Percutaneous internal fixation of selected scaphoid nonunions with an arthroscopically assisted dorsal approach

Surgical Treatment of Scaphoid Fractures: Recommendations for Management

Background: Several operative treatments exist for scaphoid fractures, varying by approach (e.g., ercutaneous, volar, or dorsal), implant type (e.g., screw or Kirschner wire), and bone raft choice (e.g., none, nonvascularized, or vascularized). Many previous systematic eviews and meta-analyses have investigated outcomes following different surgicalÚpproaches, the use of vascularized versus nonvascularized bone graft for scaphoidßracture nonunions, and treatment for specific fracture patterns. However, given the advancements n scaphoid fracture treatment in recent years, there is a need for updated treatment recommendations hat would be beneficial to hand surgeons. Purpose: We present a comprehensive review of the operative treatment of scaphoid fractures based on recent literature and propose a unified treatment algorithm for managing these fractures. Methods: The English-language literature was searched from 2002 to 2023 for high evidence level (e.g., randomized trials), review, and meta-analysis articles with the following search terms: "scaphoid, "u8220"scaphoid" AND "nonunion, " and "scaphoid" AND "malunion. " Each article was creened by the authors to determine the scaphoid fracture scenario addressed and ubsequent treatment recommendations. The findings from article reviews were then rganized by scaphoid fracture types in this manuscript. Results: A total of 95 pertinent articles were ultimately selected and used as the basis for reviewing different scaphoid fracture scenarios. A treatment algorithm was then proposed based on literature review. Conclusion: This summary of the recent literature can guide hand surgeons in addressing scaphoidßractures. Future research in scaphoid fracture treatment, particularly for nonunions, would be most beneficial n the form of systematic review, meta-analysis, or multicenter prospective randomized clinical trials. Level of Evidence: IV.

Scaphoid fracture and nonunion: new directions

The scaphoid is the largest of the carpal bones, articulating with both proximal and distal carpal rows. If scaphoid fractures are not appropriately diagnosed and treated, there is a risk of nonunion, osteonecrosis and degenerative arthritis. Operative management of the scaphoid fracture is primarily determined by the fracture location and amount of displacement. There is increased momentum for dual screw fixation constructs, intended to provide greater stability and reduce the risk of nonunion. Our current practice is to utilize two screws without graft as a first-line treatment for scaphoid nonunion with or without humpback deformity and cyst formation. This review will discuss the management of acute scaphoid fractures and the treatment of nonunion.

Arthroscopic versus open cancellous bone grafting for scaphoid delayed/nonunion in adults (SCOPE-OUT): study protocol for a randomized clinical trial

BACKGROUND

Scaphoid non-union results in pain and decreased hand function. Untreated, almost all cases develop degenerative changes. Despite advances in surgical techniques, the treatment is challenging and often results in a long period with a supportive bandage until the union is established. Open, corticocancellous (CC) or cancellous (C) graft reconstruction and internal fixation are often preferred. Arthroscopic assisted reconstruction with C chips and internal fixation provides minimal trauma to the ligament structures, joint capsule, and extrinsic vascularization with similar union rates. Correction of deformity after operative treatment is debated with some studies favouring CC, and others found no difference. No studies have compared time to union and functional outcomes in arthroscopic vs. open C graft reconstruction. We hypothesize that arthroscopic assisted C chips graft reconstruction of scaphoid delayed/non-union provides faster time to union, by at least a mean 3 weeks difference.

METHODS

Single site, prospective, observer-blinded randomized controlled trial. Eighty-eight patients aged 18-68 years with scaphoid delayed/non-union will be randomized, 1:1, to either open iliac crest C graft reconstruction or arthroscopic assisted distal radius C chips graft reconstruction. Patients are stratified for smoking habits, proximal pole involvement and displacement of > / < 2 mm. The primary outcome is time to union, measured with repeated CT scans at 2-week intervals from 6 to 16 weeks postoperatively. Secondary outcomes are Quick Disabilities of the Arm, Shoulder and Hand (Q-DASH), visual analogue scale (VAS), donor site morbidity, union rate, restoration of scaphoid deformity, range of motion, key-pinch, grip strength, EQ5D-5L, patient satisfaction, complications and revision surgery.

DISCUSSION

The results of this study will contribute to the treatment algorithm of scaphoid delayed/non-union and assist hand surgeons and patients in making treatment decisions. Eventually, improving time to union will benefit patients in earlier return to normal daily activity and reduce society costs by shortening sick leave.

TRIAL REGISTRATION

ClinicalTrials.gov NCT05574582. Date first registered: September 30, 2022. Items from the WHO trial registry are found within the protocol.

Scaphoid Nonunion: A Review of Surgical Strategies

The scaphoid is predisposed to nonunion after fracture because of its tenuous blood supply and propensity for delayed diagnosis. Many surgical techniques exist and continue to be developed to treat scaphoid non-unions. However, with variability in patient presentation, differences in nonunion location and type, and multiple bone graft sources and fixation options, selecting a surgical strategy proves a difficult task. The goal of this article is to provide an updated review of surgical strategies used to treat scaphoid nonunions. Particular attention is paid to methods of fixation as well as the ongoing debate over indications for structural and vascularized bone grafting. [Orthopedics. 2022;45(5):e235-e242.].

Does the Use of Gelled Platelet-Rich Plasma during Fixation of Subacute Proximal Pole Scaphoid Fractures Help? - A Single Centre Experience

Background: Subacute proximal pole scaphoid fractures (1 month to 6 months) have a higher risk of non-union. The aim of the present retrospective analysis is to evaluate the efficacy of gelled platelet-rich plasma (GPRP) as additional treatment to antegrade headless screw fixation of proximal pole scaphoid fractures. Methods: Forty-one patients were divided into two groups based on surgical treatment received: screw fixation alone (group A) and screw fixation and GPRP application at the fracture site (group B). A short cast was maintained for 4 weeks after surgery. Outcome measures included time to union, need for additional procedures, time to return to work, disabilities of the arm, shoulder, and hand (DASH) questionnaire, Michigan Hand Questionnaire (MHQ) and Mayo wrist score (MWS).Time to union was determined by monthly radiographs and confirmed by a computerized tomographic (CT) scan done at 4 months. Results: Union was achieved in 85.7% of patients in group A and in 100% of patients in group B. Patients in group B showed a faster time to healing (2.3 ± 0.4 months vs 3.1 ± 0.7 months, p = 0.0001) and earlier return to work (10.4 ± 2.2 vs 15.1 ± 2.9, p = 0.0001). There were no significant differences in patient-rated outcomes scores between the two groups at final follow-up. Conclusions: Internal fixation alone is effective in treating subacute proximal pole scaphoid fractures. GPRP application improves bone healing and functional recovery. Level of Evidence: Level III (Therapeutic).

