Twenty questions about scaphoid fractures

Can a Deep Learning Algorithm Improve Detection of Occult Scaphoid Fractures in Plain Radiographs? A Clinical Validation Study

BACKGROUND

Occult scaphoid fractures on initial radiographs of an injury are a diagnostic challenge to physicians. Although artificial intelligence models based on the principles of deep convolutional neural networks (CNN) offer a potential method of detection, it is unknown how such models perform in the clinical setting.

QUESTIONS/PURPOSES

(1) Does CNN-assisted image interpretation improve interobserver agreement for scaphoid fractures? (2) What is the sensitivity and specificity of image interpretation performed with and without CNN assistance (as stratified by type: normal scaphoid, occult fracture, and apparent fracture)? (3) Does CNN assistance improve time to diagnosis and physician confidence level?

METHODS

This survey-based experiment presented 15 scaphoid radiographs (five normal, five apparent fractures, and five occult fractures) with and without CNN assistance to physicians in a variety of practice settings across the United States and Taiwan. Occult fractures were identified by follow-up CT scans or MRI. Participants met the following criteria: Postgraduate Year 3 or above resident physician in plastic surgery, orthopaedic surgery, or emergency medicine; hand fellows; and attending physicians. Among the 176 invited participants, 120 completed the survey and met the inclusion criteria. Of the participants, 31% (37 of 120) were fellowship-trained hand surgeons, 43% (52 of 120) were plastic surgeons, and 69% (83 of 120) were attending physicians. Most participants (73% [88 of 120]) worked in academic centers, whereas the remainder worked in large, urban private practice hospitals. Recruitment occurred between February 2022 and March 2022. Radiographs with CNN assistance were accompanied by predictions of fracture presence and gradient-weighted class activation mapping of the predicted fracture site. Sensitivity and specificity of the CNN-assisted physician diagnoses were calculated to assess diagnostic performance. We calculated interobserver agreement with the Gwet agreement coefficient (AC1). Physician diagnostic confidence was estimated using a self-assessment Likert scale, and the time to arrive at a diagnosis for each case was measured.

RESULTS

Interobserver agreement among physicians for occult scaphoid radiographs was higher with CNN assistance than without (AC1 0.42 [95% CI 0.17 to 0.68] versus 0.06 [95% CI 0.00 to 0.17], respectively). No clinically relevant differences were observed in time to arrive at a diagnosis (18 ± 12 seconds versus 30 ± 27 seconds, mean difference 12 seconds [95% CI 6 to 17]; p < 0.001) or diagnostic confidence levels (7.2 ± 1.7 seconds versus 6.2 ± 1.6 seconds; mean difference 1 second [95% CI 0.5 to 1.3]; p < 0.001) for occult fractures.

CONCLUSION

CNN assistance improves physician diagnostic sensitivity and specificity as well as interobserver agreement for the diagnosis of occult scaphoid fractures. The differences observed in diagnostic speed and confidence is likely not clinically relevant. Despite these improvements in clinical diagnoses of scaphoid fractures with the CNN, it is unknown whether development and implementation of such models is cost effective.

LEVEL OF EVIDENCE

Level II, diagnostic study.

Postoperative Immobilization of Scaphoid Fractures: A Comprehensive Review of the Literature

The optimal protocol for postoperative immobilization following operative treatment of scaphoid fractures remains controversial. Reports of successful management with brief postoperative immobilization suggest that earlier restoration of function may be achieved by limiting the duration of immobilization. However, the risk of nonunion and its associated complications suggest that a more conservative approach with extended immobilization could optimize fracture healing. This paper presents a thorough review of the relevant literature and summarizes the myriad postoperative immobilization protocols and their reported outcomes. Postoperative immobilization protocols and reported outcomes for displaced, comminuted, and proximal pole fractures are discussed separately. The literature is reviewed following different operative techniques, including open reduction internal fixation and percutaneous screw fixation. Vigilant postoperative care of scaphoid fractures managed surgically is warranted to monitor for signs of nonunion while attempting to regain motion and strength to the injured wrist.

Diagnosis of Suspected Scaphoid Fractures

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Suspected scaphoid fractures are a diagnostic and therapeutic challenge despite the advances in knowledge regarding these injuries and imaging techniques. The risks and restrictions of routine immobilization as well as the restriction of activities in a young and active population must be weighed against the risks of nonunion that are associated with a missed fracture.

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The prevalence of true fractures among suspected fractures is low. This greatly reduces the statistical probability that a positive diagnostic test will correspond with a true fracture, reducing the positive predictive value of an investigation.

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There is no consensus reference standard for a true fracture; therefore, alternative statistical methods for calculating sensitivity, specificity, and positive and negative predictive values are required.

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Clinical prediction rules that incorporate a set of demographic and clinical factors may allow stratification of secondary imaging, which, in turn, could increase the pretest probability of a scaphoid fracture and improve the diagnostic performance of the sophisticated radiographic investigations that are available.

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Machine-learning-derived probability calculators may augment risk stratification and can improve through retraining, although these theoretical benefits need further prospective evaluation.

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Convolutional neural networks (CNNs) are a form of artificial intelligence that have demonstrated great promise in the recognition of scaphoid fractures on radiographs. However, in the more challenging diagnostic scenario of a suspected or so-called "clinical" scaphoid fracture, CNNs have not yet proven superior to a diagnosis that has been made by an experienced surgeon.

