Evaluation of body mass index as a prognostic factor in osteoarthrosis of the knee

Loures, Fabrício Bolpato; Góes, Rogério Franco de Araújo; Labronici, Pedro José; Barretto, João Maurício; Olej, Beni

doi:10.1016/j.rboe.2016.05.002

Brasil

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Original Articles • Rev. bras. ortop. 51 (04) • Jul-Aug 2016 • https://doi.org/10.1016/j.rboe.2016.05.002 linkcopy

Evaluation of body mass index as a prognostic factor in osteoarthrosis of the knee^{^☆}

Authorship SCIMAGO INSTITUTIONS RANKINGS

ABSTRACT

OBJECTIVE: To evaluate the relationship between patients' body mass index (BMI) and the degree of radiographic severity of knee osteoarthrosis.

METHOD: 117 patients with gonarthrosis were evaluated prospectively. The patients' BMI was calculated and their knee arthrosis was classified in accordance with the modified Ahlbäck criteria. Kruskal-Wallis analysis of variance (ANOVA) was used to evaluate the relationship between these two variables.

RESULTS: The group classified as Ahlbäck grade V had significantly higher BMI than the others.

CONCLUSION: There is a direct relationship between BMI and the degree of radiographic severity of gonarthrosis. Obesity appears to be directly related to the progression of knee osteoarthrosis.

Keywords: Osteoarthrosis; Obesity; Knee; Arthroplasty

Classification	BMI (kg/m²)
Underweight	<18.5
Normal weight	18.5–24.9
Overweight	25.0–29.9
Obese class I	30.0–34.9
Obese class II	35.0–39.9
Obese class III	≥ 40.0

Variable	Mean	SD	Median	Minimum	Maximum
Age (years)	68.9	7.1	68.5	53	84
Weight	77.3	13.4	77	53	120
Height (m)	1.6	0.1	1.62	1.4	1.9
BMI (kg/m2)	29.3	4.5	28.7	20.3	43.4

Grade	Number	Mean	SD	Median	Minimum	Maximum	p-Value^a
II	10	29.3	5.3	29.5	21.8	36.0	0.047
III	59	29.2	4.6	28.9	20.3	43.4
IV	30	28.2	3.6	28.0	23.3	37.4
V	18	31.9	4.3	32.8	24.0	38.3

Grade	Number	Mean	SD	Median	Minimum	Maximum	p-Value^a
II	10	65.0	7.0	64.5	55	74	0.20
III	59	69.0	6.8	68.5	55	82
IV	30	68.8	6.0	68	58	79
V	18	70.7	9.2	73	53	84

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Sociedade Brasileira de Ortopedia e Traumatologia Al. Lorena, 427 14º andar, 01424-000 São Paulo - SP - Brasil, Tel.: 55 11 2137-5400 - São Paulo - SP - Brazil
E-mail: rbo@sbot.org.br

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[TFN1] Source: WHO. ¹²

Grade I	Joint space narrowing
Grade II	Joint space obliteration
Grade III	AP=tibial plateau attrition<5mmProfile=posterior part of the tibial plateau intact
Grade IV	AP= 5–10mm tibial plateau attritionProfile=extensive attrition the posterior part of the tibial plateau
Grade V	AP= Severe subluxation of the tibiaProfile=anterior tibial subluxation >10mm

Evaluation of body mass index as a prognostic factor in osteoarthrosis of the knee☆

ABSTRACT

Evaluation of body mass index as a prognostic factor in osteoarthrosis of the knee^{^☆}