Bernstein Medical Center for Hair Restoration - Number of Grafts Per Hair Transplant

Number of Grafts Per Hair Transplant

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Q: Is it safe to implant 6,000 grafts in 2 days with an FUE procedure? — L.P. ~ Port Washington, N.Y.

A: A 6,000-graft procedure would be a very large hair transplant. Transplanting this many grafts at once would necessitate grafts being placed very close together. In this situation, the blood supply may not be adequate to support the growth of the newly transplanted grafts.

Another reason for concern is that when harvesting, FUE yields about 20 grafts/cm2. A 6,000-graft procedure would require 300 cm2. Since the donor area is about 30 cm long, this would require a donor height of 10 cm, clearly extending beyond the permanent zone of the scalp of most patients.

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Q: How many follicles can you transplant with robotic FUE compared to manual FUE? — R.V., Upper West Side, N.Y.

A: We can extract the same number of follicles robotically as we can manually.

That said, the goal of any hair transplant procedure is not to transplant as many hair follicles as possible but rather to achieve the best possible cosmetic result given your degree of hair loss and the number of hair follicles available in your donor area.

While there is no difference between robotic and manual FUE in terms of the number of follicles that each procedure can extract, robotic FUE does have the following advantages over manual FUE:

  • During the follicular unit extraction (or harvesting) phase of a hair transplant, there is less chance of damaging follicular units using a robot vs. a hand held device (e.g., Neograft), because the robot is more accurate. This means more grafts survive after transplant.
  • Robotic graft harvesting times are shorter than manual, e.g., while on average if a physician could manually extract 200-300 grafts per hour, the same physician could robotically extract up to 500-1000 grafts per hour ((Chang, H.H. Robotics, artificial intelligence, and the future of hair transplantation. Prime Dermatology, July/August 2014.)). This means a shorter procedure time for the patient.

Read more about the advantages of Robotic FUE.

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Q: I had a follicular unit hair transplant performed by another doctor that was scheduled for 2,500 grafts and I ended up paying for exactly that amount. I was supposed to be paying per graft, so it seems strange that it came out to be exactly 2,500? How do I know what I really got? — J.R., Westport, C.T.

A: This is a question that should be addressed to the doctor that operated on you.

If a doctor is charging by the graft, then you should know exactly how many grafts you are receiving. It is possible that he/she hit the number (2500) exactly on the head, but statistically that is extremely unlikely. In a Follicular Unit Hair Transplant (FUT) procedure, a strip is removed from the donor area and then dissected into individual follicular units, so although an experienced surgeon can remove a strip that contains close to the desired number of follicular units, it would be very rare to hit that number precisely.

More importantly, it is impossible to perform follicular unit transplantation properly without knowing both the exact number of follicular units harvested from the donor area and the exact number of hairs in each unit (i.e. the number of 1-, 2-, 3-, and 4-hair follicular unit grafts). This information is essential in determining both the distribution and density of the hair transplant and in creating transitional zones such as the frontal hairline, where single-hair follicular units are required.

In all hair transplants, the number of grafts harvested should equal the number of recipient sites, so the doctor must know the exact number of grafts so that he can make the appropriate number of recipient sites. An exception to this rule is the stick and place technique, where each graft is inserted as soon as the site is made, but this technique is much less common than first making the recipient sites. The surgeon also needs to know the number of grafts so that he can make the sites in the appropriate distribution. For example, if the number of grafts harvested was less than anticipated, the doctor can space the sites further apart, cover less of an area (for example, not extend the restoration as far back into the crown) or harvest additional donor tissue – each option having advantages and disadvantages.

It is equally important to know the exact composition of follicular units, so that different densities can be created in different areas, producing the most natural appearance. For example, the 3- and 4- hair follicular units should be placed in the central forelock area as this area normally has the most density. On the other hand, if these larger units are placed near the hairline, they will look distinctly unnatural.

So how can the patient really know? Obviously, trust in your doctor is the most important insurance. If you are skeptical about the way the doctor conducted the consult (i.e. used a salesman to encourage a sale), if he or she skipped over important options such as medication, or if you felt pressured or rushed into making a decision to have surgery; you should be skeptical about other aspects of your care as well – such as an accurate graft count.

Although just a very general guide, here are some things you can do at your consult when trying to decide if a doctor can be trusted to give you accurate information regarding the number of grafts you receive.

