Musculoskeletal Anatomy, Biomechanics, and Physiology
Core concepts
A candidate must be able to connect gross and functional anatomy to load transmission: muscle architecture (pennation angle, fiber length, physiologic cross-sectional area), tendon and enthesis structure, and the difference between contractile and connective-tissue adaptation. Understand lever systems in the limb (class of lever, moment arm, mechanical advantage), joint kinematics (roll, glide, spin; concave-on-convex rules), and the stance/swing or stance/stride cycle phases with their force and loading profiles. Know the basic mechanobiology: bone responds to strain magnitude and rate, tendon to controlled progressive load, cartilage to cyclic loading with recovery, and muscle to eccentric and high-velocity work. Also know energy systems and thermoregulation well enough to explain fatigue and heat intolerance in working animals.
Traps
Questions often conflate moment arm with muscle length, or ask which tissue adapts fastest (muscle and tendon earlier than bone or cartilage). Another trap is assuming a larger muscle produces more force without considering pennation and fiber length. Watch for items that describe joint glide direction incorrectly, or that attribute lameness solely to pain when mechanical compensation (compensatory overload of the contralateral limb) is the intended answer.
Worked example / rule of thumb
For a joint mobilization question, use the convex-on-concave rule: if the moving bone's articular surface is convex, it glides opposite the direction of the osteokinematic motion. Rule of thumb: proximal stability precedes distal mobility-assess core and proximal limb control before blaming a distal structure.