Comparing Stacking Ensemble Techniques to Improve Musculoskeletal Fracture Image Classification

Bone fractures are among the main reasons for emergency room admittance and require a rapid response from doctors. Bone fractures can be severe and can lead to permanent disability if not treated correctly and rapidly. Using X-ray imaging in the emergency room to detect fractures is a challenging task that requires an experienced radiologist, a specialist who is not always available. The availability of an automatic tool for image classification can provide a second opinion for doctors operating in the emergency room and reduce the error rate in diagnosis. This study aims to increase the existing state-of-the-art convolutional neural networks' performance by using various ensemble techniques. In this approach, different CNNs (Convolutional Neural Networks) are used to classify the images; rather than choosing the best one, a stacking ensemble provides a more reliable and robust classifier. The ensemble model outperforms the results of individual CNNs by an average of 10%.

Scaphoid fractures: A bibliometric analysis of the most influential papers

Scaphoid fractures are commonly seen following a fall on an outstretched hand and often missed on initial presentation. An untreated scaphoid fracture may result in avascular necrosis of the scaphoid due to its retrograde blood supply. Published articles guide our investigation and management of these injuries. A citation analysis was performed on the top 30 articles relating to scaphoid fractures ranked by citation number. The 30 articles have been cited a total of 4595 times originating from 9 different countries. The leading article was cited 443 times with an average of 12.66 citations/year. Although this may not directly correlate with study quality, it does provide an insight to the influence which a paper has had on the scientific community. This list may prove invaluable to clinicians involved in the treatment of patients with scaphoid fractures and those actively furthering the development of the field.

Are Vascularized Periosteal Flaps Useful for the Treatment of Difficult Scaphoid Nonunion in Adults? A Prospective Cohort Study of 32 Patients

PURPOSE

To evaluate clinical and radiological outcomes after surgical treatment of difficult scaphoid nonunion in adults with a vascularized thumb metacarpal periosteal pedicled flap (VTMPF).

MATERIALS AND METHODS

Thirty-two patients at least 18 years old, with scaphoid nonunion and characteristics associated with a poor prognosis, who underwent a VTMPF procedure, were included in this retrospective cohort study with a mean follow-up of 17 months. Factors associated with a poor prognosis were a delay in presentation of over 5 years, the presence of avascular necrosis, and previous nonunion surgery. All patients had at least 1 poor prognostic factor and 25% had 2 or more.

RESULTS

In 30 men and 2 women, the mean age was 36 years (range, 19-56 years). There were 11 type D3 nonunions (Herbert classification) and 15 type D4. Five patients had delayed presentation of over 5 years. Fourteen patients had previously undergone an unsuccessful surgical attempt to treat their nonunion. The patients experienced no postoperative complications. Overall union rate was 97% (31 of 32 patients), with 72% cross-sectional trabecular percentage bridging at 12 weeks. Pain subsided after surgery and patients experienced improvements in both their Quick Disabilities of the Arm, Shoulder, and Hand (QuickDASH) and Modified Mayo Wrist Score (MMWS). Overall 41% and 42% gains in strength and wrist motion, relative to the contralateral normal side, were observed. At final follow-up, there were no differences between the treated and the untreated (healthy) hands, in terms of wrist range of motion, grip, or pinch strength.

CONCLUSIONS

In this study, the use of VTMPF for difficult scaphoid nonunion in adults was associated with good general outcomes.

TYPE OF STUDY/LEVEL OF EVIDENCE

Therapeutic IV.

Arthroscopic Management of Scaphoid Nonunion

Arthroscopic bone grafting (ABG) in difficult scaphoid delayed union and nonunion allows thorough assessment and comprehensive management for scaphoid fracture and its sequelae. It provides a favorable biological environment for bony healing and produces minimal trauma to the soft tissues, aiding in rehabilitation. With adequate training and experience, high union rates and satisfactory clinical outcomes can be achieved. Poor blood supply of the scaphoid is not a contraindication to bone grafting; union rates over 80% have been reported, comparable to other existing surgical methods. This article discusses the rationale, surgical techniques, and results of ABG.

The Management of the Healed Scaphoid Malunion: What to Do?

Successful bone union is only a portion of scaphoid fracture management. Malunion is possible and can alter wrist kinematics, potentially causing wrist pain and accelerated degeneration. Evaluation of scaphoid malunion begins with adequate imaging and understanding of deformity. Treatment includes nonoperative management, reconstruction, or salvage options. Correction of malunion can be obtained with an osteotomy and the use of structural graft to recreate anatomy and restore normal carpal motion. Clinical improvement of symptomatic scaphoid malunion can be reliably obtained with reconstruction, although the natural history and role for intervention in asymptomatic malunions remains unclear.

A Scoring System to Demonstrate the Risk for Bone Injury in Patients with Clinically Suspected or Occult Scaphoid Fracture

BACKGROUND

It is important to diagnose a scaphoid fracture accurately and start the correct treatment in the shortest time possible. However, the fracture of bone may not be visible on x-ray. In such cases, patients are clinically diagnosed with suspected or occult scaphoid fractures. The aim of this study was to define a scoring system based on physical examination to demonstrate the risk for bone injury in patients with clinically suspected and occult scaphoid fractures with negative radiographs and anatomical snuff box tenderness and to decrease the costs and workforce loss due to unnecessary treatment and magnetic resonance imaging (MRI).

