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

May 5, 2026 updated by: Istanbul Gelisim University

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

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.

Study Overview

Status

Completed

Conditions

Intervention / Treatment

Detailed Description

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.

Study Type

Interventional

Enrollment (Actual)

23

Phase

  • Not Applicable

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Locations

  • Turkey (Türkiye)
      • Istanbul, Turkey (Türkiye), 34310
        • Istanbul Gelisim University, Faculty of Sport Sciences

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Ages Eligible for Study

  • Child

Accepts Healthy Volunteers

Yes

Description

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.

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

  • Primary Purpose: Prevention
  • Allocation: Randomized
  • Interventional Model: Parallel Assignment
  • Masking: None (Open Label)

Arms and Interventions

Participant Group / Arm
Intervention / Treatment
Experimental: Experimental Group
Young female volleyball players (n=12) who participated in an 8-week structured corrective exercise program during the in-season period, in addition to their standard volleyball training
Behavioral: Structured Corrective Exercise Program
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.
No Intervention: Control Group
Young female volleyball players (n=11) who continued their standard volleyball training during the 8-week study period without participating in any corrective exercise protocol.

What is the study measuring?

Primary Outcome Measures

Outcome Measure
Measure Description
Time Frame
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.
Baseline and at the end of the 8-week intervention.
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.
Baseline and post-intervention (8 weeks).
Countermovement Jump (CMJ) Height
Time Frame: Baseline and post-intervention (8 weeks).
Measurement of vertical jump height to evaluate explosive power.
Baseline and post-intervention (8 weeks).

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

Istanbul Gelisim University

Investigators

  • Principal Investigator: Burak Taş, PhD, İstanbul Gelisim University

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start (Actual)

February 20, 2023

Primary Completion (Actual)

May 10, 2024

Study Completion (Actual)

June 15, 2024

Study Registration Dates

First Submitted

May 5, 2026

First Submitted That Met QC Criteria

May 5, 2026

First Posted (Actual)

May 11, 2026

Study Record Updates

Last Update Posted (Actual)

May 11, 2026

Last Update Submitted That Met QC Criteria

May 5, 2026

Last Verified

May 1, 2026

More Information

Terms related to this study

Keywords

Additional Relevant MeSH Terms

Other Study ID Numbers

  • GOKAEK-2022/21.16

Plan for Individual participant data (IPD)

Plan to Share Individual Participant Data (IPD)?

YES

IPD Plan Description

Individual participant data that underlie the results reported in this article, after de-identification, will be available from the corresponding author on reasonable request.

IPD Sharing Time Frame

Data will be available beginning 6 months after publication and ending 3 years after publication.

IPD Sharing Access Criteria

De-identified individual participant data will be available to researchers who provide a methodologically sound proposal for use in achieving the goals of the approved proposal. Proposals should be directed to btas@gelisim.edu.tr. To gain access, data requestors will need to sign a data access agreement.

IPD Sharing Supporting Information Type

  • STUDY_PROTOCOL
  • SAP
  • ICF

Drug and device information, study documents

Studies a U.S. FDA-regulated drug product

No

Studies a U.S. FDA-regulated device product

No

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

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