Knee joint dynamics predict patellar tendinitis in elite volleyball players

Area of Science:

• Sports Medicine
• Biomechanics
• Orthopedics

Background:

• Patellar tendinitis is a common overuse injury in volleyball.
• Understanding the biomechanical factors contributing to this condition is crucial for prevention and treatment.

Purpose of the Study:

• To investigate the relationship between lower extremity biomechanics during volleyball jumps and the presence of patellar tendinitis.
• To identify specific jump dynamics that predict patellar tendinitis in volleyball players.

Main Methods:

• Kinematic and kinetic data were collected from 10 male volleyball players during spike and block jumps.
• Players were assessed for patellar tendinitis via physical examination.
• Logistic regression analysis was used to identify predictive biomechanical variables.

Main Results:

• Vertical ground-reaction force during takeoff significantly predicted patellar tendinitis (8/10 accuracy).
• Deepest knee flexion angle during landing accurately predicted patellar tendinitis for the left knee (10/10).
• External tibial torsional moments also significantly predicted tendinitis in specific jump/knee combinations.

Conclusions:

• High forces and loading rates in the knee extensor mechanism, combined with large tibial torsional moments and deep knee flexion, are associated with patellar tendinitis in volleyball players.
• Specific biomechanical parameters during jumping can predict the likelihood of developing patellar tendinitis.