A New Anatomical Approach to T-Junction Hamstring Injuries.

Area of Science:

• Sports Medicine
• Anatomy
• Orthopedic Surgery

Background:

• Hamstring injuries are prevalent in football, with distal musculotendinous T-junction (DMTJ) injuries of the biceps femoris being common yet poorly understood.
• These injuries often lead to prolonged recovery and high rates of re-injury.
• The DMTJ is an anatomically variable structure formed by the confluence of the biceps femoris long and short heads.

Purpose of the Study:

• To investigate the association between the anatomical configuration of the DMTJ, specifically its deep connective tissue limb extent, and return-to-play (RTP) time.
• To determine if DMTJ anatomy correlates with the rate of re-injury after acute hamstring injuries.

Main Methods:

• A retrospective cohort study of 32 professional male football players with MRI-confirmed DMTJ injuries.
• Injuries were classified based on axial MRI into 'long T-junction' (>30% aponeurotic coverage) or 'short T-junction' (≤30%).
• Return-to-play times and 6-month reinjury rates were compared; cadaveric specimens were analyzed for anatomical detail.

Main Results:

• 16 injuries were classified as long T-junction and 16 as short.
• The long T-junction group experienced significantly longer RTP times (42.6 days vs. 28.9 days) and a higher reinjury rate (37.5% vs. 6.3%).
• Cadaveric dissections revealed significant variability in the depth and structure of the DMTJ connective tissue.

Conclusions:

• A greater deep extension of the DMTJ is linked to delayed recovery and an increased risk of re-injury.
• Recognizing the anatomical variability of the DMTJ can enhance injury classification, prognosis, and treatment strategies.
• Further prospective, multicenter research is recommended to validate these findings.