Bastiani Denise, Ritzel Cintia Helena, Bortoluzzi Silvia Manfrin, Vaz Marco Aurelio
Pontifícia Universidade Católica do Rio Grande do Sul.
Rev Bras Reumatol. 2012 Mar-Apr;52(2):195-202.
The inflammatory manifestations of knee osteoarthritis (OA) lead to muscle inhibition and hypotrophy, resulting in a reduction in total muscle work and muscle power. Total knee arthroplasty (TKA) is the most adequate surgery for the treatment of advanced OA. However, its effects on muscle functional behavior have not been well understood.
To compare the total work and power of the knee flexor and extensor muscles in patients with OA (20) and in patients post-TKA (12) at two angular velocities (60º/sec and 240º/sec).
An isokinetic Biodex dynamometer was used to assess muscle power and total work during isokinetic contractions. Two-way ANOVA for repeated measures was used to compare total muscle work and muscle power between the groups (SPSS software, version 13.0; significance level, P < 0.05).
There was no difference between the OA and TKA groups for the total work of both knee extensors and flexors at the two angular velocities (P > 0.05). In addition, no difference was observed in the muscle power of the knee extensors and flexors (P > 0.05).
Total work and power were similar in the OA and TKA groups, suggesting that TKA did not improve functional capacity, which was similar in both groups.
膝关节骨关节炎（OA）的炎症表现会导致肌肉抑制和萎缩，从而使肌肉总功和肌肉力量下降。全膝关节置换术（TKA）是治疗晚期OA最适宜的手术。然而，其对肌肉功能行为的影响尚未得到充分了解。
比较骨关节炎患者（20例）和全膝关节置换术后患者（12例）在两种角速度（60°/秒和240°/秒）下膝关节屈伸肌的总功和功率。
使用等速Biodex测力计评估等速收缩过程中的肌肉功率和总功。采用重复测量的双向方差分析比较两组之间的肌肉总功和肌肉功率（SPSS软件，版本13.0；显著性水平，P < 0.05）。
在两种角速度下，OA组和TKA组膝关节伸肌和屈肌的总功均无差异（P > 0.05）。此外，膝关节伸肌和屈肌的肌肉功率也未观察到差异（P > 0.05）。
OA组和TKA组的总功和功率相似，这表明TKA并未改善功能能力，两组的功能能力相似。
