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Query: UMLS:C0231749 (knee pain)
 2,815 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

Various authors have indicated that muscle imbalances might lead to knee pain and the potential for knee injury during sports. However, few reports have been published to substantiate such a hypothesis. But in all of the existing studies, only concentric torque measurements were evaluated. The purpose of the present study was to document any torque deficiencies which might be present during eccentric exercise in patients with knee pain. Of 130 patients with various knee disorders, 41 demonstrated a suppression in torque production during the eccentric exercise and generally in the portion of the range of movement between 30 degrees and 60 degrees of knee flexion (P less than 0.05). These individuals fit the criteria for anterior knee pain syndrome and demonstrated remarkable improvement after training 3 times/wk at concentric-eccentric exercises of the knee extensors at various speeds (30 degrees, 60 degrees, and 90 degrees . s-1) on a computer-controlled dynamometer (KIN/COM). In some cases, the pain as well as their torque deficiency was relieved after only 2 wk of training, most others were relieved after 2 to 4 wk of training.
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PMID:Evaluation and treatment of anterior knee pain using eccentric exercise. 377 69

The purpose of the present investigation was to estimate the percentage of asymptomatic subjects who demonstrate an eccentric/concentric torque deficit in leg extension. One hundred and five subjects with a mean age of 23.51 were tested on the KIN-COM(R) dynamometer for maximum eccentric and concentric torque during leg extension using an 80 degrees range of motion at 50 degrees /sec velocity. The subjects were categorized as demonstrating a deficit if at any point in the range of motion the eccentric torque was 85% or less of the corresponding concentric torque. The results revealed that 35-54% of the subjects, depending upon sex or leg tested, demonstrated a deficit. These results suggest that many asymptomatic individuals possess an eccentric/concentric torque deficit. These findings question the validity of previous clinical research indicating that patients with anterior knee pain tend to possess an eccentric/concentric torque deficit and that correction of the deficit alleviates the pain. J Orthop Sports Phys Ther 1989;11(4):142-145.
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PMID:Eccentric/Concentric torque deficits in the quadriceps muscle. 1879 19