Al-ʿaḍud is an upper arm or upper forelimb. Ajnaḥat conveys inclination or angling, while al-saqīf evokes a roof-like structural arrangement. Musannad means supported or propped up.
The image therefore does not describe limbs collapsing in weakness. Their angles resemble a deliberate construction whose members lean in a stable, supported arrangement. This is a comparison of architecture and anatomy, especially the alignment of the forelimbs.