Bone Morphogenic Protein 2 Use for the Surgical Treatment of Acute Scaphoid Fractures and Scaphoid Non-unions

BACKGROUND

Bone morphogenic protein 2 (BMP-2) has demonstrated promise as an adjunct to surgically treating fractures. Its reported use in the upper extremity is limited. Questions/purpose: This study reports union rates, outcomes, and complications of scaphoid fractures treated with adjunctive BMP-2 to further characterize BMP-2 use in the hand and wrist.

METHODS

Retrospective review of scaphoid fractures treated surgically in one region of the military health system from 2009 to 2019 was conducted to identify cases employing BMP-2. Fracture healing was determined by computed tomography. Primary outcomes were union rate, time to union, and complications. Secondary outcomes included union rates for prior non-unions, union rates at 4 & 6 weeks, and functional outcomes.

RESULTS

Fourteen patients met inclusion criteria. Non-unions accounted for 50% of included fractures. The total union rate was 93%. Mean time to union was 6.2 weeks. All acute fractures healed with mean time to union of 4.8 weeks. Non-unions had a union rate of 86% with mean time to union of 7.7 weeks. Four patients (29%) developed radiographic heterotopic ossification (HO); however, there was no significant decrease in motion was appreciated. Thirteen patients (93%) resumed the push-ups portion of the military fitness test. No major complications were identified during follow up.

CONCLUSIONS

Adjunctive use of BMP-2 in operative fixation of scaphoid fractures resulted in desirable union rates without major complications. Larger, prospective studies are needed to assess if adjunctive BMP-2 use in scaphoid fractures provides significant benefit versus other treatments.

History of Wrist Arthroscopy

Wrist arthroscopy has a rich history, drawing on contributions from around the world. Its foundation was laid in Japan with Kenji Takagi and Masaki Watanabe, who developed the arthroscope and the techniques for arthroscopy. Across several decades they advanced the optic and lighting technology, allowing the miniaturization which made wrist arthroscopy technologically feasible. A safe and standardized technique for wrist arthroscopy was evolved by Terry Whipple, Gary Poehling, and James Roth in the 1980s, and they shared this with their fellow surgeons through courses and publications. The techniques then spread across the world, leading to widespread uptake and exploration of new therapeutic possibilities. The worldwide spread of wrist arthroscopy was accelerated by the European Wrist Arthroscopy Society (EWAS), founded in 2005 by Christophe Mathoulin. The Asia Pacific Wrist Association (APWA), founded by PC Ho in 2015, also extended the progression of wrist arthroscopy. This article brings together this history and tells the global story of its development through the recollections of those involved. The manuscript includes some amazing videos of the early historical arthroscopy. There are also videos of Gary and Terry describing some of their special memories of the early politics, developments, and evolution of wrist arthroscopy.

Arthroscopic Treatment of Scaphoid Nonunion With Olecranon Bone Graft and Screw Fixation Leads to Union and Improved Outcomes

PURPOSE

To evaluate the outcomes of arthroscopic treatment of scaphoid nonunion using olecranon bone graft and screw fixation and to analyze the outcomes in accordance with variations in the chronicity, location, and severity of nonunion.

METHODS

Between March 2012 and December 2020, patients with diagnoses of scaphoid delayed nonunion and nonunion with substantial bone resorption (Slade and Dodds grade IV-VI) underwent arthroscopic-assisted olecranon bone graft and screw fixation. Preoperative and postoperative measurements included the visual analog scale score for pain; range of motion; grip strength; the Modified Mayo Wrist Score; the Disabilities of the Arm, Shoulder and Hand (DASH) score; and the minimal clinically important difference for the DASH score. Union rate and duration were also evaluated. The outcomes between groups of patients with different conditions were analyzed.

RESULTS

Twenty-two patients were included. The average follow-up period was 32.5 months. The visual analog scale pain score, range of motion, grip strength, Modified Mayo Wrist Score, and DASH score were significantly improved after surgery (P < .001). The minimal clinically important difference threshold for the DASH score was reached by 100% of patients. At final follow-up, all patients had united scaphoid with no complications. The average time to union was 15.3 weeks. Group analysis showed significant improvements in mean grip strength between patients with delayed union (3-6 months) and those with chronic nonunion (> 1 year) (17.75 kg vs 12.25 kg, P = .032), between grade IV nonunion and grade V nonunion (14.86 kg vs 10.43 kg, P = .035), and between grade V nonunion and grade VI nonunion (10.43 kg vs 15.63 kg, P = .013). Patients with grade VI nonunion achieved union at 17.8 weeks postoperatively, a significantly longer period than that for patients with grade IV nonunion (11.4 weeks, P = .014).

CONCLUSIONS

Arthroscopic treatment of scaphoid nonunion using olecranon bone graft and screw fixation provided satisfactory outcomes regardless of the chronicity, location, and severity of nonunion.

LEVEL OF EVIDENCE

Level IV, therapeutic case series.

Management of Proximal Pole Scaphoid Nonunions: A Critical Analysis Review

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Optimal management of nonunions of the proximal pole of the scaphoid is controversial and dependent on many patient and pathophysiologic considerations.

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If the proximal pole subchondral bone support is sufficient, options include open reduction and internal fixation, either alone or in combination with autologous nonvascularized or vascularized bone graft.

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If the proximal pole is not salvageable, replacement with osteochondral autografts or osteochondral flaps is the only option for reconstruction of the native anatomy.

A systematic review of mechanical stabilization by screw fixation without bone grafting in the management of stable scaphoid non-union

INTRODUCTION

Sixty percent of all carpal fractures affect the scaphoid bone, with an annual incidence of 4.3/10,000. Displacement and instability are the main risk factors for non-union, but missed diagnosis, location of fracture and poor blood supply are also risk factors. Non-union is defined as non-healed fracture on radiographs 6 months after the injury and this can lead to degenerative wrist arthritis. Treatment options vary from internal fixation with bone grafting to salvage procedures including arthrodesis of carpals. We aimed to determine the effectiveness of screw fixation without bone grafting for the treatment of stable well-aligned scaphoid non-union.

METHODS

In this systematic review, MEDLINE, Science Direct, Web of Science and CINHAL were searched from inception to May 2019. All clinical studies that examined the functional and radiological outcomes of screw fixation without bone grafting to treat stable scaphoid non-union were included.

RESULTS

838 articles were retained of which 6 case series, describing 95 patients who had undergone scaphoid non-union fixation without bone grafting, were included. Favourable functional outcomes were reported by the 6 included studies using validated functional outcome measures ROM improved to weighted mean of 67.5° (±13°) and 62.12° (±13°) for flexion and extension respectively. The fracture had united in 91 out of 95 participants with a union rate of 95.7% (95%, CI 89.5 to 98.8) and the weighted mean time to union was 3.8 (±1.5) months.

