Ultrasound-based classification and rehabilitation of biceps femoris T-junction injuries

The T-junction represents the interface between the long and short heads of the biceps femoris, comprising superficial myo-tendinous and deeper myo-aponeurotic connective-tissue components. Injury to this region is frequently under-recognised on MRI and associated with prolonged recovery and recurrence. A new ultrasound-based classification system is proposed, defining five subtypes according to structural involvement, myofascial extension, haematoma formation, and dynamic behaviour during resisted contraction. This classification system does require testing <i>in vivo</i> to establish validity. Ultrasound provides superior spatial resolution and allows direct assessment of tendon continuity and motion between the long and short heads. Rehabilitation strategies are aligned with injury subtype and guided by ultrasound findings rather than time alone. The approach integrates early protection and reactivation with progressive restoration of intermuscular coordination, strength, and high-speed load tolerance. The framework provides a structured method for diagnosis, prognosis, and rehabilitation planning in athletes with T-junction injuries of the biceps femoris.