Basic Study Open Access
Copyright ©The Author(s) 2018. Published by Baishideng Publishing Group Inc. All rights reserved.
World J Orthop. Feb 18, 2018; 9(2): 7-13
Published online Feb 18, 2018. doi: 10.5312/wjo.v9.i2.7
Optimal surgical approach for the treatment of Quervains disease: A surgical-anatomical study
Alexander R Poublon, Gert-Jan Kleinrensink, Department of Neuroscience and Anatomy, Erasmus MC, Rotterdam, Zuid-Holland 3000 CA, Netherlands
Anton LA Kerver, Department of Plastic and Reconstructive surgery, Catharina Ziekenhuis, Eindhoven, Noord-Brabant 5623 EJ, Netherlands
J Henk Coert, Department of Plastic Surgery, UMC Utrecht, Utrecht, Utrecht 3584 CX, Netherlands
Erik T Walbeehm, Department of Plastic Surgery, Radboud UMC, Gelderland, Nijmegen 6500 HB, Netherlands
ORCID number: Alexander R Poublon (0000-0001-8326-4869); Gert-jan Kleinrensink (0000-0002-9073-3181); Anton LA Kerver (0000-0002-1534-1399); J Henk Coert (0000-0002-1921-9737); Erik T Walbeehm (0000-0002-5319-2224).
Author contributions: Poublon AR and Kerver ALA performed the research, did the experiments and wrote the paper; Kleinrensink GJ, Coert JH and Walbeehm ET helped with study design and writing of the paper.
Institutional review board statement: As this is a cadaveric study, no institutional review board statement is required.
Conflict-of-interest statement: The authors have no conflict of interest to declare.
Data sharing statement: No additional date was available.
Open-Access: This article is an open-access article which was selected by an in-house editor and fully peer-reviewed by external reviewers. It is distributed in accordance with the Creative Commons Attribution Non Commercial (CC BY-NC 4.0) license, which permits others to distribute, remix, adapt, build upon this work non-commercially, and license their derivative works on different terms, provided the original work is properly cited and the use is non-commercial. See: http://creativecommons.org/licenses/by-nc/4.0/
Correspondence to: Alexander R Poublon, MD, Academic Research, Department of Neuroscience and Anatomy, Erasmus MC, Postbus 2040, Rotterdam, Zuid-Holland 3000 CA, Netherlands. a.poublon@erasmusmc.nl
Telephone: +31-62-8426599 Fax: +31-10-7043257
Received: September 7, 2017
Peer-review started: September 24, 2017
First decision: November 6, 2017
Revised: January 6, 2018
Accepted: January 23, 2018
Article in press: January 23, 2018
Published online: February 18, 2018

Abstract
AIM

To determine which of the common used incision techniques has the lowest chance of iatrogenic damage to the nerves which at risk are the superficial branch of the radial nerve (SBRN) and the Lateral Antebrachial Cutaneous Nerve (LABCN).

METHODS

Twenty embalmed arms were dissected and the course of the SBRN and the LABCN in each individual arm was marked and the distance between the two branches of the SBRN at the location of the First Extensor Compartment (FEC) was measured. This data was used as input in a visualization tool called Computer Assisted Anatomy Mapping (CASAM) to map the course of the nerves in each individual arm.

RESULTS

This image visualizes that in 90% of the arms, one branch of the SBRN crosses the FEC and one branch runs volar to the compartment. The distance between the two branches was 7.8 mm at the beginning of the FEC and 10.2 mm at the end. Finally the angle of incision at which the chance of damage to the nerves is lowest, is 19.4 degrees volar to the radius.

CONCLUSION

CASAM shows the complexity of the course of the SBRN over the FEC. None of the four widely used incision techniques has a significantly lower chance of iatrogenic nerve damage. Surgical skills are paramount to prevent iatrogenic nerve damage.

Key Words: De Quervain’s tenosynovitis, First dorsal compartment release, Wrist surgery

Core tip: Although many incision techniques can be found in literature no consensus on the best incision technique has been established. The study shows a large variation in the course of the superficial branch of the radial nerve over the first extensor compartment. However no complete safe zone can be defined. The choice of incision remains surgeons’ preference and surgical skills are paramount to prevent iatrogenic nerve damage.