CONCLUSION

Rigid screw fixation without bone grafting can be suggested for the treatment of selected well aligned scaphoid nonunions to achieve healing and good functional outcomes. However, adequately powered clinical studies with good methodology are essential to draw an accurate conclusion.

Robot-assisted double screw fixation of minimally displaced scaphoid waist fracture nonunions or delayed unions without bone graft

We retrospectively reviewed 12 minimally displaced fractures of the scaphoid waist in 12 patients who developed delayed or nonunions with or without conservative treatment. Mean time between injury and surgery was 6 months (range 3-12). The fractures were stabilized with double screws, which were percutaneously inserted with robot assistance, and without bone grafting. All fractures united at a mean of 8 weeks (range 6-10) after surgery. The patients were followed-up at 6 months and 1 year. The patients recovered good wrist function. No major postoperative complications were reported, and the patients returned to their usual level of activity. Robot assistance gave a high degree of accuracy when placing the cannulated screws since only two attempts were needed for correct placement of the guide wires. We explain the high union incidence by patient selection, good stabilization and not disturbing the vascular supply.Level of evidence: IV.

3D printing-assisted percutaneous fixation makes the surgery for scaphoid nonunion more accurate and less invasive

Purpose

The study was to explore whether the 3-dimensional printing guiding plate system could facilitate the modified procedure for arthroscopic treatment of nondisplaced scaphoid nonunion.

Methods

Patients, diagnosed with scaphoid nonunion without displacement, were randomly assigned into two groups. In Group A, the 3-dimensional printing guiding plate system was used for guiding fixation during the surgery. In Group B, fixation was performed with intra-operative fluoroscopy. The bone operation time was recorded during the surgery. The patients were evaluated before surgery and followed-up after six post-operative months, including motion ratio, strength ratio, Visual Analogue Scale, modified Mayo Scores, Patient Rated Wrist Evaluation scores, plain radiography and CT scan.

Results

Sixteen patients were recruited for the study. The average bone operation time in Group A was statistically shorter than that in Group B.

Conclusions

3-dimensional printing technique-assisted arthroscopic bone graft and fixation of scaphoid nonunion constitute an effective and accurate clinical treatment option.

The translational potential of this article

The concept and technique of 3D printing assisted percutaneous fixation introduced in this paper have the potential to be applied in a variety of operations requiring accurate percutaneous fixation, especially for the joint injuries.

Arthroscopic realignment and osteosynthesis of unstable scaphoid nonunion with cancellous bone graft from the ipsilateral radius

PURPOSE

The treatment of delayed union and established nonunion of the scaphoid using a volar approach with impaction of bone graft, either a cancellous or cortico-cancellous wedge graft, for osteosynthesis and maintenance of reduction. With the advancement of instruments and techniques of wrist arthroscopy, wider indications for wrist problems can be solved by this minimally invasive technique. We report our results of arthroscopic reduction, cancellous bone grafting to the regional distal radius, and headless screw fixation for the treatment of scaphoid nonunion, even with humpback deformity.

METHODS

Between August 2014 and February 2018, 41 patients (42 wrists) with unstable scaphoid nonunion received arthroscopic surgery. The mean follow-up was 38.1 months (range 24-70 months). We evaluated the results with a function questionnaire and clinical outcomes based on the visual analog scale (VAS) pain score, range of motion and grip strength, and radiologic measurements.

RESULTS

The union rate was 92.6% (38/41 patients) and union time was 4.6 months. Patients regained almost a full range of motion compared with the contralateral wrist. The post-op Quick DASH, Mayo wrist score, and VAS pain score all had significant improvement, with p < 0.05. The scapholunate angle showed significant correction from pre-op 68.0° to post-op 58.3°. The average VAS satisfaction score at final follow-up was 8.7.

CONCLUSION

Arthroscopic realignment and osteosynthesis for the treatment of unstable scaphoid nonunion with ipsilateral radius bone graft, even with humpback deformity, can achieve a high union rate, good radiological correction, and good functional recovery.

Screw fixation without bone grafting for scaphoid fracture nonunion

INTRODUCTION

We previously reported the classification of the scaphoid fracture nonunions as linear, cystic, and sclerotic or displaced types based on radiographic findings. We have been treating the linear and cystic type fractures via screw fixation without bone grafting and the sclerotic or displaced type fractures via screw fixation with bone grafting. In this retrospective study, we report the treatment outcomes of the linear and cystic types of scaphoid fracture nonunions.

METHODS

Nineteen patients with linear and cystic type scaphoid fracture nonunions were included. Two patients had linear type and 17 had cystic type fractures. All the patients were male, their mean age was 29.2 years. All patients were treated with screw fixation alone by a single surgeon.

RESULTS

Bone union was achieved in 17 cases. The mean time to bone union was 3.7 months. Bone union was not achieved in one case of linear type and one case of cystic type fracture. The former was thought to be due to misdiagnosis of displaced type as linear type fracture; however, no obvious reason could be found for the latter.

DISCUSSION

Screw fixation alone could help achieve bone union in linear type scaphoid fracture nonunions. However, if the type of the fracture is difficult to diagnose based on plain radiography, evaluation using computed tomography should be performed. The cystic type fractures may need to be subclassified according to the location or size of the cyst as well as the viability of the proximal bone fragment.

Comparison of Shape Memory Staple and Gelled Platelet-Rich Plasma versus Shape Memory Staple alone for the Treatment of Waist Scaphoid Nonunion: A Single-Center Experience

Purpose  The aim of this study was to analyze the results of two different methods of surgical treatment of waist scaphoid nonunions (SNUs). We retrospectively analyzed data from 87 patients referred to our department from January 2010 to December 2017 who were surgically treated for waist SNU.

Methods  The mean period of time passed from trauma was 11.2 (±5.6) months. Patients were divided into two groups based on surgical treatment received: volar exposure osteosynthesis with shape memory staple (SMS) (group A) and volar exposure osteosynthesis with SMS and gelled platelet-rich plasma (GPRP) application at the bone defect level (group B). A cast (thumb excluded) was maintained for 4 weeks. Healing was checked clinically (pain, QuickDASH [Disabilities of the Arm, Shoulder, and Hand] score, Mayo Wrist Score) and radiologically (standard X-ray).

Results  Union was achieved in 40 patients in group A (95.2%) and in all patients in group B (45 patients; 100%). A statistically significant difference was observed in the improvement of the Mayo Wrist Score, QuickDASH score, and pain (measured through the visual analog scale) after 3 months from surgery ( p  = 0.02).

Conclusion  SMS is effective in treating waist SNU at more than 6 months from trauma. GPRP application can improve bone healing and upper limb function.

Level of Evidence  This is a retrospective observational Level III study.

