassenpflug J. The significance of an asymmetric extension gap on routine radiographs after total knee replacement: A new sign and its clinical significance. BONE JOINT J. 2013 Apr 1;95-B(4):472-7. https://doi.org/10.1302/0301-620X.95B4.31080

Bibtex

@article{7d9f365157154a898d44a0d3562f6b69,
title = "The significance of an asymmetric extension gap on routine radiographs after total knee replacement: A new sign and its clinical significance",
abstract = "We investigated whether an asymmetric extension gap seen on routine post-operative radiographs after primary total knee replacement (TKR) is associated with pain at three, six, 12 and 24 months' follow-up. On radiographs of 277 patients after primary TKR we measured the distance between the tibial tray and the femoral condyle on both the medial and lateral sides. A difference was defined as an asymmetric extension gap. We considered three groups (no asymmetric gap, medial-opening and lateral-opening gap) and calculated the associations with the Western Ontario and McMaster Universities osteoarthritis index pain scores over time. Those with an asymmetric extension gap of ≥ 1.5 mm had a significant association with pain scores at three months' follow-up; patients with a medial-opening extension gap reported more pain and patients with a lateral-opening extension gap reported less pain (p = 0.036). This effect was still significant at six months (p = 0.044), but had lost significance by 12 months (p = 0.924). When adjusting for multiple cofounders the improvement in pain was more pronounced in patients with a lateral-opening extension gap than in those with a medial-opening extension gap at three (p = 0.037) and six months' (p = 0.027) follow-up.",
keywords = "Arthroplasty, Replacement, Knee, Cohort Studies, Follow-Up Studies, Humans, Knee Joint, Pain, Pain Measurement, Postoperative Complications, Time Factors",
author = "Liebs, {T R} and S-A Kloos and W Herzberg and Wolfgang Ruether and J Hassenpflug",
year = "2013",
month = apr,
day = "1",
doi = "10.1302/0301-620X.95B4.31080",
language = "English",
volume = "95-B",
pages = "472--7",
journal = "BONE JOINT J",
issn = "2049-4394",
publisher = "British Editorial Society of Bone and Joint Surgery",
number = "4",

}

RIS

TY - JOUR

T1 - The significance of an asymmetric extension gap on routine radiographs after total knee replacement: A new sign and its clinical significance

AU - Liebs, T R

AU - Kloos, S-A

AU - Herzberg, W

AU - Ruether, Wolfgang

AU - Hassenpflug, J

PY - 2013/4/1

Y1 - 2013/4/1

N2 - We investigated whether an asymmetric extension gap seen on routine post-operative radiographs after primary total knee replacement (TKR) is associated with pain at three, six, 12 and 24 months' follow-up. On radiographs of 277 patients after primary TKR we measured the distance between the tibial tray and the femoral condyle on both the medial and lateral sides. A difference was defined as an asymmetric extension gap. We considered three groups (no asymmetric gap, medial-opening and lateral-opening gap) and calculated the associations with the Western Ontario and McMaster Universities osteoarthritis index pain scores over time. Those with an asymmetric extension gap of ≥ 1.5 mm had a significant association with pain scores at three months' follow-up; patients with a medial-opening extension gap reported more pain and patients with a lateral-opening extension gap reported less pain (p = 0.036). This effect was still significant at six months (p = 0.044), but had lost significance by 12 months (p = 0.924). When adjusting for multiple cofounders the improvement in pain was more pronounced in patients with a lateral-opening extension gap than in those with a medial-opening extension gap at three (p = 0.037) and six months' (p = 0.027) follow-up.

AB - We investigated whether an asymmetric extension gap seen on routine post-operative radiographs after primary total knee replacement (TKR) is associated with pain at three, six, 12 and 24 months' follow-up. On radiographs of 277 patients after primary TKR we measured the distance between the tibial tray and the femoral condyle on both the medial and lateral sides. A difference was defined as an asymmetric extension gap. We considered three groups (no asymmetric gap, medial-opening and lateral-opening gap) and calculated the associations with the Western Ontario and McMaster Universities osteoarthritis index pain scores over time. Those with an asymmetric extension gap of ≥ 1.5 mm had a significant association with pain scores at three months' follow-up; patients with a medial-opening extension gap reported more pain and patients with a lateral-opening extension gap reported less pain (p = 0.036). This effect was still significant at six months (p = 0.044), but had lost significance by 12 months (p = 0.924). When adjusting for multiple cofounders the improvement in pain was more pronounced in patients with a lateral-opening extension gap than in those with a medial-opening extension gap at three (p = 0.037) and six months' (p = 0.027) follow-up.

KW - Arthroplasty, Replacement, Knee

KW - Cohort Studies

KW - Follow-Up Studies

KW - Humans

KW - Knee Joint

KW - Pain

KW - Pain Measurement

KW - Postoperative Complications

KW - Time Factors

U2 - 10.1302/0301-620X.95B4.31080

DO - 10.1302/0301-620X.95B4.31080

M3 - SCORING: Journal article

C2 - 23539698

VL - 95-B

SP - 472

EP - 477

JO - BONE JOINT J

JF - BONE JOINT J

SN - 2049-4394

IS - 4

ER -