MATERIALS AND METHODS

Patients were initially evaluated by the attendant orthopedic physician in the emergency service with X-ray of the wrist, and ten wrist physical examination techniques were used. The X-rays of patients were evaluated by three orthopedic surgeons. Finally sixty patients, who were diagnosed as having no fracture by all three orthopedic surgeon, were included in the study. The wrists of these patients were evaluated with MRI.

RESULTS

There were 46 male (77%) and 14 female (23%) patients with a mean age of 21.5 years (range 7-61 years). About 3.3% had triquetrum fracture, 15% had bone edema in the scaphoid and radius, 18.3% had distal radius fracture, 31.6% had scaphoid fracture, and 31.8% had no bone injury. A scoring system was also proposed. It can be predicted that in the physical examination of the wrist if the total score is higher than 6.5, the probability of fracture is 2.87 (positive likelihood ratio) fold compared to scores below 6.5.

CONCLUSIONS

Proposal of this new scoring system was thought to be useful for predicting the risk for bone injury in patients with clinically suspected scaphoid fractures and making decision regarding therapeutic options.

Treatment of Scaphoid Fractures: European Approaches

Scaphoid fractures account for 2% of all fractures. In Europe, the incidence is 12.4/100,000/y. This article focuses on the European perspective on understanding and management of these injuries. These fractures occur in young, active patients. The aim of treatment is union. Osteoarthritis is almost inevitable if the fracture does not unite. Cast immobilization is the treatment of choice in occult or stable fractures with 90% to 95% healing. Acute/primary surgery may be considered in some patients. The European literature stresses the importance of taking the patient's wishes into consideration after careful counseling about alternative treatment methods.

Long-Term Outcomes of Scaphoid Malunion

Background: The optimal treatment of patients with a scaphoid malunion remains controversial. The long-term outcomes of operative and nonoperative management have not been established. Methods: We conducted a retrospective review of the outcomes of all scaphoid malunions treated at single institution over a 30-year period. This included patients who underwent corrective osteotomy, salvage procedures (ie, dorsal cheilectomy, radial styloidectomy, and scaphoidectomy with midcarpal fusion), and those who refused operative intervention. The Mayo Wrist Score was determined at the time of surgical evaluation. Patient-Rated Wrist Evaluation (PRWE) and Disabilities of the Arm, Shoulder and Hand (QuickDASH) surveys were sent to all patients for long-term follow-up. Results: Seventeen patients had follow-up at a mean 21.4 years (range, 12-30 years). The mean initial lateral intrascaphoid angle was 58°. Of the 17 patients, 11 proceeded with surgery and 6 opted for nonoperative management. A corrective osteotomy was performed in 4 patients. Of the remaining 7 surgical patients, 5 patients underwent procedures such as cheilectomy and radial styloidectomy, whereas 2 patients had a scaphoidectomy with midcarpal fusion. The final mean PRWE and QuickDASH scores for corrective osteotomy, salvage procedures, and nonoperative treatment were 23 and 6, 18 and 10, and 33 and 22, respectively. Conclusion: Long-term outcomes were similar between operative and nonoperative management.

[Combined scaphoid and distal radius fractures in adults]

Although isolated distal radius and scaphoid fractures are common, the combination of both fractures is rare, with a reported frequency between 0.5% and 6%. This rarity is probably due to the fact that both fractures share the same injury mechanism. Published studies are limited, but most patients are males in their 40s and the injuries are typically due to high-energy trauma. In most studies, the distal radius fracture is displaced while the scaphoid fracture is not. Since the functional outcome depends of the severity of the radius fracture, we believe, as do others, that it is logical to fix both fractures with stable devices (i.e., screw fixation for the scaphoid, locking plate for the radius) to allow for early rehabilitation.

Degenerative Changes at the Scaphotrapezial Joint Following Herbert Screw Insertion: A Radiographic Study Comparing Patients with Scaphoid Fracture and Primary Hand Arthritis

One method of Herbert screw insertion is to mobilize the scaphotrapezial joint and insert the screw through the articular surface of the distal scaphoid. Because of concern that this might predispose to osteoarthritis in the scaphotrapezial joint, we have investigated joint space width and the presence of osteophytes adjacent to the scaphotrapezial joint using high definition macroradiography.

Twenty-eight patients with symptomatic primary osteoarthritis of their hands, 23 with a scaphoid fracture successfully treated conservatively and 18 treated with a Herbert screw were studied. The patients with primary osteoarthritis of their hands had more narrowing of the scaphotrapezial joint compared with the other two groups, but patients treated with a Herbert screw had a significantly higher incidence of osteophytosis on the distal scaphoid than the other two groups. With Herbert screw fixation, osteophytosis on the distal scaphoid may cause impingement and pain, and be a predictor of further degenerative joint changes.

A finite element analysis of two novel screw designs for scaphoid waist fractures

The scaphoid is the most often fractured carpal bone. Scaphoid fracture repair with a headless compression screw allows for early functional recovery. The rotational stability of a single screw may be limited, having a potential negative impact on the healing process. Two novel screws have been designed to provide improved rotational stability compared to the existing ones. Using a computational finite element model of a scaphoid osteotomy, we compared the efficacy of one simple screw and the two new screws in restricting inter-fragmentary motion (IFM) in three functional positions of the wrist and as a function of inter-fragmentary compression force. The in-plane IFM was primary rotational and was better restricted by the new screws compared to the conventional one when the inter-fragmentary compression force was below 15-20 N, but provided no clear benefit in total flexion independently of the compression force. To better understand the differences in the non-compressed case, we analyzed the acting moments and investigated the effects of the bending and torsional screw stiffness on IFM. By efficiently restricting the inter-fragmentary shear, the new screws may be clinically advantageous when the inter-fragmentary compression force is partially or completely lost and may provide further benefits toward earlier and better healing of transverse waist fractures of the scaphoid.