Drill and Fill Technique for the Treatment of Scaphoid Delayed Unions and Nonunions

Background  This article reviews the results of a surgical technique using three iterations of drilling , autologous cancellous bone grafting ( filling ), and use of an intraosseous compression screw for the treatment of nondisplaced or minimally displaced scaphoid delayed unions or nonunions. Methods  Part 1-Cadaveric study: Three cadaveric scaphoids underwent stained cancellous bone graft packing and headless cannulated compression screw placement using a single iteration of drilling and graft packing. Three additional scaphoids were allocated to the triple "drill and fill" group, and underwent three iterations of drilling and graft packing before screw insertion. Graft particle distribution on mid-sagittal sections was assessed under fluorescence microscopy. Comparison of normalized areas between the single and triple "drill and fill" groups was performed using repeated measures ANOVA and Tukey's post hoc test. Part 2-Clinical study: Twelve patients with minimally displaced scaphoid delayed unions and nonunions treated between April 2007 and December 2013 with the triple "drill and fill" technique were included. The average follow-up was 60.4 weeks. Two fellowship-trained musculoskeletal radiologists independently reviewed images for fracture healing. Results  By the histomorphometric analysis, there was improved autograft distribution along the screw tract, particularly within the proximal pole, with three iterations of drilling and filling. Clinically, 11 of 12 delayed unions and nonunions had healed. Conclusion  Our results support the use of the "drill and fill" technique as an option for the treatment of select nondisplaced or minimally displaced scaphoid nonunions and delayed unions at the waist without avascular necrosis of the proximal pole. Level of Evidence  This is a Level IV study.

Dry Wrist Arthroscopy for Radial-Sided Wrist Disorders

The development of wrist arthroscopy has been useful in diagnosis, prognosis, and treatment of both ligament and osseous injuries. As the treatment indications and techniques become more refined, this article explores the role of dry arthroscopy to treat radial-sided disorders of the wrist.

Scaphoid Reconstruction

Surgical strategies for scaphoid nonunions become more complex based on time from injury to treatment. The decision-making process, however, can follow a logical sequence. Scaphoid nonunions less than 1 year after trauma and no carpal malalignment can be treated with percutaneous screw fixation under fluoroscopic and/or arthroscopic guidance. Reinterventions or patients with avascular proximal poles that do not need substantial grafts are reliably treated with pedicle vascularized bone grafts. Resection of the distal pole of the scaphoid is a good option in old nonunions or after a failed scaphoid procedures. When there are radioscaphoid degenerative changes, salvage procedures such as proximal row carpectomy (PRC) should be considered.

Robot-assisted percutaneous scaphoid fracture fixation: a report of ten patients

This study reports the technique, efficacy and safety of robotic-assisted, computer-navigated, percutaneous fixation of scaphoid fractures. Ten males with acute undisplaced waist fractures underwent fixation with this method using a commercially available three-dimensional fluoroscopy unit and robotic navigation system. The mean total operative duration was 40 minutes, which comprised of a set-up time of 18 minutes and planning and surgical time of 22 minutes. All patients required only a single guidewire insertion attempt, and there were no screw protuberances or other complications. All fractures united at a mean of 8 weeks. At a mean follow-up of 6.5 months (range 6-8), the mean Mayo wrist score was 96, patient-rated wrist evaluation was 2, flexion-extension arc was 96% and grip strength was 91% of the contralateral side. We conclude from our patients that robotic-assisted percutaneous scaphoid fixation is feasible, safe and accurate, and is a satisfactory method for treating these injuries. Level of evidence: IV.

The Author's Technique for the Management of Unstable Scaphoid Nonunions: Tips and Tricks

This article presents historical aspects, rationale, indications, planning, and execution of anterior interpositional bone grafting technique for unstable scaphoid nonunions. The author's original technique considers four points: (1) preoperative planning based on comparative anteroposterior radiographs in maximal ulnar deviation was used to calculate resection zone, size of the graft, and scaphoid length; (2) a volar approach was used; (3) an iliac crest wedge-shaped corticocancellous graft was interposed; and (4) Kirschner wires were inserted for fixation. Contemporary refinements of the technique including a modification to treat nonunions with failed previous screw fixation with tricks and hints and results are shown.

The Role of Vascularized Bone Grafting in Scaphoid Nonunion

Management of scaphoid nonunions requires thoughtful preoperative and intraoperative consideration to evaluate for scaphoid flexion or humpback deformity, carpal collapse, and proximal pole vascularity. Most scaphoid nonunions do not require vascularized bone grafts; however, in the setting of avascular necrosis of the proximal pole, vascularized bone grafts should be used to optimize union rates. In addition, scaphoid geometry and carpal stability must be restored to enhance functional outcomes.

Primary medial femoral condyle vascularized bone graft for scaphoid nonunions with carpal collapse and proximal pole avascular necrosis

This study aimed to determine the outcome of free vascularized medial femoral condyle bone grafts in the primary treatment of scaphoid nonunions with scaphoid foreshortening or carpal collapse and intraoperatively documented avascular necrosis. Thirty-two patients (28 male, four female) met the inclusion criteria. Median time from injury to surgery was 70 weeks. Thirty of 32 patients healed at a median of 12 weeks. There was significant improvement from preoperative to postoperative lateral intrascaphoid angle, scapholunate angle, and radiolunate angle. Two scaphoids failed to unite; one patient underwent scaphoidectomy and four-corner fusion 15 months postoperatively after suffering a subsequent injury. Another patient underwent 1,2-intercompartmental supraretinacular artery-based vascularized bone grafting at 4 months postoperatively and then scaphoid excision with four-corner fusion 4 years later. The free vascularized medial femoral condyle bone graft restores scaphoid vascularity and architecture while promoting union in a subset of scaphoid nonunions that has historically been a clinical challenge. Level of evidence: IV.

[Scaphoid pseudarthrosis without circulatory disorder : Management and standard procedure for primary treatment]

Nonunion of the scaphoid is a severe complication of often insufficiently treated scaphoid fractures or those which have been diagnosed too late. The treatment of scaphoid nonunion is challenging und should be performed by experienced hand surgeons. The anatomical shape, the retrograde blood supply and the biomechanics of the scaphoid complicate the healing process. A delayed union or nonunion of the fractured scaphoid leads to persistent pain, restricted mobility and degenerative changes of carpal bones and wrist. The goal of treatment is bony healing of the pseudarthrosis with reconstruction of the anatomical shape and restoration of the axial alignment of the scaphoid. A prerequisite is the right choice of the different treatment options available. Fundamental to this is a careful pretherapeutic assessment as well as an individual classification of the pathological alterations and the morphological features of the nonunion. For this purpose, radiological cross-sectional imaging by means of computed tomography is essential. There is no consensus in the literature about the treatment of scaphoid nonunion. The available data do not enable the establishment of a superior treatment procedure. The most common surgical procedure used to treat scaphoid nonunion is autologous bone grafting combined with screw fixation. This article provides an up to date overview of the management and standard procedures for the primary treatment of scaphoid nonunion without a circulatory disorder.

