Self-reported knee joint instability is related to passive mechanical stiffness in medial knee osteoarthritis

BMC Musculoskeletal Disorders

Kim L Bennell¹  Adam L Bryant¹  Rana S Hinman¹  Boon-Whatt Lim²  Tim V Wrigley¹  Mark W Creaby¹ 

[1] Centre for Health, Exercise & Sports Medicine, University of Melbourne, Melbourne, Victoria 3010, Australia;School of Sports, Health and Leisure, Republic Polytechnic, Singapore, Singapore

关键词: Varus-valgus laxity;    Instability;    Passive stiffness;    Knee osteoarthritis;   

Others  :  1129161
DOI  :  10.1186/1471-2474-14-326

 received in 2013-07-08, accepted in 2013-11-15,  发布年份 2013

【 摘 要 】

Background

Self-reported knee joint instability compromises function in individuals with medial knee osteoarthritis and may be related to impaired joint mechanics. The purpose of this study was to evaluate the relationship between self-reported instability and the passive varus-valgus mechanical behaviour of the medial osteoarthritis knee.

Methods

Passive varus-valgus angular laxity and stiffness were assessed using a modified isokinetic dynamometer in 73 participants with medial tibiofemoral osteoarthritis. All participants self-reported the absence or presence of knee instability symptoms and the degree to which instability affected daily activity on a 6-point likert scale.

Results

Forward linear regression modelling identified a significant inverse relationship between passive mid-range knee stiffness and symptoms of knee instability (r = 0.27; P < 0.05): reduced stiffness was indicative of more severe instability symptoms. Angular laxity and end-range stiffness were not related to instability symptoms (P > 0.05).

Conclusions

Conceivably, a stiffer passive system may contribute toward greater joint stability during functional activities. Importantly however, net joint stiffness is influenced by both active and passive stiffness, and thus the active neuromuscular system may compensate for reduced passive stiffness in order to maintain joint stability. Future work is merited to examine the role of active stiffness in symptomatic joint stability.

【 授权许可】

   
2013 Creaby et al.; licensee BioMed Central Ltd.

【 图 表 】

Figure 1.

Figure 2.

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