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.

The Palpable Scaphoid Surface Area in Various Wrist Positions

PURPOSE

To determine the theoretical amount of surface area available for palpation of the scaphoid in various wrist positions and to provide a guide depicting which wrist position will expose proximal pole, waist, and distal pole fractures.

METHODS

Using 3 fresh-frozen male cadaver wrists, we digitized palpable surface areas (dorsal, volar, and snuffbox) of the scaphoid in several wrist positions. The entire scaphoid was then excised and a digitized 3-dimensional reconstruction of the entire scaphoid was obtained. The 2 images were superimposed and the surface area was calculated

RESULTS

The maximum palpable area of the scaphoid was achieved with the wrist in neutral extension and maximum ulnar deviation and the wrist in maximum flexion and neutral deviation. Neutral wrist extension and ulnar deviation exposed all but the most proximal portion of the proximal pole and the distal pole, which made this the ideal position to detect tenderness from a scaphoid waist fracture and larger proximal pole fractures. Maximum wrist flexion with neutral wrist deviation exposed the entire proximal pole, which made this the ideal position to detect tenderness from a proximal pole scaphoid fracture.

CONCLUSIONS

Wrist position influences the amount of scaphoid surface area available for palpation and should be considered when examining a patient with a suspected scaphoid fracture.

CLINICAL RELEVANCE

The scaphoid should be palpated in 3 anatomic regions with the wrist placed in different positions to maximally expose the anatomical region being palpated.

Titanium template for scaphoid reconstruction

Reconstruction of a non-united scaphoid with a humpback deformity involves resection of the non-union followed by bone grafting and fixation of the fragments. Intraoperative control of the reconstruction is difficult owing to the complex three-dimensional shape of the scaphoid and the other carpal bones overlying the scaphoid on lateral radiographs. We developed a titanium template that fits exactly to the surfaces of the proximal and distal scaphoid poles to define their position relative to each other after resection of the non-union. The templates were designed on three-dimensional computed tomography reconstructions and manufactured using selective laser melting technology. Ten conserved human wrists were used to simulate the reconstruction. The achieved precision measured as the deviation of the surface of the reconstructed scaphoid from its virtual counterpart was good in five cases (maximal difference 1.5 mm), moderate in one case (maximal difference 3 mm) and inadequate in four cases (difference more than 3 mm). The main problems were attributed to the template design and can be avoided by improved pre-operative planning, as shown in a clinical case.

Quantifying scaphoid malalignment based upon height-to-length ratios obtained by 3-dimensional computed tomography

PURPOSE

To determine if 3-dimensional height-to-length (H/L) measurements including coronal plane assessment will improve malalignment detection of scaphoid fractures and to determine if more waist than proximal pole nonunions are malaligned.

METHODS

Computed tomography scans of uninjured wrists (n = 74) were used to obtain 3-dimensional models of healthy scaphoids. These models were used to determine 95% normal ranges of the H/L ratio in standard sagittal and coronal planes in an automated fashion. Subsequently, the H/L ratios of fibrous nonunions (n = 26) were compared with these normal ranges and were classified as either aligned or malaligned.

RESULTS

The mean normal H/L ratio in the sagittal plane was 0.61 (range, 0.54-0.69) and in the coronal plane 0.42 (range, 0.36-0.48). The mean H/L ratios of the nonunions differed from those of the healthy scaphoids in these planes: 0.65 and 0.48, respectively. Based on sagittal plane evaluation of all nonunions, 46% exceeded the normal H/L range versus 54% based on combining sagittal and coronal plane measurements. More waist nonunions (71%) than proximal pole nonunions (22%) exceed the normal H/L range.

CONCLUSIONS

Evaluation of the H/L ratio in the coronal plane provided valuable additional information for the detection of scaphoid deformities. More malaligned cases were found for waist nonunions than for proximal pole nonunions.

CLINICAL RELEVANCE

This method may be a helpful diagnostic tool to detect malalignment and to choose between in situ fixation or reconstruction.

Scaphoid fracture nonunion: correlation of radiographic imaging, proximal fragment histologic viability evaluation, and estimation of viability at surgery: diagnosis of scaphoid pseudarthrosis

PURPOSE

The purpose of this study was to correlate the pre-operative imaging, vascularity of the proximal pole, and histology of the proximal pole bone of established scaphoid fracture non-union.

METHODS

This was a prospective non-controlled experimental study. Patients were evaluated pre-operatively for necrosis of the proximal scaphoid fragment by radiography, computed tomography (CT) and magnetic resonance imaging (MRI). Vascular status of the proximal scaphoid was determined intra-operatively, demonstrating the presence or absence of puncate bone bleeding. Samples were harvested from the proximal scaphoid fragment and sent for pathological examination. We determined the association between the imaging and intra-operative examination and histological findings.