HOW SCAPHOID FRACTURES ARE TREATED IN BRAZIL

OBJECTIVE

To verify how hand surgeons manage scaphoid fractures and their complications.

METHODS

Two hundred questionnaires were distributed during the 36^th Brazilian Hand Surgery Congress (2016).

RESULTS

On suspicion of fracture without radiographic confirmation, 57% of surgeons request a CT or MRI scan, while 43% opt for immobilization and consecutive radiographs. In stable fractures the preference was for treatment with plaster cast. In fractures with no scaphoid waist displacement, 33% opt for percutaneous fixation. In displaced waist or proximal pole fractures, 66% and 99.4%, respectively, opted for surgical treatment. Most surgeons treat waist nonunion with a nonvascularized bone graft. When absorption at the site of nonunion is greater than 4 mm, 50% prefer to use iliac graft and screw fixation. In proximal pole nonunion, the Zaidemberg technique is preferred by 64%. More experienced surgeons are more likely to request tests in occult fractures (63.9% versus 47.6%; p=0.04), and tend to recommend surgery for distal third fractures more frequently (16.4% versus 4.7%; p=0.02).

CONCLUSIONS

We have provided an overview of treatment preferences for scaphoid fractures. It should be noted that more experienced surgeons are more likely to request additional tests for occult fractures and to recommend surgical treatment of distal third fractures. Level of Evidence IV, Cross-sectional survey.

Surgical Strategy for Scaphoid Nonunion Treatment

Scaphoid fracture is the most common carpal fracture. Nonunion rate has been reported around 10 to 15% of scaphoid fractures. Risk factors for scaphoid nonunion are known as location, displacement, poor vascularity, time to treatment etc. The goals of surgical treatment for scaphoid nonunion are to achieve bony union, to correct carpal deformities and also to prevent progressive carpal instability and arthritis. Scaphoid nonunion can cause scaphoid nonunion advanced collapse (SNAC) which is a pattern of progressive degenerative radiocarpal and midcarpal arthritis secondary to posttraumatic pathomechanics of the scapholunate joint. Achieving bony union is essential to prevent carpal collapse or arthritis. To improve bony union, many surgical procedures including various forms of bone grafting have been developed and attempted. However, there is a controversy about which procedure is the most effective. In this review, we provide an overview of surgical treatment methods for scaphoid nonunion and discuss proper surgical strategies for scaphoid nonunion which requires surgical management.

Screw Fixation Alone for Scaphoid Fracture Nonunion

Scaphoid fracture nonunion can often lead to pain, arthrosis, and disability. While typically the result of delayed diagnosis or inadequate treatment, it can sometimes occur even if the initial care was timely and appropriate. Whereas early recognition of acute fractures allows for nonoperative management, nonunions frequently require surgical treatment. Traditionally, this has involved open debridement and bone grafting. However, some publications suggest that certain stable nonunions may be amenable to percutaneous debridement and fixation without formal bone grafting. Although certain characteristics appear to be appropriate indications for such management, well-designed clinical studies are needed to better define them.

The Outcome of Using a Jamshidi Biopsy Trocar Needle in a Novel Technique for Bone Grafting in Percutaneous Internal Fixation of Scaphoid Non-Union

INTRODUCTION:

We report the outcome of using a novel technique of minimally invasive internal fixation and distal radius bone grafting using the Jamishidi Trephine needle and biopsy/graft capture device.

METHODS:

The technique utilises a 8 mm incision at the distal pole of the scaphoid. The non-union is excavated using the standard Acutrak drill. An 8 gauge Jamshidi trephine needle is used to harvest bone graft from the distal radius which is impacted into the scaphoid and fixed with an Acutrak screw. Fifteen patients were available for retrospective review, 14 male, age mean 29.5 (15-56). Average time from injury to surgery was 167 days (45-72). Fractures classified according to Herbert giving 7 D1 and 8 D2 fractures, 14 waist and 1 proximal pole fractures, all of which had no humpback deformity.

RESULTS:

Sixty-six percentages of the fractures went onto unite, 4/7 D1 and 6/8 D2 united (p > 0.05). Seventy-five percentages of fracture that had surgery in less than 3 months from time of injury went onto unite, whereas only 63% united in patients who had surgery later than 3 months (p > 0.05). DASH outcome for all patients improved from 86 down to 32 (p < 0.05). With those that united going down from 90 to 6. Those that did not unite went from 81 to 61.

CONCLUSION:

The Jamshidi bone grafting technique shows comparable results (union rate 66%) to other techniques published in the literature (27-100%) providing the surgeon with an alternative and less demanding procedure than open scaphoid non-union surgery.

Time-dependent changes in bone healing capacity of scaphoid fractures and non-unions

The scaphoid is the most frequently fractured carpal bone and prone to non‐union due to mechanical and biological factors. Whereas the importance of stability is well documented, the evaluation of biological activity is mostly limited to the assessment of vascularity. The purpose of this study was to select histological and immunocytochemical parameters that could be used to assess healing potential after scaphoid fractures and to correlate these findings with time intervals after fracture for the three parts of the scaphoid (distal, gap and proximal). Samples were taken during operative intervention in 33 patients with delayed or non‐union of the scaphoid. Haematoxylin and Eosin (HE), Azan, Toluidine, von Kossa and Tartrate‐resistant acid phosphatase (TRAP) staining were used to characterise the samples histologically. We determined distribution of collagen 1 and 2 by immunocytochemistry, and scanning electron microscopy (SEM) was used to investigate the ultrastructure. To analyse the samples, parameters for biological healing status were defined and grouped according to healing capacity in parameters with high, partial and little biological activity. These findings allowed scoring of biological healing capacity, and the ensuing results were correlated with different time intervals after fracture. The results showed reduced healing capacity over time, but not all parts of the scaphoid were affected in the same way. For the distal fragment, regression analysis showed a statistically significant correlation between summarised healing activity scores and time from initial fracture (r = −0.427, P = 0.026) and decreasing healing activity for the gap region (r = −0.339, P = 0.090). In contrast, the analyses of the proximal parts for all patients did not show a correlation (r = 0.008, P = 0.969) or a decrease in healing capacity, with reduced healing capacity already at early stages. The histological and immunocytochemical characterisation of scaphoid non‐unions (SNUs) and the scoring of healing parameters make it possible to analyse the healing capacity of SNUs at certain time points. This information is important as it can assist the surgeon in the selection of the most appropriate SNU treatment.

