V-shaped double-row distal triceps tendon repair: a novel technique using unicortical button fixation
© The Author(s) 2017
Received: 13 January 2017
Accepted: 6 March 2017
Published: 14 March 2017
This report was designed to present a novel technique combining suture anchor and unicortical button fixation for distal triceps tendon repair.
For anatomical reinsertion of an acute distal triceps tendon rupture, two suture anchors and one unicortical button forming a V-shaped configuration were used. The operative approach is described in detail.
Excellent clinical and functional results were achieved in the early postoperative phase. The patient reached full elbow range of motion and extension muscle strength (5/5) compared to the uninjured arm 12 weeks after surgery. Complications did not occur.
This is the first report using unicortical button fixation in distal triceps tendon repair with promising preliminary results.
Level of evidence
Technical description, case report, Level V
KeywordsDistal triceps Double row unicortical button Tendon repair
The distal triceps tendon rupture is a rare entity [1–3]. Anzel et al. published a series of 1014 cases of tendon and muscle disruption. Only 1% of them involved the distal triceps tendon . The mechanism of injury is mainly a fall on the outstretched forearm or contraction against resistance (weightlifting) [5, 6]. Triceps tendon ruptures are furthermore associated with systemic diseases (e.g. hyperparathyroidism), corticosteroid use and anabolic steroid abuse [7, 8]. Especially men and professional American football players are at increased risk to suffer distal triceps tendon tears . Anatomic studies have shown that total and/or partial tendon tears mostly occur at the bone–tendon interface on the olecranon insertion site, and also musculotendinous and intramuscular tears have been described [9–12].
For anatomic reconstruction of distal triceps tendon ruptures, a standard surgical technique has not yet been established. In the transosseous cruciate repair technique, Krakow-type sutures placed in the tendon are passed through two crossing bone tunnels and tied over a bone bridge. However, this procedure has shown a high re-rupture rate of up to 21% .
The purpose of currently published techniques is the anatomic reinsertion at the bony footprint of the olecranon with restored tendon–surface contact . Learning from the progress of arthroscopic tendon repair at the shoulder joint, Yeh et al. reported of a suture anchor repair for distal triceps ruptures . The authors compared this single- and double-row suture anchor repair technique with the transosseous cruciate repair technique. They could demonstrate that the anatomic repair with a suture bridge consisting of four anchors provides superior footprint contact characteristics and lowest displacement during increased cyclic loading compared to single-row repair and transosseous cruciate repair . In 2014, Clark et al. reported on a new knotless anatomic repair technique to minimise the risk of intra-articular joint breach, knot failure, as well as bursal and subcutaneous irritation. Two bone tunnels and one knotless anchor were used. This technique showed significantly higher load and cycle to failure compared to the traditional transosseous cruciate repair [16, 17].
In the present article, we describe a novel technique for anatomic footprint repair in case of distal triceps tendon ruptures using two suture anchors and one intramedullary placed button in a V-shaped double-row configuration.
Case presentation and technical description
We report on the case of a 30-year-old male patient with an acute distal triceps tendon rupture after a snowboarding accident. The patient described a fall onto the extended forearm followed by immediate pain and weakness upon extension of the elbow. Clinical evaluation showed an inability to extend the elbow against resistance. Radiographs of the elbow (ap- and lateral-view) excluded osseous lesion. Subsequent magnetic resonance imaging (MRI) confirmed the diagnosis of a total rupture of the triceps tendon with 15 mm of retraction.
For surgery (14 days after injury), the patient was positioned in the prone position. A standard posterior approach was used for exposure of the distal triceps tendon rupture. The tendon was mobilised and debrided at the rupture site. Then, the footprint at the olecranon was identified and the bone bed debrided. Two 5.5-mm double-loaded titanium suture anchors (5.5 Corkscrew FT, Arthrex Inc., Naples, FL, USA) were placed at the proximal area of the footprint, one medial and one lateral. A Krakow whipstitch was performed at the distal triceps tendon with both ends of each Fiberwire®. In the following, the sutures were tied. Subsequently, one end of each suture was cut.