RESULTS

We evaluated 19 male patients diagnosed with scaphoid nonunion. CT evaluation showed no correlation to scaphoid proximal fragment necrosis. MRI showed marked low signal intensity on T1-weighted images that confirmed the histological diagnosis of necrosis in the proximal scaphoid fragment in all patients. Intra-operative assessment showed that 90% of bones had absence of intra-operative puncate bone bleeding, which was confirmed necrosis by microscopic examination.

CONCLUSIONS

In scaphoid nonunion MRI images with marked low signal intensity on T1-weighted images and the absence of intra-operative puncate bone bleeding are strong indicatives of osteonecrosis of the proximal fragment.

The suspected scaphoid injury: resource implications in the absence of magnetic resonance imaging

INTRODUCTION

Undiagnosed and untreated scaphoid fractures have poorer outcomes and many patients are unnecessarily immobilised for prolonged periods of time to avoid missing occult injuries. Magnetic resonance imaging has a high sensitivity and specificity in detecting occult scaphoid fractures, but many units do not routinely use this imaging modality in the diagnostic pathway. We aimed to determine the patterns of suspected scaphoid injuries, report the process of care, and calculate the costs involved in their management.

METHODS

We prospectively identified all adult patients referred to fracture clinic at the Royal Infirmary of Edinburgh with a scaphoid-related injury, between October 2007 and September 2008. Clinical notes were examined retrospectively. We defined three injury groups: true fractures, occult fractures, and suspected scaphoid injuries. We analysed patient demographics, treatment timelines, and the treatment costs involved.

RESULTS

Fracture clinic received 537 scaphoid-related referrals. There were 87 true fractures, 43 occult fractures, and 407 suspected injuries, incurring average treatment costs of £1,173, £773, and £384 respectively. Occult fractures accounted for 33% of all confirmed scaphoid fractures. The majority of scaphoid-related referrals (76%) were never proven to have a scaphoid fracture, and many were unnecessarily immobilised. The costs involved in the treatment of suspected scaphoid injuries were found to be higher than the cost of magnetic resonance imaging (£97).

CONCLUSION

In this group of suspected scaphoid injury, we believe the introduction of an early magnetic resonance imaging protocol would lead to an earlier definitive diagnosis and potentially a more cost-effective service.

Non-operative treatment versus percutaneous fixation for minimally displaced scaphoid waist fractures in high demand young manual workers

BACKGROUND

Managing minimally displaced scaphoid fractures in young individuals doing physically demanding work remains an issue of debate due to duration of immobilisation and time required off work. Therefore, early diagnosis and appropriate treatment are important to avoid short- and long-term consequences. The literature lacks the exact definition of minimally displaced scaphoid waist fractures. The objective of this review article was to discuss nonoperative and minimally invasive treatment (percutaneous screw fixation) for minimally displaced scaphoid waist fractures and to systematically review the literature, focussing on young workers with physically demanding employment.

MATERIALS AND METHODS

We searched for articles through the most commonly used portals using appropriate terminologies to identify the most relevant articles in the English language comparing nonoperative and percutaneous fixation methods for these fractures in patients between 16 and 40 years of age. Strict inclusion and exclusion criteria were observed.

RESULTS

Sixty relevant published articles were found. Twenty-one of these were considered valid for inclusion and comprised five randomised controlled trials, three prospective studies, four systematic reviews, three meta-analyses, and six retrospective studies. These studies provided a reasonable account of information on the managing undisplaced and minimally displaced scaphoid waist fractures, with satisfactory clinical and statistical analysis. However, it was difficult to assess the outcomes of minimally displaced fractures in isolation. Furthermore, few of these studies relied on plain radiographs for assessing union and did not report on patients' work status.

CONCLUSION

Cast treatment has the disadvantages of longer immobilisation time, joint stiffness, reduced grip strength, and longer time to return to manual work. Percutaneous fixation is aimed at reducing damage to the blood supply and soft tissues, allowing early mobilisation of the wrist and early return to manual work. The best available evidence for percutaneous screw fixation versus cast treatment suggests that percutaneous fixation allows a faster time to union by 5 weeks and an earlier return to manual work by 7 weeks, with similar union rates. This systematic review indicates a potential requirement for a prospective randomised controlled trial to compare these two treatment modalities for minimally displaced scaphoid waist fractures in workers with physically demanding jobs in order to objectively assess functional outcomes, time to union and time to return to work.

LEVEL OF EVIDENCE

Level 3.

Use of computed tomography to predict union and time to union in acute scaphoid fractures treated nonoperatively

PURPOSE

To use computed tomography to determine whether factors could be identified to predict union for acute scaphoid fractures treated nonoperatively.

METHODS

We used a radiology database at a tertiary care center to identify scaphoid computed tomography scans performed between 2004 and 2010. We noted fracture location, fracture orientation, translation between fragments, humpback deformity, comminution, cysts, and sclerosis. We determined the associations between imaging variables on union rates and time to achieve union with casting alone in a cohort of 219 patients (mean age, 31 y; 83% males).

RESULTS

Most fractures were scaphoid waist fractures (173 of 219; 79%), of which 178 (81% of total group) were nondisplaced. There were 28 proximal pole fractures (13%) and 18 distal pole fractures (8%). The overall union rate was 95% (207 of 219). The odds of developing a nonunion were increased in fractures with translation (odds ratio, 3.4) or with a humpback deformity (odds ratio, 6.9). The presence of sclerosis or cysts did not correlate with union rates. There was no statistical association between successful union and fracture location, although, given the small number of proximal pole fractures, we were underpowered for this finding. Time to union was longer for proximal pole fractures (113 d) versus distal pole (53 d) and waist fractures (65 d) and for fractures with sclerosis (166 vs 67 d) or comminution (103 vs 66 d).