INTRODUCTION

A study regarding de Quervains disease (QD) performed in the UK showed a prevalence of 0.5% in men and 1.3% in women[1]. The study also showed a higher prevalence in workers and black people. Since its first description in 1895 by Fritz de Quervain, various treatment options have been described, varying from non-invasive techniques, such as splinting[2-7], to more invasive techniques such as injection[3,8-13] or even an operation one very debilitating complication after surgery for de Quervains disease, is nerve damage.

In previous studies four incision types have been suggested when applying surgical treatment: Transverse, longitudinal, lazy “s” or even specific angle technique. The transverse incision is designed to follow the lines of Langer and provide a superior cosmetic result[14,15]. The skin is incised transversely for 0.5 to 1 cm and the underlying tissue is bluntly dissected down to the extensor retinaculum overlying the first extensor compartment. The retinaculum is opened longitudinally and the first extensor compartment is released.

The longitudinal incision has been emphasized as being the safest incision[16,17]. The skin is incised longitudinally for 1.5 to 2 cm over the first extensor compartment and the underlying tissue is bluntly dissected down to the extensor retinaculum. The extensor retinaculum is opened longitudinally and the first extensor compartment is released.

The “lazy S” incision has been described[18]. The skin is incised with a stretched S over a length of 2 cm over the first extensor compartment. As with the other techniques, the underlying tissue is bluntly dissected down to the extensor retinaculum and the extensor retinaculum is opened longitudinally to release the first extensor compartment.

Another technique, is an incision under a specific angle as described[19]. Firstly a line is drawn down the mid-shaft of the first metacarpal and secondly a line is drawn perpendicular to the first line one finger width proximal to the base of the first metacarpal. From the intersection of these two lines, a 1-1.5 cm long incision is directed proximally and directed towards the ulna at a 30 to 45-degree angle.

However until now no consensus has been established on a “golden standard” for the incision type used for surgical treatment of the de Quervains Disease. The ideal incision should provide the best exposure with minimal scar tissue formation, a low recurrence rate and a minimal chance of iatrogenic damage to anatomical structures, i.e. the superficial nerves.

The structures most at risk in case of surgical treatment of QD are the SBRN and the Lateral Antebrachial Cutaneous Nerve (LABCN). The course of these nerves has been described in many previous studies (ref anatomy). The course of these nerves makes them very susceptible to iatrogenic damage. Some form of Superficial nerve damage has been estimated to occur in 0.5% to 30% of release[15,20-25].

As postulated in an earlier study[26], iatrogenic nerve damage to these nerves can lead do debilitating neuropathic pain symptoms[27].

The aim of this study is to identify, out of the four operative techniques described above, the technique with the lowest risk of iatrogenic damage to the nerve.

By using a new anatomical tool called Computer Assisted Anatomy Mapping (CASAM) it was possible to visualize statistics on the course of the nerves most at risk, such as the SBRN and LABCN.

CASAM is a tool that made it possible to visually map the course of the two branches of the SBRN and the course of the LABCN in each of the twenty arms that were dissected. By enlarging and/or reducing the size of all twenty individual visual images to the size of the average length of all twenty arms and then layering all individual images over each other, a visual image was created that represents the jointly course of the nerves in the average arm[28,29] (see the CASAM paragraph below).

This image, created by using CASAM, shows the complexity of the course and density of the nerves at risk in the operative area and thus providing a tool to evaluate the four incision techniques when operating.

MATERIALS AND METHODS

Twenty embalmed arms were dissected and the course of the SBRN and LABCN were identified and marked using colored pins. All arms [9 male, 11 female; mean age 79.35 (range 61-90); 15 Right, 5 Left] were embalmed using the anubifix embalming solution. The dissections were then performed under a magnifying loupe with a 2.5 times magnification.

