Existence of Dose atrophy of Vastus medialis obliquus and Va
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Patellofemoral pain syndrome (PFPS) is one of the most common musculoskeletal complaints and is characterized as pain in the anterior knee region when performing activities such as sitting, stair climbing, running, and squatting. The purpose of this study was to evaluate whether Vastus medialis obliquus (VMO) and Vastus lateralis muscle (VLM) atrophy exists in patients with PFPS and whether the amount of atrophy differs between VMO and VLM. It is hypothesized that VMO and VLM atrophy existed in the patients with PFPS, and atrophy of the VMO was more evident than that of the VLM.

A Study was conducted in which 61 patients with patellofemoral pain syndrome were retrospectively included in the study group, and an age-, sex-, and body mass index-matched cohort of 61 patients with normal knees was randomly selected as the control group. All enrolled subjects had undergone CT scans in the supine position. The cross-sectional areas of the vastus medialis obliquus and the vastus lateralis muscle in the sections 0, 5, 10, 15, and 20 mm above the upper pole of the patella were measured, and the vastus medialis obliquus/vastus lateralis muscle area ratio was evaluated.

Results:
--In the study group, the vastus medialis obliquus areas and the vastus lateralis muscle areas in the sections that were 0, 5, 10, 15, and 20 mm above the upper pole of the patella were significantly smaller than the respective areas in the control group.

--The vastus medialis obliquus/vastus lateralis muscle area ratio was significantly smaller at the upper pole of the patella (the section 0 mm above the upper pole of the patella) than the corresponding ratio in the control group.

--No significant difference was noted between the two groups in the sections 5, 10, 15, and 20 mm above the upper pole of the patella.

In patients with patellofemoral pain syndrome, vastus medialis obliquus and vastus lateralis muscle atrophy existed in sections 0–20 mm above the upper pole of the patella, compared with normal controls, and atrophy of the vastus medialis obliquus was more evident than that of the vastus lateralis muscle at the upper pole of the patella.

Conclusively, these results support the reasoning for the use of general quadriceps exercise combined with vastus medialis obliquus strengthening exercise as part of the rehabilitation programme for the patients with patellofemoral pain syndrome.

Source: https://josr-online.biomedcentral.com/articles/10.1186/s13018-021-02251-6
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