How should the knees be assessed from the side?

The correct choice involves using the greater trochanter and assessing its position in relation to the lateral malleolus when viewed from the side in conjunction with a plumb line. This method allows for a clear evaluation of knee alignment and positions it within the context of the overall kinetic chain.

When utilizing the greater trochanter, which is found at the hip, and aligning it with the lateral malleolus, which is located on the outer aspect of the ankle, a practitioner can determine if the knee is properly aligned in relation to the ankle and hip. The plumb line serves as a vertical reference point, providing an objective measure for assessing deviations such as genu valgum (knock-knees) or genu varum (bowlegs).

The other options, while relevant to knee assessment in different contexts, do not focus specifically on the alignment assessment from the side view. Measuring the length of the thigh provides useful information but does not address the knee's position in relation to other key anatomical landmarks. Observing overall stability of the leg can offer insights into function but lacks the precision necessary for alignment assessment. Finally, determining the range of motion at the knee joint is important for mobility assessment but does not specifically quantify alignment based on the anatomical landmarks mentioned.