Morphofunctional Profile Focusing on Strength and Ultrasound of the Upper Limbs in Female Breast Cancer Survivors: A Comparative Cross-Sectional Study Between Groups with and Without Lymphoedema and Between Ipsilateral and Contralateral Limbs.

: Breast cancer is the most common neoplasm in women. Despite effective treatments, sequelae such as decreased muscle strength, upper limb dysfunction, and tissue changes are common, highlighting the need for functional assessments during rehabilitation. This study analysed the morphofunctional profile of the upper limbs in breast cancer survivors, comparing muscle strength and ultrasound findings between groups with and without lymphoedema, as well as between ipsilateral and contralateral limbs. : This cross-sectional study included female breast cancer survivors treated at an oncology physical therapy clinic. Muscle strength was measured using dynamometry (handgrip and arm flexor strength), and ultrasound assessed the thickness of the dermal-epidermal complex (DEC), subcutaneous tissue (SUB), and muscle (MT). : The upper limbs of 41 women were evaluated. No significant differences were observed between those with and without breast cancer-related lymphoedema (BCRL). When comparing the ipsilateral and contralateral limbs, significant reductions were observed in arm flexor strength ( < 0.001; 95% CI: -9.77 to -2.50), handgrip strength ( < 0.001; 95% CI: -4.10 to -1.22), and tissue thickness, with increased DEC thickness on the forearm (0.20 mm; = 0.022) and arm flexors (0.25 mm; < 0.001) of the ipsilateral limb. : Significant differences in muscle strength and tissue structure between ipsilateral and contralateral limbs may reflect surgical and local pathophysiological effects. A trend toward reduced values for these parameters was also noted in limbs with BCRL, reinforcing the importance of future research to elucidate underlying mechanisms and guide more effective therapeutic strategies.