Modalities, Manual Therapy, and Adjunctive Rehabilitation Interventions
Core concepts
Understand the physiologic basis, indications, contraindications, and dosing of therapeutic modalities: cryotherapy, superficial and deep heat, therapeutic ultrasound, electrical stimulation (neuromuscular electrical stimulation and transcutaneous electrical nerve stimulation), laser, extracorporeal shockwave, and photobiomodulation. Know manual therapy: joint mobilization grades, soft-tissue mobilization, massage, and stretching, with their proposed mechanisms (neurophysiologic and mechanical). Be able to distinguish modality effects that are primarily analgesic from those that aim to alter tissue healing or strength, and know safety limits (e.g., heat over acute inflammation, electrical stimulation over the thorax or in animals with cardiac or neurologic implants, laser near the eye).
Traps
Items frequently test contraindications rather than benefits, and often misattribute strength gains to a modality that only reduces pain. Watch for confusion between superficial and deep heating depth, or between the goals of neuromuscular electrical stimulation (motor recruitment) and transcutaneous electrical nerve stimulation (sensory analgesia).
Worked example / rule of thumb
A dog with chronic osteoarthritis and muscle atrophy: use cryotherapy after exercise for analgesia, then neuromuscular electrical stimulation to aid motor recruitment, plus manual therapy for joint mobility. Rule of thumb: a modality is an adjunct-if it does not enable a functional exercise goal, its value is limited.