Dissection

A standardized dissection technique was used. An incision was made from approximately 10 cm above the elbow down to the Metacarpo phalangeal (MCP) joint. At the proximal and distal end of the first incision, two perpendicular incisions were placed, by making these incisions a skin flap was created which could be removed laterally and medially. The Musculocutaneous Nerve was identified under the biceps and the LABCN was followed down to the MCP. At the distal 1/3 of the arm, the brachioradialis muscle was identified and bluntly dissected from the underlying tissue. The SBRN was found running under to the brachioradialis muscle (BR). Once the SBRN was found deep to the BR its course was followed to the muscle tendon transition from where the SBRN runs a superficial course. The SBRN was dissected distally to the Metacarpal joint and the nerve was identified using colored pins. After the SBRN was dissected down to the MCP the first extensor compartment was identified and the contour was marked using colored pins. Each arm was photographed with a Nikon D 60 with Sigma 50 mm 1:2.8 DG MACRO lens using a standardized setup[29]. The camera was positioned perpendicular to the specimen at a fixed distance and the arms were placed in specially designed clamps to ensure standard alignment.

Measurements

The width and length of the first extensor compartment was measured using digital calipers. Also, the distance between the first two branches of the SBRN was measured at 5 mm intervals. Finally, the angle was measured in which an incision would pose a minimal threat to the SBRN.

CASAM

Since the dissected arms vary in size, making comparisons is difficult. By using CASAM it is possible to compare digital images of all dissected arm directly by warping them to an average dimension.

CASAM is based on the fact that the bony landmarks, such as Lister’s tuberculum, are relatively constant in the same position in every arm. These are called “bony landmarks” (BL). From “bony landmarks” so called “shape defining landmarks” (SDL) were calculated, to mark the outline of each arm, by dividing the space between two BL’s into equal parts. The BL’s and SDL’s were used to define the shape of each arm and average locations for these landmarks were computed, thus creating an “average” arm. All arms were then warped to the dimensions of the “average” arm making is possible to compare all the arms directly. The “scaled” course of the SBRN and the LABCN of all individual arms could then be compared directly. In the near future, the data collected in the anatomical study will be stored in a database which is made accessible via the internet. Then, a digital picture of a patient can be uploaded and warped to the “average”arm of the CASAM database to predict the course of the SBRN making more precise, individual preoperative planning possible.

The “bony landmarks” and “shape defining landmarks”used in this study can be found in Figure 1 (green marks and blue marks). An image is then created of each arm with average dimensions of all specimen. This shows the average course of the SBRN.

Figure 1
Figure 1 Landmarks used to outline the arm. MCP: Metacarpo phalangeal.

The mean distance between a line through the lateral and medial epicondyle and Lister’s tuberculum, was 239.15 mm (range 209-281 mm), this distance was used as the reference length of the arm.

Photoshop procedure

The course of the SBRN and LABCN was traced using Photoshop CS4, furthermore the shape of the first extensor compartment was also traced in photoshop. These photoshop layers could then be compiled into one picture for further analysis.

The four incision types could then be superimposed on the database of nerves and the proximity to nerve fibers could be assessed.

The area between the first and second branch of the SBRN was defined and subsequently ‘filled’ with a color with 5% opacity. By compiling all 20 arms, an area could be defined in which the nerve was present in 5% of all cases and subsequently an area can be identified in which the nerve is present in 10% of cases etc. In this fashion a colored gradient map could be produced showing the 0 to 100% safe zone.

RESULTS

The first extensor compartment can be found at a distance of 8 mm proximal to Lister’s tuberculum and has a mean length of 26.6 mm (SD 5.3) and a mean width of 8.2 mm (SD 1.1). The mean angle between the first extensor compartment and the radius was 19.4° (SD 4.4). In all twenty specimens one or two branches of the SBRN ran across the first extensor compartment. The first branching of the SBRN was found 43.8 mm (SD 18.6) proximal to Lister’s tuberculum.

CASAM shows that in 90% of all cases one branch of the SBRN (SR 2) runs across the first extensor compartment in a longitudinal direction. Also, a second branch (SR 1) runs volar to the first extensor compartment (Figure 2). In the present 20 specimen, no complete safe zone (a zone in which no nerve fibers are present) could be identified near the first extensor compartment. However, the CASAM images (Figure 2) show that the direction of the SBRN over the first extensor compartment is at an angle of 19.4 degrees volar to the radius. Also one of the images created in CASAM shows a very small safe zone in which none of the nerves in the 20 specimen are present over the FEC (Figure 3).

Figure 2
Figure 2 Course of the superficial branch of the radial nerve compared to the first extensor compartment.
Figure 3
Figure 3 “Safe zone” gradient from red (95% nerve density) to green (0% nerve density).