CONCLUSIONS

We were able to identify a number of features that contributed to risk of nonunion or delayed union based on computed tomography scan. Factors such as fracture translation, comminution, and humpback were related to a higher risk of scaphoid nonunion. Factors such as sclerosis, comminution, translation, and location in the proximal pole were associated with longer times to union. These variables were independently significant in increasing the time required to achieve union and were shown to have an overall additive effect.

TYPE OF STUDY/LEVEL OF EVIDENCE

Prognostic II.

Determining the Incidence of Adult Fractures: How Accurate Are Emergency Department Data?

Various research methods have been used to obtain skeletal fracture data and report the incidence of fractures. A large number of British studies have used data collected in emergency departments, and not data derived from orthopaedic units. We hypothesised that fracture data will differ depending upon the methodology employed to capture it. Two commonly used sources of fracture data at our institution were compared, (the Emergency Department (ED) database and the Orthopaedic Trauma Unit (OTU) database), using a cohort of adult patients from our defined population as the study sample. We performed univariate analyses to identify differences between groups with accurate and inaccurate ED fracture diagnoses. We then performed a binary logistic regression analysis to determine the best predictors of diagnostic accuracy. In one year, 7,449 patients were referred to the OTU. Three-quarters were referred with fractures. The overall false positive fracture referral rate was 25%. Several fracture subtypes were commonly overdiagnosed in the ED. Regression analysis showed that patient age, patient gender, and the seniority of the referring clinician were independently predictive of an accurate fracture diagnosis. We suggest that studies making use of ED fracture data may potentially overestimate the incidence of adult fractures.

Scaphoid fracture in the elderly: a review

Although scaphoid fractures are relatively common encounters in orthopaedic and trauma surgery, the demographics of these injuries are not well studied. The classical teaching in the subject limits scaphoid fractures in the age between ten and 60 years (or 70 years in other sources). The incidence or the prevalence of scaphoid fractures in the elderly population is not focused on and not studied or explored. We reviewed the literature for any available epidemiological studies of scaphoid fractures. We also sought the available data of scaphoid fractures in the elderly population in case series and case reports which have relevant data on the subject. Four epidemiological studies, two case series, and one case report are included. We discuss the available data in these articles and conclude that scaphoid fractures in the elderly, although rare, have been reported. However, there are not enough epidemiological studies to draw figures. Ignorance of this proportion of population could result in missed fractures in the elderly. Therefore, we encourage researchers to carry out epidemiological studies of scaphoid fractures with more focus on this population group.

Early CT for suspected occult scaphoid fractures

In this study, the use of computed tomography (CT) early in the management of suspected occult scaphoid fractures was evaluated. We retrospectively reviewed the notes and radiology of patients who had scaphoid CT scans over the preceding 3 years. Eighty-four patients that had CT scans within 14 days from injury were identified. Of the CT scans, 64% (n = 54) excluded a fracture and these patients were promptly mobilized. No patients returned with any complications from this management. Overall, 36% of CT scans were abnormal (n = 30), 7% revealed occult scaphoid fractures, 18% revealed occult carpal fractures of the triquetrum, capitate, and lunate, respectively, and 5% revealed distal radius fractures. All patients diagnosed with fractures were successfully managed with plaster immobilization and there was one case of complex regional pain syndrome. Early CT alters therapeutic decision making in suspected occult fractures preventing unnecessary immobilization in a working population without increase in cost.

Acutrak versus Herbert screw fixation for scaphoid non-union and delayed union

PURPOSE

To compare the treatment outcome of Acutrak versus Herbert screw fixation for scaphoid non-union and delayed union.

METHODS

Records of 132 patients who underwent Herbert screw fixation (n=61) or Acutrak screw fixation (n=71) with or without bone grafting for scaphoid non-union and delayed union by a single surgeon were reviewed. The most common fracture site was the waist of the scaphoid (n=95), followed by the proximal pole (n=31) and the distal pole (n=6). Screw placement was considered accurate (n=120) when the screw was placed in the central one-third (axially) of the scaphoid; otherwise it was eccentric (n=12). Bone union was assessed radiographically and clinically. Functional outcome was assessed using the modified Mayo wrist score.

RESULTS

Respectively in the Herbert and Acutrak screw groups, the mean patient ages were 25.3 and 27.3 years (p=0.28), the mean intervals between injury and screw fixation were 12.2 and 17 months (p=0.38), the mean durations to bone union were 2.1 and 1.8 months (p=0.63), and the union rates were 77% and 93% (p=0.01). The union rate was significantly higher in fractures of the waist of the scaphoid than in the proximal and distal poles (94% vs. 71% vs. 33%, p=0.001). The union rate was significantly higher when the screw was placed accurately (axially) than eccentrically (Herbert screw: 84% vs. 40%, p=0.006; Acutrak screw: 96% vs. 0%, p=0.004). 84% of the Herbert screws were placed axially, compared to 97% for the Acutrak screws. Respectively, 67% and 85% of patients had satisfactory functional outcomes (p=0.03), whereas 23% and 7% of the patients had persistent non-union (p=0.05).