  1. Ask to see the operating room – see if there are plenty of microscopes (the larger the session, the more are needed).
  2. Ask the doctor how he keeps count of the grafts that are dissected and how does he record how many hairs in each follicular unit graft.
  3. Ask the doctor how he keeps track of the number of recipient sites that are made.
  4. Ask to see how all this information is documented in the patient’s medical record.
  5. Ask the doctor if he refunds money to the patient if he transplants less grafts than scheduled.
  6. Speak with other staff members to confirm the use of dissecting microscopes for the entire surgery and confirm the procedure for tracking grafts.

In sum, knowing the exact number of grafts and their composition is extremely important, not only to ensure that you are being charged fairly, but in maximizing the aesthetic results of your follicular unit transplant procedure.

Be certain that this information will be available to you (and of course your surgeon) before scheduling a procedure.

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Q: I have seen some incredible photos on some websites. In some cases, they seem too good to be true. Are they real? — P.V., Jersey City, N.J.

A: Evaluating results is more complicated than simply looking at photos – even if they are un-retouched and not studio shots.

For example, if 4,000 grafts were used to make a young person’s hair line look very dense, you might say that was a spectacular result. However, if he only has a total of 6,000 follicular units in his donor area (the average), then he is going to have many problems as he continues to bald, since there will be only 2,000 grafts left for the rest of his head.

Not only was too much hair used up in the front, but the high density of the frontal hair line will not look balanced as the person ages, as this density can not be sustained.

Similar problems occur when the frontal hairline is placed too low or is too broad. These look great in photos early on – and are great for marketing purposes – but become real problems as the person ages.

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Q: Some surgeons are doing hair transplants using 5,000 to 6,000 grafts in a single surgery. Looking at the cases in your photo gallery, it seems like your hair transplants involve many fewer grafts per surgery. Do you do such large graft numbers in a single hair restoration procedure? — H.P., Cranston, R.I.

A: The goal in surgical hair restoration should be to achieve the best results using the least amount of donor hair (the patient’s permanent reserves) and not simply to transplant the most grafts in one session. In my opinion, although large sessions are very desirable, the recent obsession with extremely large numbers of grafts in one session is misplaced. The focus should be on results.

For example, I would prefer to have full growth with a properly placed 2,500 – 3,000 graft hair transplant session than partial growth in a 5,000 graft session. Of course, the 5,000 graft session will look fuller than 2,500 grafts but, in my experience, never twice as full, and never as full as two 2,500 graft sessions.

The ability to perform large sessions is possible because of the very small recipient sites needed in Follicular Unit Transplantation (FUT). It is one of the main reasons that we developed this procedure in back in 1995. See the first paper on this subject: Follicular Transplantation.

However, like all good things, the technique loses some of its advantage when taken to extreme.

In “very” large sessions, the long duration of surgery, the increased time the grafts are outside the body, the increased amount of scalp wounding, risk of poor growth, wider donor scars, placing grafts where they are not needed, sub-dividing follicular units, and the decreased ability to plan for future hair loss, can all contribute to suboptimal results. These problems don’t always occur, but the larger the session, the greater the risk. Therefore, it is important to decide if one’s goal is simply to transplant the maximum amount of hair that is possible in one session, or to get the best long-term results from your hair restoration.

Follicular Unit Preservation

One of the most fundamental issues is that doctors using very large sessions are not always performing “Follicular Unit Transplantation” and, therefore, in these situations the patients will not achieve the full benefit of the FUT procedure. Although doctors who perform these very large sessions take the liberty of calling their surgery “Follicular Unit Transplantation,” in actuality it is not, since naturally occurring follicular units are not always kept whole. The procedure is defined as follows: “Follicular Unit Transplantation is a method of hair restoration surgery where hair is transplanted exclusively in its naturally occurring, individual follicular units.” (see Hair Transplant Classification)

By preserving follicular units, FUT maximizes the cosmetic impact of the surgery by using the full complement of 1 to 4-hairs contained in naturally occurring follicular units. A whole follicular unit will obviously contain more hair than a partial one and will give the most fullness. Keeping follicular units whole also insures maximal growth since a divided follicular unit loses its protective sheath and risks being damaged in the dissection.

It can sound impressive to claim that you performing very large hair transplants, but if the large numbers of grafts are a result dividing up follicular units, then the patient is being short-changed. The reason is that, although the number of grafts is increased, the total number of hairs transplanted is not. A 3-hair follicular unit that is split up into a 1-hair and 2-hair micro-graft will double the graft count, but not change the total number of hairs actually transplanted. In fact, due to the increased dissection, more fragile grafts, and all the other potential problems associated with very long hair transplant sessions, the total number of hairs that actually grow may be a lot less. Please look at the section “Limits to Large Hair Transplant Sessions” on the Graft Numbers page of the Bernstein Medical – Center for Hair Restoration website for a more detailed explanation of how breaking up follicular units can affect graft counts.

