Abstract:
:The alterations in thigh muscle properties of chondromalacia patellae patients during isometric and dynamic endurance tests were studied using a variokinetic knee testing system linked to surface EMG. A total of 41 patients (chondromalacia group) with arthroscopically certified chondromalacia of the patella were studied. The control group consisted of 31 healthy adult volunteers with no history of knee pain or trauma. Peak torque values were 21% (p < 0.01) and force output values 25% (p < 0.05) lower on the symptomatic side of the chondromalacia group than in the control group. The decrease in the ratio between integrated EMG (IEMG) and measured force were found in all parts of the quadriceps femoris muscle in patients with chondromalacia of the patella in isometric extension. No change in the normalized IEMG levels of the thigh muscles were found between chondromalacia patients and controls in dynamic endurance test. The severity of the chondromalacia of the patella did not affect the level of electromyographic activation in thigh muscles. The ratio of normalized EMG levels of vastus medialis and vastus lateralis did not differ between the groups. The present study showed that chondromalacia patellae patients have reduced force and electromyographic activation levels of quadriceps femoris muscle. Especially, the explosive strength of the quadriceps femoris muscle is reduced.
journal_name
Int J Sports Medjournal_title
International journal of sports medicineauthors
Väätäinen U,Airaksinen O,Jaroma H,Kiviranta Idoi
10.1055/s-2007-972962subject
Has Abstractpub_date
1995-01-01 00:00:00pages
45-50issue
1eissn
0172-4622issn
1439-3964journal_volume
16pub_type
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journal_title:International journal of sports medicine
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journal_title:International journal of sports medicine
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journal_title:International journal of sports medicine
pub_type: 杂志文章
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pub_type: 临床试验,杂志文章
doi:10.1055/s-2008-1025900
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pub_type: 杂志文章
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