CONCLUSION

The Acutrak screw enabled more accurate screw placement and achieved higher union rates and modified Mayo wrist scores than the Herbert screw did.

'Clinical scaphoid fracture': is it time to abolish this phrase?

INTRODUCTION

Most patients with post-traumatic painful wrists and negative radiographs are treated as having a clinical scaphoid fracture. Such cases are usually followed up with repeat radiographs. If the radiographs are inconclusive further imaging is done. However, this traditional approach results in the vast majority of patients being unnecessarily immobilised for an unspecified period, leading to loss of productivity and income to the patient and the community. A number of studies have highlighted the use of early CT or MRI scans to identify these fractures. The aim of this study was to evaluate our current practice in managing patients with suspected fractures of the scaphoid.

PATIENTS AND METHODS

A retrospective audit was carried out. The period studied was from January to August 2008. Fifty consecutive patients who were investigated for occult fractures of the scaphoid were included.

RESULTS

92% of the patients studied had a repeat radiograph in the fracture clinic. 84% of the patients had their wrists immobilised in a cast while awaiting further imaging. Only 6% had confirmed fracture of the scaphoid; all of these healed uneventfully. 76% of patients with negative scans had their wrists immobilised for an average period of 30.63 days.

CONCLUSIONS

It is time we rethink this dogmatic approach to patients with clinical signs but negative radiographs. We recommend that patients with a painful wrist following an injury and negative radiographs should be referred early to an appropriate clinician and earlier recourse to advanced imaging should be advocated.

Displaced fracture of the waist of the scaphoid

A displaced fracture of the scaphoid is one in which the fragments have moved from their anatomical position or there is movement between them when stressed by physiological loads. Displacement is seen in about 20% of fractures of the waist of the scaphoid, as shown by translation, a gap, angulation or rotation. A CT scan in the true longitudinal axis of the scaphoid demonstrates the shape of the bone and displacement of the fracture more accurately than do plain radiographs. Displaced fractures can be treated in a plaster cast, accepting the risk of malunion and nonunion. Surgically the displacement can be reduced, checked radiologically, arthroscopically or visually, and stabilised with headless screws or wires. However, rates of union and deformity are unknown. Mild malunion is well tolerated, but the long-term outcome of a displaced fracture that healed in malalignment has not been established.

This paper summarises aspects of the assessment, treatment and outcome of displaced fractures of the waist of the scaphoid.

Percutaneous screw fixation without bone grafting for established scaphoid nonunion with substantial bone loss

Ununited fractures of the scaphoid with extensive bone resorption are usually treated by bone grafting and internal fixation, using either an open or a minimally invasive technique. We studied the feasibility of percutaneous fixation without bone grafting in a consecutive series of 27 patients with established nonunion of an undisplaced fracture of the scaphoid and extensive local resorption of bone. They were treated by a single surgeon with rigid fixation alone, using a headless cannulated screw inserted through a volar percutaneous technique. Clinical examination, standard radiographs and CT confirmed that the fracture had united in all patients at a mean of 11.6 weeks (8 to 16), and that their functional scores had improved.

We concluded that extensive resorption at the fracture site is not an absolute indication for bone grafting, and that percutaneous fixation alone will eventually produce healing of ununited undisplaced fractures of the scaphoid regardless of the size of the gap.

Assessment of the suspected fracture of the scaphoid

A suspected fracture of the scaphoid remains difficult to manage despite advances in knowledge and imaging methods. Immobilisation and restriction of activities in a young and active patient must be balanced against the risks of nonunion associated with an undiagnosed and undertreated fracture of the scaphoid.

The assessment of diagnostic tests for a suspected fracture of the scaphoid must take into account two important factors. First, the prevalence of true fractures among suspected fractures is low, which greatly reduces the probability that a positive test will correspond with a true fracture, as false positives are nearly as common as true positives. This situation is accounted for by Bayesian statistics. Secondly, there is no agreed reference standard for a true fracture, which necessitates the need for an alternative method of calculating diagnostic performance characteristics, based upon a statistical method which identifies clinical factors tending to associate (latent classes) in patients with a high probability of fracture.

The most successful diagnostic test to date is MRI, but in low-prevalence situations the positive predictive value of MRI is only 88%, and new data have documented the potential for false positive scans. The best strategy for improving the diagnosis of true fractures among suspected fractures of the scaphoid may well be to develop a clinical prediction rule incorporating a set of demographic and clinical factors which together increase the pre-test probability of a fracture of the scaphoid, in addition to developing increasingly sophisticated radiological tests.

Assessment of scaphoid fracture healing

Scaphoid fractures are among the most common hand fractures in adults. The geometry of the scaphoid as it relates to its retrograde blood supply renders it particularly prone to avascular necrosis and other fracture complications. Though there has been long-standing debate over the optimal method of diagnosing scaphoid fractures, the best and most cost-effective methods combine clinical exam with other imaging modalities such as navicular view plain films, CT, and MRI for particularly questionable presentations. Once a scaphoid fracture is diagnosed, it should be followed by an orthopaedic surgeon and treated with cast immobilization or operative management in the case of displaced fractures. Fractures should be followed to monitor healing progress in order to ensure the eventual development of bridging bone across the fracture line, usually best appreciated on CT. Proper treatment of scaphoid fractures and assessment of fracture healing can minimize the occurrence of non-unions and associated arthritic changes.