The clinical result of arthroscopic bone grafting and percutaneous K-wires fixation for management of scaphoid nonunions

The purpose of this study is to analyze the clinical results of patients with scaphoid nonunion treated with arthroscopic bone grafting and K (Kirschner)-wires fixation.We retrospectively reviewed the records of 27 patients with scaphoid nonunion who had been treated with arthroscopic bone grafting and K-wires fixation method from November 2008 to February 2014. The average patient age was 35 years. The time from injury to treatment averaged 45 months. The average follow-up period was 18 months. Bone union was assessed using serial plain radiographs. The functional outcome was evaluated by comparing the modified Mayo wrist score with the visual analog scale (VAS) for pain, which were measured at the time of preoperation and at final follow-up.Union was achieved in 26 of the 27 nonunions (96.29%). The average radiologic union time was 10 weeks. The average VAS score decreased from 6.38 (range, 3-10) preoperatively to 1.59 (range, 0-3) at the final follow-up. The average modified Mayo wrist score improved from 60.19 preoperatively to 83.46 at the final follow-up. According to this score, there were 12 excellent, 6 good, and 9 fair results at the final follow-up.Arthroscopic bone grafting and percutaneous K-wires fixation is an effective treatment method for a scaphoid nonunion and has the advantages of allowing thorough assessment, enabling a comprehensive management approach for scaphoid nonunion in a minimally invasive manner, and this method can also be used for the scaphoid nonunion with SNAC stage I.

Scaphoid nonunion: what is the role of the Zaidemberg 1,2 intercompartmental supraretinacular arterial flap?

The reported results for the treatment of scaphoid nonunions with non-vascularized grafts are based on observational studies with a high variability in union rates from 38%-100% and time to union from 6-18 weeks, and there is also a lack of a standard classification. Meta-analyses and systematic reviews have been presented to better support conclusions from large pools of data (604 to 5246 cases), but their interpretation remains limited because of lack of uniformity in the studies analysed. Several authors have presented results from the Zaidemburg flap, with highly variable outcomes despite using the same technique; union rates have ranged from 27%-100% achieved between 6.5-19 weeks. Technical details that may be responsible for the discrepancies are discussed. There is a need for a validated prognostic classification system for scaphoid nonunions that can allow comparisons between outcome studies.

Results of percutaneous fixation and distal radius core decompression in scaphoid waist non-unions treated without grafting

Scaphoid non-union management is still a challenge in clinical practice for orthopaedic surgeons. Though several treatment methods have been described, there is an ongoing debate about optimum management. Based on new concepts about avascular conditions, promising results were reported with metaphyseal decompression of the distal radius by increasing the vascularization of the radial column of the carpus. We aimed to evaluate the clinical, radiological, and functional outcomes of distal radius core decompression and fixation with palmar percutaneous cannulated compression screws without grafting in patients with scaphoid waist fracture non-union. Twenty-nine patients with scaphoid non-union were included in this prospective study. There were 27 male and 2 female patients with an average age of 29 years (range 18-45 years). Mean time from the injury to surgery was 18.3 months. The Slade and Geissler classification was used to classify the non-unions. Wrist range of motion (ROM), pain based on a visual analog scale (VAS), and the Mayo wrist score were used to assess the clinical outcomes. Postoperative radiographs and CT-scans were reviewed to assess fracture union, carpal alignment and screw position. The average clinical follow-up was 76 weeks (range: 74-87 weeks) postoperatively. Mean time to union was 11 weeks (range: 7-18 weeks). There was no humpback/no DISI in any of the cases. Twenty-six patients healed successfully with no additional procedures. Three patients with failed union underwent revision surgery with grafting. At the final follow-up, average wrist ROM was 61° (range: 30-80) in extension and 61° (range: 35-80) in flexion, the average Mayo wrist score was 66±20 (range: 20-90), and the mean VAS was 2±2 (range: 0-7). Percutaneous fixation without grafting associated with distal radius core decompression can provide satisfactory outcomes in surgical management of scaphoid non-unions.

LEVEL OF EVIDENCE

II.

Análisis artroscópico de las lesiones asociadas a las fracturas de escafoides carpiano

Objetivo: La artroscopia de muñeca ha permitido el diagnóstico y el tratamiento de las fracturas a nivel de la muñeca, así como de las lesiones asociadas a estas.

Existen lesiones asociadas a las fracturas de escafoides que pueden condicionar el éxito del tratamiento y llevarnos a resultados poco satisfactorios y a un retraso en la recuperación funcional.

Material y método: Se estudiaron y cuantificaron las lesiones asociadas encontradas en 17 casos con fractura aguda de cintura de escafoides que fueron tratadas mediante reducción y colocación artroscópica de un tornillo canulado de escafoides. Se analizaron los resultados del tratamiento con la escala de muñeca de la Clínica Mayo (Mayo Wrist Score) y la consolidación con radiografías simples.

Resultados: Se diagnosticaron lesiones asociadas de tejidos blandos y/o condrales/osteocondrales en 14 casos, lo que supone un 82% de los casos. Las lesiones más frecuentemente encontradas fueron las lesiones del ligamento escafolunar (53%) en diferentes grados, las lesiones del fibrocartílago triangular (35,3%) y las lesiones osteocondrales (35,3%). Los resultados funcionales (Mayo Wrist Score) fueron excelentes o buenos en 13 de los pacientes (76,5%), en 3 casos (17,5%) los resultados fueron regulares y solo un caso (5,9%) tuvo un pobre resultado.

Conclusiones: La artroscopia ofrece una valoración completa de la muñneca y consigue diagnosticar lesiones asociadas a las fracturas de cuello de escafoides que pueden condicionar el resultado final del tratamiento.

Percutaneous, Transtrapezial Fixation without Bone Graft Leads to Consolidation in Selected Cases of Delayed Union of the Scaphoid Waist

Purpose  We evaluated clinical and radiographic outcome of percutaneous transtrapezial fixation of the scaphoid delayed union or nonunion using a headless bone screw without bone grafting. Methods  Sixteen patients with delayed union or nonunion of the scaphoid were included in this retrospective study between 2006 and 2011. All patients had a delayed presentation of scaphoid fracture, and none of them was treated conservatively elsewhere. Patients with bone graft, sclerotic bone debridement, or displacement of the fragment at the nonunion site were excluded. A percutaneous transtrapezial fixation technique was used in all cases. Patients were reviewed until clinical and radiographic union was observed. At the final follow-up, DASH (Disabilities of the Arm, Shoulder and Hand) and PRWHE (Patient-Rated Wrist and Hand Evaluation) outcome scores were completed. Results  Radiographic union was obtained in 15 out of 16 patients (94%) at an average follow-up of 36 months (range: 12-98 months). No complications from the percutaneous technique were noted. The average DASH score was 6 (range: 0-39) and the average PRWHE score was 10 (range: 0-56). No statistical significant difference in range of motion and grip strength was found between the operated side and the contralateral side. Conclusion  Percutaneous transtrapezial screw fixation for delayed or nonunion of selected scaphoid fractures without bone grafting is promising. At a mean of 4 months, 94% union was obtained with good functional results when there was no sclerosis, minimal osteolysis, and no displacement at the scaphoid nonunion site. Type of Study  Therapeutic study. Level of Evidence  IV.

