The natural history of anteroposterior laxity and its role in knee osteoarthritis progression

Nimesh Dayal, Alison Hsin-I Chang, Dorothy D Dunlop, Karen Hayes, Rowland W Chang, September Cahue, Jing Song, Leah Torres, Leena Sharma*

*Corresponding author for this work

Research output: Contribution to journalArticle

25 Citations (Scopus)

Abstract

Objective. To test the hypotheses that 1) osteoarthritic (OA) knees at more advanced stages have less anteroposterior (AP) laxity compared with OA knees at milder stages, 2) AP laxity decreases over time, and 3) the absence of a decrease in AP laxity is associated with greater progression of medial tibiofemoral OA. Methods. The study group comprised 230 patients with knee OA (75% women, mean age 64 years, mean body mass index [BMI] 30 kg/m2). At baseline and 18 months, AP laxity was measured (in millimeters of tibial translation, under AP shear loading), and semiflexed AP knee radiographs (with knee position confirmed by fluoroscopy) were obtained. Osteophytes were graded for each compartment, using a scale of 0-4. Disease progression was measured as the amount of medial joint space loss between baseline and followup, using linear regression with generalized estimating equations. Results. At baseline, measurements of AP laxity were lower in knees with a Kellgren/Lawrence (K/L) score of 4 (mean ± SD 5.0 ± 2.1 mm) than in those with a K/L score of 0-1 (mean ± SD 7.1 ± 2.6 mm). There was a weak negative correlation between osteophyte grade and AP laxity. In knees with a K/L score of 0-2, AP laxity was slightly lower at 18 months than at baseline. AP laxity at baseline was not a predictor of progression of OA. Knees without a decrease in AP laxity had a greater loss of medial joint space (0.22 mm greater, after adjusting for age, sex, and BMI) than did knees in which laxity decreased. Conclusion. AP laxity at baseline is not predictive of progression of OA. Although knees with a K/L score of 4 had less AP laxity than those with a K/L score of 0-1, most of this difference was attributable to the significant difference in AP laxity between knees with a K/L score of 0-1 and knees with a K/L score of 2 (i.e., definite osteophytes). Knees in which AP laxity decreased had less medial joint space loss than did knees without a decrease in AP laxity. The knee joint may successfully compensate for AP laxity; the absence of such compensation may have a deleterious effect.

Original languageEnglish (US)
Pages (from-to)2343-2349
Number of pages7
JournalArthritis and rheumatism
Volume52
Issue number8
DOIs
StatePublished - Aug 1 2005

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Knee Osteoarthritis
Natural History
Knee
Osteophyte
Joints
Body Mass Index
Fluoroscopy
Knee Joint
Disease Progression
Linear Models

ASJC Scopus subject areas

  • Immunology and Allergy
  • Rheumatology
  • Immunology
  • Pharmacology (medical)

Cite this

@article{7d3bdac4b5b243f5baf8924868437ff8,
title = "The natural history of anteroposterior laxity and its role in knee osteoarthritis progression",
abstract = "Objective. To test the hypotheses that 1) osteoarthritic (OA) knees at more advanced stages have less anteroposterior (AP) laxity compared with OA knees at milder stages, 2) AP laxity decreases over time, and 3) the absence of a decrease in AP laxity is associated with greater progression of medial tibiofemoral OA. Methods. The study group comprised 230 patients with knee OA (75{\%} women, mean age 64 years, mean body mass index [BMI] 30 kg/m2). At baseline and 18 months, AP laxity was measured (in millimeters of tibial translation, under AP shear loading), and semiflexed AP knee radiographs (with knee position confirmed by fluoroscopy) were obtained. Osteophytes were graded for each compartment, using a scale of 0-4. Disease progression was measured as the amount of medial joint space loss between baseline and followup, using linear regression with generalized estimating equations. Results. At baseline, measurements of AP laxity were lower in knees with a Kellgren/Lawrence (K/L) score of 4 (mean ± SD 5.0 ± 2.1 mm) than in those with a K/L score of 0-1 (mean ± SD 7.1 ± 2.6 mm). There was a weak negative correlation between osteophyte grade and AP laxity. In knees with a K/L score of 0-2, AP laxity was slightly lower at 18 months than at baseline. AP laxity at baseline was not a predictor of progression of OA. Knees without a decrease in AP laxity had a greater loss of medial joint space (0.22 mm greater, after adjusting for age, sex, and BMI) than did knees in which laxity decreased. Conclusion. AP laxity at baseline is not predictive of progression of OA. Although knees with a K/L score of 4 had less AP laxity than those with a K/L score of 0-1, most of this difference was attributable to the significant difference in AP laxity between knees with a K/L score of 0-1 and knees with a K/L score of 2 (i.e., definite osteophytes). Knees in which AP laxity decreased had less medial joint space loss than did knees without a decrease in AP laxity. The knee joint may successfully compensate for AP laxity; the absence of such compensation may have a deleterious effect.",
author = "Nimesh Dayal and Chang, {Alison Hsin-I} and Dunlop, {Dorothy D} and Karen Hayes and Chang, {Rowland W} and September Cahue and Jing Song and Leah Torres and Leena Sharma",
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The natural history of anteroposterior laxity and its role in knee osteoarthritis progression. / Dayal, Nimesh; Chang, Alison Hsin-I; Dunlop, Dorothy D; Hayes, Karen; Chang, Rowland W; Cahue, September; Song, Jing; Torres, Leah; Sharma, Leena.