The distance between the two branches of the SBRN crossing the first extensor compartment is 7.8 mm (SD 3.6) at the beginning of the first extensor compartment. 10.2 mm (SD 2.7) halfway down the first extensor compartment and 12.6mm (SD 2.7) at the end of the first extensor compartment (Figure 4). The branch running through the first extensor compartment divides in two more branches crossing the path of longitudinal path. The mean distance between the first branching point and the second is 43.5mm (SD 19.17), e.g., the maximum length of a longitudinal incision.

Figure 4
Figure 4 Distance between first and second branch of the superficial branch of the radial nerve for all 20 arms. SBRN: Superficial branch of the radial nerve.

During dissection it was not possible to follow the LABCN over the first extensor compartment because the nerve runs mostly intradermally. Furthermore, the course of the LABCN varies tremendously and no correlations between the courses of the LABCN could be found (Figure 5). No recommendation to prevent damage to the LABCN during Quervains disease surgery could be made. Therefore, the LABCN was left out. However as seen in earlier studies[26] the close relation between the LABCN and SBRN could be a major contributor to the cause of neuropathic pain in the distal wrist.

Figure 5
Figure 5 Course of 20 superficial branch of the radial nerve (Yellow) and 20 lateral antebrachial cutaneous nerve (Green) compared to the first extensor compartment.
DISCUSSION

Since the description of the first surgical treatment of Quervains disease, many surgeons have tried to perfect the operating technique and hence tried to minimize the complications. This study focusses on aspects of the incision. However, this treatment modality too has its complications. Recurrent tendovaginosis is a complication which occurs and often requires a second operation[30,31]. Also (iatrogenic) nerve damage is frequently seen, varying from neurapraxia to total transection of the nerve, are reported in literature[20,22-25].

The surgical treatment of Quervains disease is the treatment of choice after conservative measures have failed. To operate safely in the area of the dorso-radial part of the distal radius and the first metacarpus immediately introduces the problem of crossing and intertwining superficial branches of the radial nerve and the lateral cutaneous nerves (branches of the musculocutaneous nerve).

Three types of incisions are used to operate in this region; the transverse, the longitudinal and the “lazy S” type incision. Each of which has its advantages and disadvantages and no best practice (‘golden standard’) could be found in literature. In the present study an attempt is made to make an inventory of the course of the surgically relevant nerves related to the four incision types. Data was visualized using CASAM to give the surgeon concise information that allows him to make a choice between the four incisions.

Transverse incision technique

The transverse technique offers a good exposure while keeping the scar small and provides the best esthetic result[14,15]. Also because the skin incision is perpendicular to the first extensor compartment, contraction of scar tissue is less likely to cause compression of the first extensor compartment and thus is less likely to cause a recurrence of the symptoms of Quervains disease. However, the transverse direction of the skin incision implicates a high risk of iatrogenic nerve damage demonstrated by the images provided by CASAM (Figure 5). Furthermore, the distance between the two branches of the SBRN is 11.4 mm (0-26.3), therefore a transverse incision not only increases risk of injury to one branch but to the second branch as well.

Longitudinal incision technique

The longitudinal techniques offers more exposure than a transverse incision[16,17,32] with a lower chance of iatrogenic nerve damage[33]. However this technique offers a suboptimal cosmetic result and because the scar is directly over the first extensor compartment the retraction of scar tissue could cause compression of the first extensor compartment and recurrence of the symptoms of Quervains disease. The average length for the incision placed between the first two branches of the SBRN is 43.5 mm (SD 18.2). The nerve remains at risk due to its location over the first extensor compartment.

“Lazy S” incision technique

The “lazy S” technique has both advantages and disadvantages. The incision offers a good exposure and less chance of iatrogenic damage than the transverse incision[17,18]. However the scar as a result of this incision is not as cosmetic as the transverse incision and the incision has a greater chance of iatrogenic damage to the nerves than the longitudinal incision.

Specific angle technique

This technique offers a good exposure and minimizes the chance of iatrogenic damage to the nerve. It also offers a relatively cosmetically acceptable scar. However the determination of the angle of the incision takes time and is labor-intensive.