Donor Scarring

Since there are around 90 follicular units per cm2 in the donor scalp, one needs a 1cm wide by 28cm long (11inch) incision to harvest 2,500 follicular units. A 5,000 follicular unit procedure, using this width, would need to be 22 inches long, but the maximum length one can harvest a strip in the average individual is 13 inches (the distance around the entire scalp from one temple to the other).

In order to harvest 5,000 grafts, one would need 5,000 / 90 FU/cm2 = 55.6cm2 of donor tissue. If one takes the full 13 inch strip (33cm), then it would need to be 1.85 cm wide (55.6cm2 / (33cm long) = 1.85cm wide) or 1.85/2.54= ¾ of an inch wide along its entire length. However, one must taper the ends of a strip this wide (you can’t suture closed a rectangle) and, in addition, you can’t take such a wide strip over the ears. When you do the math again, it turns out that for most of the incision, the width must be almost an inch wide, an incredibly large amount of tissue to be removed in one procedure.

This large incision obviously increases the risk of having a wide donor scar – probably the most undesirable complication of a hair transplant. Needless to say, very large graft counts are achieved by sub-dividing follicular units rather than exposing the patient to the risk of an excessively large donor incision.

Popping

There are other issues as well. Large sessions go hand-in-hand with very high graft densities, since you often need these densities to fit the grafts in a finite area. The closer grafts are placed together, the greater the degree of popping. Popping occurs when a graft that is placed in the skin causes an adjacent one to lift-up. When a graft pops (elevates above the surface of the skin) it tends to dry out and die. Some degree of popping is a normal part of most hair transplant procedures and can be easily controlled by a skilled surgical team, but when it is excessive it can pose a significant risk to graft survival.

The best way to decrease the risk of popping being a significant problem is to not push large sessions (and the associated very dense packing) to the limit. In a patient’s first hair restoration procedure, it is literally impossible to predict the likelihood of excessive popping and once a very large strip is harvested, or the recipient sites are created in a very large session, it may be too late to correct for this. In addition, popping can vary at different times during the procedure and in different parts of the scalp adding to the problem of anticipating its occurrence.

Even if the distribution of grafts is well planned from the outset, a very large first session may force the surgeon to place hair in less-than-optimal regions of the scalp when popping occurs. This is because the surgeon must distribute the grafts further apart and thus over a larger area to prevent popping.

Blood Flow

Particularly where there is long-standing hair loss, the blood flow to the scalp has decreased making the scalp unable to support a very large number of grafts. This is not the cause of the hair loss, but the result of a decreased need for blood when the follicles have disappeared. In addition, persons that have been bald for a long time often have more sun damage on their scalp, a second factor that significantly compromises the scalp’s blood supply and may compromise the follicles survival when too many grafts are placed in one session. As with popping, the extent of photo-damage, as seen when the scalp gets a dusky-purple color during the creating of recipient sites, often only becomes evident once the procedure is well under way.

In the healing process following the first hair transplant, much of the original blood supply returns and this makes the scalp able to support additional grafts (this is particularly true if one waits a minimum of 8-10 months between procedures). This is another reason why it is better to not to be too aggressive in a first session when there is long-standing baldness or significant photo damage and where the blood supply may be compromised.

Limited Donor Supply

Another issue that is overlooked in performing a very large first session is that the average person only has about 6,000 movable follicular units in the donor area. When 5,000 grafts are used for the 1st procedure there will be little left for subsequent sessions and limit the ability of the surgeon to increase density in areas such as the frontal forelock or transplant into new areas when there is additional hair loss.

Conclusion

There are many advantages of performing large hair transplants, including having a natural look after one procedure, minimizing the number of times the donor area is accessed, and accomplishing the patient’s goals as quickly as possible. However, one should be cautious not to achieve this at the expense of a wider donor scar, poor graft growth, or a compromised ability to plan for future hair loss.

Achieving very high graft numbers should never be accomplished by dividing up the naturally occurring follicular units into smaller groups, as this increases the risk to the grafts, extends the duration of surgery, increases the cost of the procedure (when charging by the graft) and results in an overall thinner look.

For further discussion see:

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Q: Can you give me an idea of the average width of a donor strip, i.e. the actual width taken from the back of your scalp for a hair transplant? — A.E., Fort Lee, N.J.

A: The average donor strip is 1cm wide, although this will vary depending on the patient’s scalp laxity, density, and the number of grafts desired for the hair restoration.

