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Completed

NCT Number: NCT07578701

THE EFFECT OF CORRECTIVE EXERCISES ON Q ANGLE AND JUMP-LANDING MECHANICS

This study examines the effects of an 8-week structured corrective exercise program on Q angle and jump-landing mechanics (evaluated via the Landing Error Scoring System - LESS) in competitive young female volleyball players during their in-season period. Twenty-three athletes were assigned to either an experimental group receiving corrective exercises or a control group maintaining standard training. The primary goal is to determine if targeted biomechanical corrections can improve knee alignment and movement quality to mitigate injury risks.

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Key information

Conditions

Genu Valgum Athletic Injuries Biomechanical Phenomena Bone Diseases Knee Injuries Leg Injuries Musculoskeletal Diseases Wounds and Injuries

Age range

14 year–17 year

Sex eligibility

Female

Study type

Interventional

Phase

Not applicable

Primary location

Istanbul Gelisim University, Faculty of Sport Sciences

Istanbul, 34310, Turkey (Türkiye)

About this study

The intervention consists of a specialized corrective exercise program focused on body segment alignment and injury risk mitigation, performed over an 8-week duration. Assessments were conducted pre- and post-intervention, including:

Static Q angle measurements.

Biomechanical analysis using the Landing Error Scoring System (LESS).

Countermovement jump (CMJ) height to evaluate explosive power.

The study analyzes whether integrating these exercises into in-season training effectively reduces the Q angle and improves jump-landing mechanics compared to a control group performing only standard volleyball training.

Who can participate

Healthy volunteers accepted: Yes

Only the study team can determine whether someone qualifies for participation.

Inclusion criteria

Licensed young female volleyball players.

Aged between 14 and 17 years.

Willingness to participate voluntarily with parental and athlete consent.

Exclusion criteria

History of major lower extremity injuries or orthopedic surgery.

Presence of any musculoskeletal or neurological condition that prevents participation in the exercise program.

Lack of regular attendance at volleyball training sessions.

Treatment and study plan

Structured Corrective Exercise Program

Behavioral

The corrective exercise program was implemented 3 times per week for 8 weeks during the in-season period. The protocol focused on optimizing lower extremity alignment, improving neuromuscular control, and correcting faulty jump-landing patterns. Key components included exercises targeting body segment alignment, specific drills to reduce the Q angle, and neuromuscular training to enhance Landing Error Scoring System (LESS) scores. All sessions were integrated into the athletes' regular volleyball training schedule to ensure proper kinetic chain integration and injury risk mitigation.

Primary outcomes

  1. Static Q Angle

    Time frame: Baseline and at the end of the 8-week intervention.

    The measurement of the angle between the quadriceps muscle and the patellar tendon to assess lower extremity alignment.

  2. Landing Error Scoring System (LESS) Score

    Time frame: Baseline and post-intervention (8 weeks).

    A clinical tool used to assess jump-landing mechanics through video analysis.

  3. Countermovement Jump (CMJ) Height

    Time frame: Baseline and post-intervention (8 weeks).

    Measurement of vertical jump height to evaluate explosive power.

Sponsors and collaborators

Lead sponsor

Istanbul Gelisim University

Other

Registry information

Official study title

The Effect of Corrective Exercises on Q Angle, Balance, and Jump-Landing Mechanics in Female Volleyball Players

Important dates

Study start
2023
Primary completion
2024
Study completion
2024
First posted
May 11, 2026
Registry last updated
May 11, 2026

OpenTrials presents study information sourced from ClinicalTrials.gov. The official registry record should be consulted for the latest information.

View the official ClinicalTrials.gov record (opens in a new tab)

This listing is for discovery and informational purposes only. It is not medical advice, does not guarantee that a study is recruiting, and does not determine eligibility. Contact the study team and a qualified healthcare professional when considering participation.

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