RESUMO
Background and Aim: Patellofemoral pain syndrome [PFPS] is among the most common musculoskeletal disorders in the athletes and active individuals
Observation of muscular responses to unexpected perturbations is one of the most common methods to evaluate the neural strategies. The aim of this study was to evaluate the EMG response of vastus muscles to dynamic postural perturbations in the athletes with PFPS
Material and Method: This study included 10 male athletes with PFPS and 10 healthy male athletes. NPRS scale was used to assess pain. EMG activity of VMO and VL muscles measured during dynamic postural perturbation. The EMG signals were collected using a 16-channel BTS-FREEEMG 300 system, manufactured in Italy. Independent-1 test was used for data analysis
Results: RMS values for VMO and VL muscles in PFPS group, were higher than the corresponding values of the control group by 33.59% and 33.35% respectively, in the forward postural perturbation. There was a significant difference in VL muscle RMS values between the two groups [P=0.04]
RMS values for VMO and VL muscles in PFPS group were higher than those of the control group by 38% and 49.52% respectively, in the backward postural perturbation and there was a significant difference in VL muscle RMS values between the two groups [P=0.04]
Conclusion: The results showed that valtus muscles were more active in response to dynamic postural perturbation in the athletes with PFPS in comparison to the healthy athletes
Patellofemoral pain syndrome and in general joint disorders can lead to dysfunction in the whole sensory-motor system
Therefore, instead of focusing on local symptoms we should examine the whole body in sensory-motor system dysfunction
RESUMO
The concept of evaluating the musculoskeletal system with ultrasound was initially introduced in the late 1970s. For evaluating meniscal tears, which are a common injury in traumatic events of knee, linear probes with high resolution have been used. In this study, we compared the results of sonography with arthroscopy in diagnosing bucket h and le tear of meniscus and MCL tear. 218 clinically symptomatic knee joints with clinical indication of arthroscopy were examined by sonography in a referral sport medicine center. The patients eventually had arthroscopic exam. The results were compared, and statistically analyzed using Fisher's exact. In this study, of 218 patient who had arthroscopy and sonography, the sensitivity and specificity of sonography in meniscal tear were 68.1% and 100%, respectively. 34 patients had bucket h and le tear of the posterior horn of the medial meniscus on sonography; six cases [17.6%] of which had abnormally small posterior horns of medial meniscus [in favor of meniscal tear] but in 60 patients with other types of meniscal tear, sonography revealed tear in 58 [96.6%][P < 0.0001]. Six patients had complete MCL tear in arthroscopy, while in sonography 4 complete MCL tears were shown. Sensitivity of ultrasound in diagnosing complete MCL tear was 66.6% and specificity of 98%. Ultrasound is easily applicable in evaluation of knee derangement: however, for bucket h and le tears it has limited application. For MCL tears, sonography seems an accurate method. Ultrasonography is rapid, low-cost and non-invasive examination