Three-dimensional comparison of alternative screw positions versus actual fixation of scaphoid fractures

PURPOSE

The recommended technique for the fixation of a scaphoid waist fracture involves a headless compression screw placed in the proximal fragment center. This is usually accomplished by placing a longitudinal axis screw as visualized by fluoroscopy. The screw length has been shown to have a biomechanical advantage. An alternative to these options, which has been debated in the literature, is a screw placed perpendicular to the fracture plane and in its center. The perpendicular screw may have a biomechanical advantage despite the fact that it may be shorter. This study examined the differences in location and length in actual patients between a screw in the center of the proximal fragment with a longitudinal axis screw, and the actual fixating screw. These were then compared to a perpendicular axis screw.

METHODS

Pre- and post-operative CT scans of 10 patients with scaphoid waist fractures were evaluated using a 3D computer model. Comparisons were made between the length, location and angle of actual and virtual screw alternatives; namely, a screw along the central third of the proximal fragment (central screw axis) where the scaphoid longitudinal axis was calculated mathematically (longitudinal screw axis) and a screw placed at 90° to the fracture plane and in its center (perpendicular screw axis).

RESULTS

The longitudinal axis screw was found to be significantly longer than the other axes (28.3mm). There was a significant difference between the perpendicular axis screw and the location and angle of the other screw axis, but it was only shorter than the longitudinal screw (23.6mm versus 25.5mm for the actual screw; ns.).

CONCLUSIONS

A computed longitudinal axis screw is longer than a central or actual screw placed longitudinally by visual inspection by the surgeon. Although it needs to be placed using computer assisted (CAS) techniques, it may have the biomechanical advantages of a longer screw in a similar trajectory. The perpendicular screw was found to be significantly different in position and angle but not shorter than the actually placed screw. It has biomechanical advantages and does not require visualization with CAS methods, making it the more attractive alternative.

Is there a trend in CT scanning scaphoid nonunions for deformity assessment?-A systematic review

PURPOSE

The effect of scaphoid nonunion deformity on wrist function is uncertain due to the lack of reliable imaging tools. Advanced three-dimensional (3-D) computed tomography (CT)-based imaging techniques may improve deformity assessment by using a mirrored image of the contralateral intact wrist as anatomic reference. The implementation of such techniques depends on the extent to which conventional CT is currently used in standard practice. The purpose of this systematic review of medical literature was to analyze the trend in CT scanning scaphoid nonunions, either unilaterally or bilaterally.

MATERIALS AND METHODS

Using Medline and Embase databases, two independent reviewers searched for original full-length clinical articles describing series with at least five patients focusing on reconstructive surgery of scaphoid nonunions with bone grafting and/or fixation, from the years 2000-2015. We excluded reports focusing on only nonunions suspected for avascular necrosis and/or treated with vascularized bone grafting, as their workup often includes magnetic resonance imaging. For data analysis, we evaluated the use of CT scans and distinguished between uni- and bilateral, and pre- and postoperative scans.

RESULTS

Seventy-seven articles were included of which 16 were published between 2000 and 2005, 19 between 2006 and 2010, and 42 between 2011 and 2015. For these consecutive intervals, the rates of articles describing the use of pre- and postoperative CT scans increased from 13%, to 16%, to 31%, and from 25%, to 32%, to 52%, respectively. Hereof, only two (3%) articles described the use of bilateral CT scans.

CONCLUSION

There is an evident trend in performing unilateral CT scans before and after reconstructive surgery of a scaphoid nonunion. To improve assessment of scaphoid nonunion deformity using 3-D CT-based imaging techniques, we recommend scanning the contralateral wrist as well.

Internal Bone Grafting for the Treatment of Scaphoid Nonunions

Scaphoid fracture is the most common carpal fracture of the upper extremity and a significant proportion of these can eventually progress to nonunion. Excision of pseudoarthrosis and fibrous scar tissue at the nonunion site is regarded as one of the important steps in management of scaphoid nonunions. We describe a technique of internal bone grafting, where curettage of the nonunion site was performed through a drill hole in the scaphoid and bone graft was packed through this same hole before fixation with a headless compression screw. We have been able to achieve a union rate of 86% using this technique. The advantage of the technique is that it does not disturb the external fibrocartilaginous shell that would have formed around the nonunion site, thus leaving the articular surface undisturbed.

Scaphoid Fractures: Nonunion and Malunion

The treatment of scaphoid nonunion and malunions has undergone a considerable transition since the 1960 modification of Matti's technique by Russe.¹ We present a review of articles with clear data on union rates and functional status to review the current methods of treatment for scaphoid nonunion and malunion.

Ilizarov fixation for the treatment of scaphoid nonunion: a novel approach

OBJECTIVES

To evaluate the safety and efficacy of the Ilizarov fine-wire compression/distraction technique in the treatment of scaphoid nonunion (SNU), without the use of bone graft.

DESIGN

This is a prospective study of 20 consecutive patients in one center.

PATIENTS AND METHODS

This study included 20 patients (19 males) with a mean SNU duration of 14.5 months. Four patients had proximal pole, 15 had waist, and 1 had a distal SNU. Patients with carpal instability, humpback deformities, carpal collapse, avascular necrosis, and marked degenerative change were excluded. Following frame application, the treatment comprises three stages: The frame is distracted by 1 mm per day until the radiographs show a 2-3 mm opening at the SNU site (mean 10 days); the SNU site is compressed for 5 days, at a rate of 1 mm per day, with the wrist in 15 degrees of flexion and 15 degrees of radial deviation; the wrist is then immobilized in the Ilizarov fixator for 8 weeks.

RESULTS

Radiographic (radiography and CT scan) and clinical bony union was achieved in all 20 patients after a mean of 90.3 days (70-130 days). All patients returned to their pre-injury occupations. Thirteen patients had excellent results, four good, and three fair, according to the Mayo wrist score.

CONCLUSIONS

In these selected patients, this technique safely achieved bony union without the need to open the SNU site and without the requirement of bone graft.

Scaphoid Proximal Pole Fracture Following Headless Screw Fixation

Background Headless screw fixation of scaphoid fractures and nonunions yields predictably excellent outcomes with a relatively low complication profile. However, intramedullary implants affect the load to failure and stress distribution within bone and may be implicated in subsequent fracture. Case Description We describe a posttraumatic fracture pattern of the scaphoid proximal pole originating at the previous headless screw insertion site in three young male patients with healed scaphoid nonunions. Each fracture was remarkably similar in shape and size, comprised the volar proximal pole, and was contiguous with the screw entry point. Treatment was challenging but successful in all cases. Literature Review Previous reports have posited that stress-raisers secondary to screw orientation may be implicated in subsequent peri-implant fracture of the femoral neck. Repeat scaphoid fracture after screw fixation has also been reported. However, the shape and locality of secondary fracture have not been described, nor has the potential role of screw fixation in the production of distinct fracture patterns. Clinical Relevance Hand surgeons must be aware of this difficult complication that may follow antegrade headless screw fixation of scaphoid fracture nonunion, and of available treatment strategies.

