top of page

Direct Hair Implantation (DHI)

Direct Hair Implantation (DHI) stands at the forefront of advancements in hair transplantation, offering a specialized and innovative technique for restoring natural hair growth.

This comprehensive article will delve into the intricacies of DHI, exploring its definition, procedure, unique aspects, considerations, advantages, and potential drawbacks. 

What is Direct Hair Implantation (DHI)? 

Direct Hair Implantation (DHI) is an advanced method of hair transplantation that distinguishes itself by its precision and efficiency in the placement of hair follicles. This technique is an evolution of the Follicular Unit Extraction (FUE) approach, refining the process to achieve a more natural-looking and seamlessly integrated result. 

The DHI Procedure 

1- Extraction of Hair Follicles: 

The DHI procedure begins with the extraction of individual hair follicles from the donor site, usually the back or sides of the scalp. This extraction is done using a specialized tool with a diameter of less than 1 mm, minimizing trauma to the donor area. 

Direct Hair Implantation (DHI) is an advanced method of hair transplantation that distinguishes itself by its precision and efficiency in the placement of hair follicles.
Direct Hair Implantation

2- Preparation of Grafts: 

The extracted follicles are then carefully prepared for implantation. Unlike traditional methods where graft preparation occurs outside the body, DHI allows for immediate graft preparation during the procedure. 

3- Implantation Using Choi Pen: 

The hallmark of DHI is the use of a Choi Implanter Pen, a specialized device that allows for precise control over the depth, direction, and angle of hair follicle implantation. The pen has a hollow needle that holds the graft and facilitates its direct placement into the recipient site. 

4- Single-Step Implantation: 

One of the distinctive features of DHI is its single-step implantation process. The Choi Pen both creates the recipient site and implants the graft in one continuous motion, ensuring minimal handling of the follicles and reducing the time they spend outside the body. 

Unique Aspects of DHI 

1- Precision and Control: 

DHI provides unparalleled precision in the implantation process. The Choi Pen allows the surgeon to control the angle, depth, and direction of each graft, resulting in a natural and aesthetically pleasing hairline.

2- No Need for Channel-Cutting: 

Unlike other techniques where channels are pre-cut before implantation, DHI's Choi Pen eliminates the need for channel-cutting. This reduces tissue trauma, promotes faster healing, and minimizes scarring. 

3- Immediate Graft Placement: 

The immediate placement of grafts ensures their vitality and increases the likelihood of successful transplantation. The grafts are not exposed to external conditions for an extended period. 

4- Efficiency in Large-Scale Transplants: 

DHI is well-suited for large-scale hair transplants, as the efficiency of the Choi Pen allows for a higher number of grafts to be implanted in a single session. 

Considerations Before DHI 

1- Candidate Evaluation: 

Patient suitability is assessed based on factors such as the extent of hair loss, donor site quality, and overall health. DHI is generally suitable for individuals with various degrees of hair loss. 

2- Expectations and Goals: 

Clear communication between the patient and the surgeon is crucial to align expectations and set realistic goals for the outcome of the DHI procedure. 

3- Donor Site Assessment: 

The quality and density of the donor site are assessed to determine the feasibility of extracting a sufficient number of grafts for transplantation. 

Advantages of DHI 

1- Natural-Looking Results: 

DHI's precision in graft placement results in a natural and undetectable hairline. The angle and direction of hair growth closely mimic the patient's original hair pattern. 

2- Faster Healing: 

The minimally invasive nature of DHI, with no channel-cutting required, contributes to faster healing and reduced postoperative discomfort. 

3- Reduced Handling of Grafts: 

DHI's single-step implantation process reduces the time grafts spend outside the body, minimizing the risk of graft damage and improving their overall survival rate. 

4- No Visible Scarring: 

The absence of channel-cutting in DHI reduces scarring in the recipient site, providing a more aesthetically pleasing outcome. 

Drawbacks and Considerations 

1- Cost: 

DHI can be more expensive compared to traditional hair transplantation methods due to the specialized equipment and expertise required. 

2- Learning Curve: 

DHI requires specialized training, and surgeons need to be proficient in using the Choi Pen. As a result, there may be a limited number of experienced DHI practitioners. 

3- Graft Survival Rate: 

While DHI aims to maximize graft survival, the success of the procedure is also contingent on the patient's adherence to postoperative care instructions. 


Direct Hair Implantation represents a significant leap forward in the field of hair transplantation, offering a meticulous and innovative approach to achieving natural-looking results. As with any surgical procedure, it is essential for individuals considering DHI to consult with experienced and qualified surgeons, discuss expectations thoroughly, and make informed decisions based on their unique circumstances.

0 views0 comments
bottom of page