For postoperative management, the elbow was immobilised in a posterior splint (90° of elbow flexion) for 5 days. Subsequently, a mobile, hinged brace (Epico ROM, medi, Bayreuth, Germany) was applied for 6 weeks, limiting elbow flexion to 90°. Passive and active (gravity-assisted) motion was started at day 1 after surgery with restriction of active extension for 6 weeks. Sports activities were allowed after 12 weeks.
Discussion and conclusions
The novel technique of double-row distal triceps tendon repair performing a V-configuration by unicortical button fixation showed an excellent functional outcome in the present case. To the best of our knowledge, this is the first report dealing with unicortical button fixation in triceps tendon repair.
Kim et al. showed superior results in strength, stiffness and gap formation using the double-row technique. Mazzocca et al. found equivalent results for load-to-failure, cyclic loading and gap formation for the single-row technique compared to the double-row repair. However, a larger area of the footprint was restored using the double-row technique [27, 28]. These biomechanical findings were now transferred to distal triceps tendon repair .
The V-shaped double-row repair technique combines the outclassing properties of an anatomical footprint coverage and technical advantage of using a single fixation distal to the joint. The unicortical button fixation enables a modification in tendon contact pressure by tightening or loosening the sutures, once the fixation system has been installed. This represents a technical key benefit compared to the suture bridge repair or the knotless anatomic repair. Similar to already-described techniques, an accelerated rehabilitation program is practicable due to double-row repair. Titanium suture anchors were used in the present case; however, bio-absorbable suture anchors would be a potential alternative for proximal row fixation.
Siebenlist et al. established “the intramedullary cortical button fixation technique” for distal biceps tendon repair [18, 29]. They have shown that biomechanical characteristics for this repair technique are comparable or superior to suture anchor repair and bicortical button fixation, respectively [18, 30]. Buchholz et al. also found no major differences between monocortical button fixation versus interference screw for subpectoral proximal biceps tenodesis . However, it has to be clearly stated that no biomechanical studies exist for unicortical button fixation in distal triceps tendon repair.
The main advantages of the present fixation technique are the reduced risk of iatrogenic fractures at the proximal ulna due to monocortical drilling, a simple implantation and lower implant costs compared to double-row anchor systems (two anchors and one button instead of four anchors) [16, 17]. However, transosseous techniques have the favourable costs. Additionally, this technique facilitates a complete footprint coverage with a flat contact pressure to possibly favour tendon-to-bone healing. The preliminary excellent functional results in the present case are encouraging to continue using the V-shaped double-row repair technique for triceps tendon ruptures. Nevertheless, the present report has a limited clinical follow-up of 3 months what is too short to compare this technique to others. Therefore, further follow-up evaluation including objective strength measurements and MRI controls is mandatory.
The V-shaped double-row fixation represents a novel, alternative technique for treatment of distal triceps tendon ruptures with promising preliminary clinical results. Compared to previous published reconstruction methods, the advantage of this technique is the possible modification in tendon footprint coverage once the fixation system has been installed. Furthermore, the iatrogenic fracture risk can be reduced by monocortical drilling. However, additional studies are needed to evaluate the long-term efficacy of this surgical procedure.
magnetic resonance imaging
range of motion
All authors contributed in a significant way in the steps of processing the patient history as well as writing and editing the manuscript. BS and SS conceived of the idea for the study/publication. LL additional was engaged in writing the first draft and provided research support. AI advice throughout the project and reviewed the manuscript. All authors read and approved the final manuscript.
The authors declare that they have no competing interests.
Availability of data and materials
The datasets used and/or analysed during the current study are available from the corresponding author.
Ethical approval and consent to participate
All procedures performed in this study involving human participants were in accordance with the 1964 Helsinki declaration and its later amendments or comparable ethical standard. An approval of the institutional ethic committee was not applicable for this study. Written informed consent was obtained a priori by all participants and the department of anatomy for cadaveric demonstration.
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