Current concepts for the treatment of acute scaphoid fractures

Fractures of the scaphoid are common injuries, accounting for approximately 80 % of carpal fractures. Differentiation between stable and unstable fractures (Herbert classification) cannot be made with conventional X-rays, so evaluation by computed tomography should additionally be performed. Under most circumstances, minimally invasive surgery with cannulated screws is the treatment of choice. A longer cast immobilization after minimal-invasive surgery is not necessary. Conservative treatment still has a place if the fracture is not dislocated nor unstable, but operative treatment can be offered to reduce the period of cast immobilization. Displaced fractures have a greater risk for nonunion and therefore should be treated operatively. Proximal pole fractures are definitely unstable, requiring treatment with screw fixation. The surgical approach depends on the location of the fracture and the preference of the surgeon.

Fixation and Grafting After Limited Debridement of Scaphoid Nonunions

PURPOSE

To evaluate a surgical technique of treating nondisplaced waist and proximal pole scaphoid nonunions without avascular necrosis (AVN).

METHODS

We performed a retrospective review of all patients with nondisplaced, scaphoid waist or proximal pole nonunions without AVN treated with the following technique. Two K-wires are positioned along the scaphoid axis to stabilize the proximal and distal poles. Debridement with a curette or burr is performed parallel to the nonunion site until the K-wires are visualized and punctate bleeding of the proximal and distal fragments is encountered. The volar, radial fibrous union is left intact. Distal radius cancellous bone graft is packed into the nonunion site. A headless screw is placed perpendicular to the fracture and the K-wires are removed.

RESULTS

Between 2012 and 2014, 12 patients (ages 13-29 y) with clinical and radiographic evidence (10 had computed tomography or magnetic resonance imaging; 2 had radiographs only) of scaphoid nonunion were identified (10 transverse waist and 2 proximal pole fractures). Median interval from injury to surgery was 38 weeks (range, 3 mo to 9 y). Four patients were active smokers and 2 had failed previous iliac crest bone grafting. All patients healed as confirmed by computed tomography. Average time to union was 14 weeks (range, 6-31 wk). Four patients had delayed union requiring a bone stimulator. All patients had resolution of pain and there were no complications.

CONCLUSIONS

The technique described is an effective and efficient method of treating nondisplaced scaphoid nonunions without AVN. We suggest that complete debridement of the nonunion is not essential to achieve union. In addition, pinning the proximal and distal scaphoid poles initially and maintaining the volar fibrous union of the scaphoid nonunion stabilizes the fracture fragments, increasing the technical ease of grafting and fixation.

TYPE OF STUDY/LEVEL OF EVIDENCE

Therapeutic IV.

Compression screw fixation without bone grafting for scaphoid fibrous nonunion

PURPOSE

Bone graft is often recommended as an adjuvant for treatment of scaphoid nonunions. However, recent literature has suggested that fibrous nonunion may be suited to treatment with rigid fixation without bone grafting. This work reported on outcomes of compression screw fixation for established scaphoid fibrous nonunions without bone graft.

METHODS

Fourteen patients underwent surgical compression screw fixation without bone grafting of scaphoid fibrous nonunion between January 1, 2000, and December 31, 2012, with minimum follow-up until the time of clinical and radiographic healing. Fibrous nonunion of the scaphoid was defined as a scaphoid fracture with all of the following features: (1) persistent tenderness, (2) incomplete trabecular bridging on three X-ray views, (3) injury that had occurred at a minimum of 6 months prior to surgery, and (4) identification of fibrous union at the time of surgery. Outcomes were assessed with range of motion assessment, Disability of the Arm, Shoulder and Hand (DASH) scores, and plain radiographs.

RESULTS

Twelve of the 14 patients healed successfully, while two patients required secondary vascularized bone grafting. Both unhealed patients sustained proximal pole fractures and had a duration of ≥1 year from injury to surgery. Average time to healing was 4.4 ± 2.0 months. Average flexion was 73 ± 22° and average extension was 66 ± 22° postoperatively. Average grip strength was 90 ± 25 lbs on the operative side. Mean postoperative pain score was 1.4 (range, 0 to 7). Mean postoperative DASH score was 10.2 (range, 0 to 52). Increasing age and an interval from injury to surgery of >1 year correlated with worse DASH and pain scores.

CONCLUSIONS

Patients with fibrous scaphoid nonunion demonstrated good results with rigid fixation without bone grafting. Increasing age and >1-year interval between injury and surgery resulted in lower self-assessed outcomes.

LEVEL OF EVIDENCE

Therapeutic Level IV, retrospective case series.

Dorsal Plating of Unstable Scaphoid Fractures and Nonunions

Achieving stable fixation of displaced acute and chronic nonunited scaphoid fractures continues to be a challenge for the treating surgeon. The threaded compression screw has been the mainstay of treatment of these fractures for the last 3 decades; however, persistent nonunion after screw fixation has prompted development of new techniques. Recent results of volar buttress plating have been promising. We describe a novel technique of dorsal scaphoid plating. In contrast to volar plating, the dorsal plate is biomechanically more favorable as it utilizes the tension side of the scaphoid bone for dynamic compression. Dorsal scaphoid plating provides a more stable construct than the traditional Herbert screw and mitigates the need for vascular or corticocancellous bone grafting in most cases.

Modified Murray Technique for Carpal Navicular Nonunion

The authors report the results of long-term follow-up in 29 patients treated for non-union of the carpal navicular with a modified Murray technique performed through a lateral approach. Mean patient age at surgery was 22.5 years. Average time from injury to surgery for nonunion was 18 months. In 5 cases, mild signs of osteoarthritis of the radioscaphoid joint (scaphoid nonunion advanced collapse [SNAC] stage I) were present before surgery, and in 2 cases, radiographic signs of avascular necrosis of the proximal nonunion fragment were evident. In all cases, a corticocancellous nonvascularized bone graft taken from the distal part of the ipsilateral radius was used. Mean follow-up was 11.2 years. Nonunion had healed in 93.1% of cases. At follow-up, the 2 patients in whom nonunion had not healed had severe painful osteoarthritis of the wrist (SNAC stage IV). Twenty patients were asymptomatic, and 5 had occasional pain in the wrist. Wrist range of motion was restricted in all patients compared with the contralateral side. Mild osteoarthritis was observed in 6 patients (SNAC stage I). The average Disabilities of the Arm, Shoulder and Hand score was 8.7 of 100. The modified Murray technique is reliable for treating nonunion of the carpal navicular. The union rate is high, and the incidence of wrist osteoarthritis is low compared with other studies. Early diagnosis and treatment of nonunion (a short interval between fracture and surgery) can minimize the risk of degenerative joint disease. Avascular necrosis of the proximal fragment is not an absolute contraindication to surgery.