Clinical Trials Logo

Clinical Trial Summary

Quadriceps muscle strength is one of the key determinants for patients to fulfill the Return-to-Play (RTP) criteria after an anterior cruciate ligament reconstruction (ACLR), in which the muscle size is directly linked to muscle strength. Quadriceps muscle atrophy is unavoidable after ACLR, but the rehabilitation program should increase quadriceps muscle mass. However, despite good rehabilitation compliance, some patient's progress is sub-par and fail to regain muscle mass. Quadriceps muscle atrophy can persist beyond the completion of the rehabilitation program in almost half the patients and the reason behind this is still unknown. This represents an area that requires significant investigation, as quadriceps muscle atrophy and weakness have been shown to be determinants of poor knee function, decreased performance in sports and increased risk of reinjury. Quadriceps muscle atrophy after ACLR is well documented. This can be due to a decreased ability to regain muscle mass with rehabilitation. Athletes are one of the high-risk groups for vitamin D insufficiencies. Vitamin D deficiency can potentially result in decreased hypertrophy when exercising the muscle, leading to a poorer outcome in rehabilitation. Vitamin D has long been recognized for its effect on musculoskeletal health. It can have a direct effect on muscle hypertrophy by acting on specific vitamin D receptors (VDRs) on myocytes, and sufficient or increased levels of vitamin D in patients have been found to correlate with an increase in the size, number, and strength of muscle fibres. Quadriceps muscle hypertrophy after ACLR is triggered by exercise training, facilitated by diet and a number of intrinsic factors. As the rehabilitation programs and diets are similar in patients with varying extents of quadriceps muscle atrophy, individual responses (intrinsic factors) to exercise training may account for the resulting persistent quadriceps muscle atrophy. In this study, the investigators hypothesize that the deficiency of vitamin D may contribute to persistent quadriceps atrophy and weakness. With a stringent double-blinded randomized-controlled-trial (RCT) research design, our proposal will then address the research questions: 'Does vitamin D supplements improve the vitamin D deficiency status in patients after ACL reconstruction?', and 'Does vitamin D supplements improve quadriceps muscle strength for patients after ACLR?'


Clinical Trial Description

n/a


Study Design


Related Conditions & MeSH terms


NCT number NCT05174611
Study type Interventional
Source Chinese University of Hong Kong
Contact Michael Tim-Yun Ong
Phone 26364171
Email michael.ong@cuhk.edu.hk
Status Recruiting
Phase Phase 2
Start date March 19, 2021
Completion date September 1, 2025

See also
  Status Clinical Trial Phase
Recruiting NCT04062578 - Effects Provided by a Physiotherapy Treatment Preventing Lower Extremity Injuries in Female Football Players N/A
Recruiting NCT05461326 - Quadriceps Tendon Versus Bone Patellar Tendon Bone Autograft ACL Reconstruction RCT N/A
Completed NCT05109871 - Reliability and Validity of Inline Dynamometry Study for Measuring Knee Extensor Torque N/A
Completed NCT05504018 - Clinical and Radiological Evaluation of ACL Reconstruction Results N/A
Recruiting NCT06185231 - Investigation of the Effects of Vibration Therapy on Pain, Functionality, and Proprioception After ACL Injury N/A
Recruiting NCT03968913 - Biologic Therapy to Prevent Osteoarthritis After ACL Injury Early Phase 1
Completed NCT04408690 - Feasibility of a RCT That Compares Immediate Versus Optional Delayed Surgical Repair After ACL Injury Phase 3
Recruiting NCT06222814 - Evaluation of the Results of Two Different Methods in Management of Antero-lateral Instability of the Knee N/A
Recruiting NCT05614297 - Agreement Between Rolimeter and Lachmeter in Patients With ACL Injury
Active, not recruiting NCT05184023 - The Effect of PEMF for Patients With Quadriceps Muscle Weakness After ACLR N/A
Completed NCT04906538 - Objective Results of Anterior Cruciate Ligament Reconstruction With and Without Internal Suture Augmentation Technique Phase 2/Phase 3
Completed NCT05014009 - The Influence of Neuromuscular Training on Whole-body Movement Strategies and Knee Mechanics During Change-of-direction Tasks in Sports Science Students N/A
Not yet recruiting NCT06083818 - Anterior Cruciate Ligament Injury Prevention Protocol in Female Football Players With Dynamic Knee Valgus N/A
Recruiting NCT05584020 - Arthroscopic Anterior Cruciate Ligament Repair Versus Reconstruction for Acute Anterior Cruciate Ligament Injury N/A
Completed NCT04580290 - Jewel ACL Post Market Clinical Follow Up Study
Recruiting NCT04888052 - Prolonged Preoperative Rehabilitation in ACL Rupture. N/A
Recruiting NCT06430775 - Exploring Prolonged AMR in ACL Reconstructed Patients
Not yet recruiting NCT05580133 - All-Inside Single-Bundle for Anterior Cruciate Ligament Reconstruction With Full Thickness of the Peroneus Longus Tendon Compared to the Six-strand-hamstring Autograft (ACL)
Recruiting NCT04162613 - Can Sensorimotor Function Predict Graft Rupture After ACL Reconstruction
Not yet recruiting NCT05619393 - Comparison of Kinematic Movements Between ACL Deficiency With ACL Reconstruction and Healthy People N/A