The technique described by[19] suggests a relatively acute angle to the radius which introduces a relatively high risk of damage to the SBRN. The present study shows that this risk can be significantly reduced by using a less acute angle.

The present study was performed using embalmed specimen which always means that the measurements cannot be extrapolated directly to the normal situation. However, since this concerns only relative measurements, the conclusions can be seen as representative. Furthermore by using Anubifix™ the shrinkage of tissue due to embalming is minimized and comparable to the fresh frozen specimen, the next best situation when compared with the in vivo situation.

Two- dimensional pictures are used in CASAM to warp the arms, but when operating the arm is a three-dimensional object. However, by taking the pictures in the same plane as the surgeon would use to make the incision, the third dimension is less relevant.

By using CASAM it was possible to virtually compare the incision techniques on the same arms. All techniques described above for the treatment of Quervains disease have their own advantages and disadvantages. The choice of which technique to use, depends on the priorities set by the surgeon. The main goal of this study was to identify the technique where iatrogenic damage to the SBRN is minimal. The conclusion that can be taken from the data is that despite the technique used, is that the retinaculum of the first dorsal compartment needs to be exposed by careful blunt dissection and divided under direct vision, so that the surgeon can see that the superficial nerves are not damaged. For beginning surgeons the longitudinal offers good exposure and less chance of iatrogenic nerve damage.

ARTICLE HIGHLIGHTS
Research background

Surgery is a widely applied as a treatment for the de Quervains Disease (QD). However, in 0.5 to 30% of cases, damage to the neurological structures have been reported this study was performed to try and provide a better understanding of the anatomy of the forearm to be able to decrease iatrogenic damage to the nerves of the forearm.

Research motivation

In this study the goal was to fins the optimal incision technique for the first dorsal compartment release for the Quervains disease. Up till now 4 main incision techniques have been described and no golden standard has been established. By using a new visualization technique the goal was to identify the best technique in order to prevent iatrogenic nerve damage during the first extensor compartment release procedure.

Research objectives

The goal of this study is to determine which of the common used incision techniques has the lowest chance of iatrogenic damage to the nerves. The nerves at risk are the superficial branch of the Radial Nerve (SBRN) and the Lateral Antebrachial Cutaneous Nerve (LABCN).

Research methods

20 anubifix embalmed arms were dissected in a standardized way. Then the outline of the arm was marked and the arm was photographed in order to process it in the CASAM system. By using this system all arms could be rescaled to the dimensions of the average of the 20 embalmed arms. This ensures that the 20 nerve courses could be compared directly. Besides using CASAM the distance between the two branches of the SBRN running over de First Extensor Compartment (FEC) was measured.

Research results

The image created in CASAM showed that in 90% of the arms, one branch of the SBRN crosses the FEC and one branch runs volar to the compartment. The distance between the two branches was 7.8 mm at the beginning of the FEC and 10.2 mm at the end. Finally the angle of incision at which the chance of damage to the nerves is lowest, is 19.4 degrees volar to the radius.

Research conclusions

The study shows a large variation in the course of the superficial branch of the radial nerve over the first extensor compartment. However no complete safe zone can be defined. The choice of incision remains surgeons’ preference and surgical skills are paramount to prevent iatrogenic nerve damage. The pre-study hypothesis was that there was a safe zone in which an incision for the Quervains disease could be made without chance of iatrogenic damage to the superficial branch of the radial nerve. This however was found not to be the case.

Research perspectives

Although many incision techniques can be found in literature no consensus on the best incision technique has been established. The study shows a large variation in the course of the superficial branch of the radial nerve over the first extensor compartment. However no complete safe zone can be defined. The choice of incision remains surgeons’ preference and surgical skills are paramount to prevent iatrogenic nerve damage. A randomized control trail comparing the incision techniques and their outcome could provide more evidence for the best possible incision technique in the future.

ACKNOWLEDGEMENTS

The authors would especially like to thank Y. Steinvoort and B.J. Kompanje for all the help in providing room for dissection and all specimens.

Footnotes

Manuscript source: Unsolicited manuscript

Specialty type: Orthopedics

Country of origin: Netherlands

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P- Reviewer: Angoules A S- Editor: Cui LJ L- Editor: A E- Editor: Li RF

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