The length also depends on the number of grafts needed. We average 90-100 follicular unit grafts per cm2 of donor tissue (that is the density of follicular units in an average person).

A 2,000 graft procedure, for example, would require a donor strip 22 cm long and 1cm wide. A 2,500 graft session would be 1.2 cm wide and 23 cm long.

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Q: Hair transplantation sounds like a really time-consuming procedure. How long does the hair transplant actually take? — S.M., Hell’s Kitchen, N.Y.

A: An average hair transplant, that involves the movement of 1,500 to 2,500 grafts, can take a team of up to six people, five to eight hours.

Surgical hair restoration is a very time-consuming, labor intensive process, where every aspect of the surgery must be precisely controlled to get maximum growth and an optimum cosmetic result.

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Q: I am interested in an FUT hair transplant. How do you figure out how large a strip to use for the hair restoration when transplanting all follicular units? — P.K., New York City, N.Y.

A: The length of the donor strip incision is determined by the number of follicular unit grafts required for the hair restoration. There are slightly less than 100 follicular units/cm2, so if a 1cm wide strip is used, a hair restoration procedure requiring 1800 grafts would need a strip that measured slightly more than 18cm in length.

A 2800 graft procedure would measure slightly more that 24cm if the strip were 1.2cm wide.

The width of the strip is determined by scalp looseness or laxity. For more information, please see the page on the Donor Area.

Read more about FUT hair transplant procedures

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Q: There is such a big deal made on the chats about people getting Megasessions of over 4000 grafts per session. When I look at the pictures on your website, the results look great, but I am surprised that not many grafts were used compared to what is being talked about. — N.R., Poughkeepsie, N.Y.

A: My goal is not to transplant as many grafts as possible, but to get the best results possible without exhausting a person’s donor supply. It is important to keep reserves for future hair loss. Unnecessarily large sessions also risk poor growth and have a greater incidence of donor scarring.

View Before and After Hair Transplant Photos

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Q: Is it possible to tell me roughly how many grafts would be left from donor area if one had a hair transplant of 2,500 grafts and had a density of around 2.0? G.H. – New York, NY

A: How much hair can be harvested in total depends upon a number of factors besides donor density. These include: scalp laxity, hair characteristics (such as hair shaft diameter, color and wave), and the actual dimensions of the permanent zone.

Every person is different, so all of these factors would need to be taken into account to determine the total number of grafts that would be available for the hair restoration.

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Q: If I had a hair transplant using Follicular Unit Transplantation, how many grafts would be in a 15cm by 1cm donor strip, on average? — J.A. Point Pleasant, N.J.

A: In a person with average donor density there are approximately 100 follicular units per square centimeter. A 15cm long strip would have slightly less than 1500 grafts due to the tapering of the strip ends.

Therefore, in a hair transplant of 1500 follicular unit grafts, one should take out a 17 cm x 1cm strip (that includes the tapered ends). This is 15cm2.

Read about the number of grafts in a hair transplant

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Follicular Unit Transplantation - Dermatologic Clinics“Dermatologic Clinics” is a quarterly review with comprehensive, state-of-the-art information by experts in the field of dermatology. The industries most highly knowledgeable medical professionals provide current, practical information on the diagnosis and treatment of conditions affecting the skin. Each issue of Dermatologic Clinics focuses on a single topic. The July 2005 issue, entitled “Advanced Cosmetic Surgery”, published an article authored by Robert M. Bernstein M.D, and co-authored by William R. Rassman M.D. entitled “Follicular Unit Transplantation: 2005.”

In their article on FUT, the authors helped the dermatologic community to better understand the best practices of surgical hair restoration. Follicular Unit Transplantation (FUT) focuses on recognizing that the follicular unit is a discrete, anatomic and physiologic entity, and that preserving it through stereomicroscopic dissection is the best way to ensure the natural appearance of the hair restoration. Dr. Bernstein explains why this major step has brought hair transplantation into the twenty-first century.

This chapter also points out that the issues yet to be resolved in hair transplantation include determining the maximum density and number of grafts that can be used safely in a single session, deciding whether it is preferable to pre-make recipient sites or immediately place grafts into sites as they are made, and defining the precise role of Follicular Unit Extraction (FUE).

The authors conclude by stressing that the essence of providing the best care for hair transplant patients rests on proper patient selection, establishing realistic expectations, and using non-surgical management for young persons who are just starting to thin. When surgery is indicated, Follicular Unit Hair Transplantation is the ideal hair restoration procedure.

Read the publication Follicular Unit Transplantation: 2005

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