In: Arthritis and rheumatism, Vol. 52, No. 8, 01.08.2005, p. 2343-2349.

Research output: Contribution to journalArticle

TY - JOUR

T1 - The natural history of anteroposterior laxity and its role in knee osteoarthritis progression

AU - Dayal, Nimesh

AU - Chang, Alison Hsin-I

AU - Dunlop, Dorothy D

AU - Hayes, Karen

AU - Chang, Rowland W

AU - Cahue, September

AU - Song, Jing

AU - Torres, Leah

AU - Sharma, Leena

PY - 2005/8/1

Y1 - 2005/8/1

N2 - Objective. To test the hypotheses that 1) osteoarthritic (OA) knees at more advanced stages have less anteroposterior (AP) laxity compared with OA knees at milder stages, 2) AP laxity decreases over time, and 3) the absence of a decrease in AP laxity is associated with greater progression of medial tibiofemoral OA. Methods. The study group comprised 230 patients with knee OA (75% women, mean age 64 years, mean body mass index [BMI] 30 kg/m2). At baseline and 18 months, AP laxity was measured (in millimeters of tibial translation, under AP shear loading), and semiflexed AP knee radiographs (with knee position confirmed by fluoroscopy) were obtained. Osteophytes were graded for each compartment, using a scale of 0-4. Disease progression was measured as the amount of medial joint space loss between baseline and followup, using linear regression with generalized estimating equations. Results. At baseline, measurements of AP laxity were lower in knees with a Kellgren/Lawrence (K/L) score of 4 (mean ± SD 5.0 ± 2.1 mm) than in those with a K/L score of 0-1 (mean ± SD 7.1 ± 2.6 mm). There was a weak negative correlation between osteophyte grade and AP laxity. In knees with a K/L score of 0-2, AP laxity was slightly lower at 18 months than at baseline. AP laxity at baseline was not a predictor of progression of OA. Knees without a decrease in AP laxity had a greater loss of medial joint space (0.22 mm greater, after adjusting for age, sex, and BMI) than did knees in which laxity decreased. Conclusion. AP laxity at baseline is not predictive of progression of OA. Although knees with a K/L score of 4 had less AP laxity than those with a K/L score of 0-1, most of this difference was attributable to the significant difference in AP laxity between knees with a K/L score of 0-1 and knees with a K/L score of 2 (i.e., definite osteophytes). Knees in which AP laxity decreased had less medial joint space loss than did knees without a decrease in AP laxity. The knee joint may successfully compensate for AP laxity; the absence of such compensation may have a deleterious effect.

AB - Objective. To test the hypotheses that 1) osteoarthritic (OA) knees at more advanced stages have less anteroposterior (AP) laxity compared with OA knees at milder stages, 2) AP laxity decreases over time, and 3) the absence of a decrease in AP laxity is associated with greater progression of medial tibiofemoral OA. Methods. The study group comprised 230 patients with knee OA (75% women, mean age 64 years, mean body mass index [BMI] 30 kg/m2). At baseline and 18 months, AP laxity was measured (in millimeters of tibial translation, under AP shear loading), and semiflexed AP knee radiographs (with knee position confirmed by fluoroscopy) were obtained. Osteophytes were graded for each compartment, using a scale of 0-4. Disease progression was measured as the amount of medial joint space loss between baseline and followup, using linear regression with generalized estimating equations. Results. At baseline, measurements of AP laxity were lower in knees with a Kellgren/Lawrence (K/L) score of 4 (mean ± SD 5.0 ± 2.1 mm) than in those with a K/L score of 0-1 (mean ± SD 7.1 ± 2.6 mm). There was a weak negative correlation between osteophyte grade and AP laxity. In knees with a K/L score of 0-2, AP laxity was slightly lower at 18 months than at baseline. AP laxity at baseline was not a predictor of progression of OA. Knees without a decrease in AP laxity had a greater loss of medial joint space (0.22 mm greater, after adjusting for age, sex, and BMI) than did knees in which laxity decreased. Conclusion. AP laxity at baseline is not predictive of progression of OA. Although knees with a K/L score of 4 had less AP laxity than those with a K/L score of 0-1, most of this difference was attributable to the significant difference in AP laxity between knees with a K/L score of 0-1 and knees with a K/L score of 2 (i.e., definite osteophytes). Knees in which AP laxity decreased had less medial joint space loss than did knees without a decrease in AP laxity. The knee joint may successfully compensate for AP laxity; the absence of such compensation may have a deleterious effect.

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