Acute scaphoid fracture: a review

The scaphoid is by far the most commonly fractured carpal bone. Occult fractures, imperceptible on initial radiographs and a reputation for non-union make diagnosis and management challenging. The past few years have seen significant advances in the assessment and surgical treatment of scaphoid fractures. This article reviews the published literature relating to acute scaphoid fractures and examines the advances that have been made in management.

Examination tests predictive of bone injury in patients with clinically suspected occult scaphoid fracture

BACKGROUND

This study aims to identify the physical examination tests most indicative of bone injury in patients with clinically suspected occult scaphoid fractures.

METHODS

Ten physical examination manoeuvres were performed on 41 patients with a history of a fall on an outstretched hand and tenderness at the anatomical snuffbox and scaphoid tubercle without a radiographically visible fracture line. The results of wrist examination and subsequent magnetic resonance imaging (MRI) were recorded. The sensitivity, specificity, positive and negative predictive values, accuracy and likelihood ratio of the physical examinations were calculated for the patients who had bone injury confirmed by MRI.

RESULTS

The distribution of MRI-confirmed conditions was as follows: 13 cases-no bone involvement; 12 cases-scaphoid fractures; 9 cases-fissures at the distal end of the radius; 6 cases-bone-bruise and 1 case-triquetral fracture. The symptoms most indicative of bone injuries were 'pain during pinching by the thumb and index fingers' and 'pain during pronation of the forearm'.

CONCLUSION

The two above-mentioned manoeuvres were most indicative of bone injury in patients with clinically suspected occult scaphoid fracture. These examinations may reduce the number of unnecessary MRI examinations.

Survey of the initial management and imaging protocols for occult scaphoid fractures in UK hospitals

OBJECTIVE

The aim of this research was to survey how occult fractures of the scaphoid bone are both imaged and managed initially.

MATERIALS AND METHODS

A total of 832 questionnaires were sent via e-mail to active associate members of the British Orthopaedic Association. Included was a series of questions regarding the timing of initial and subsequent orthopaedic review of this group of patients and the use of serial radiographs and second-line imaging techniques.

RESULTS

Nearly half of the UK's acute NHS trusts were represented (45%). The response rate was 16% (130 out of 832). Only 16% of respondents were aware of a local imaging protocol for the investigation of suspected fractures of the scaphoid. Ninety-four percent of respondents performed a second radiograph at first fracture clinic review. Fifty-eight percent used magnetic resonance imaging (MRI) as a second-line investigation; with computed tomography scan and radionuclide isotope bone scan being performed by 26% and 16% respondents, respectively.

CONCLUSIONS

The survey revealed a wide variation in the management of occult fractures of the scaphoid. MRI has been shown to be both sensitive and specific in diagnosing occult carpal bone fractures. There is a need to standardise the management of these injuries to ensure early diagnosis and limit unnecessary wrist immobilisation.

Treatment for scaphoid fracture and nonunion--the application of 3.0 mm cannulated screws and pedicle vascularised bone grafts

SUMMARY BACKGROUND

Scaphoid fractures are very common in wrist trauma, and scaphoid nonunions with avascular necrosis are frequent complications of a fractured scaphoid. The purpose of these two retrospective studies was to examine the clinical and x-ray results of treatments for acute scaphoid fracture and scaphoid nonunion. The surgical techniques of cannulated screw fixation and pedicled vascularised bone graft are described.

METHODS

From 2001-2004, 80 patients with scaphoid fractures were treated with 3.0 mm cannulated screws and 5.5 mm threaded washers in our hospitals. The average age was 35 years, and the average time from injury to surgery was 16.5 hours. Outcomes were assessed by x-ray and the modified Mayo wrist score system. During the 6-year period of 1998-2004, 72 patients with scaphoid nonunions were treated using pedicled vascularised bone graft (VBG)in our hospitals. The average age was 38.5 years, and the average time from injury to surgery was 9.5 months.

RESULTS

The union rate was 96.25% and satisfactory function rate was 93.75% in acute scaphoid fractures with an average follow-up of 3.5 years. The union rate (90.28%) and satisfactory function rate (81.94%) achieved in scaphoid nonunions were acceptable, with an average follow-up of 5 years.

CONCLUSIONS

Our studies suggested that appropriate application of a cannulated screw and threaded washer was able to produce satisfactory results in scaphoid fracture, and that pedicled vascularised bone graft was effective for treating scaphoid nonunion.

Minimal invasive screw fixation and early mobilization of acute scaphoid fractures in the middle third: operative technique and early functional outcome

Fractures of the scaphoid are relatively common injuries. Differentiation between stable and unstable fractures (Herbert classification) cannot always be made with conventional radiographs and should be additionally evaluated by computed tomographic scan. Under most circumstances, minimal invasive surgery with cannulated screws is currently the treatment of choice. Cast immobilization is not necessary. This article describes the technique of fracture fixation in the middle third of the scaphoid from a palmar approach and early functional outcomes. The outcome assessment included measurement of active range of motion as well as grip strength and the Disability of the Arm, Shoulder and Hand questionnaire as a measurement of activities of daily living. Fifty-four patients with acute scaphoid fractures were treated with minimal invasive screw fixation between April 2001 and January 2005. All patients in this retrospective study received a preoperative computed tomographic scan before surgery. Bony consolidation was found in 52 cases after 6 weeks; 2 patients required reosteosyntheses. The results demonstrate that minimal invasive screw fixation leads to satisfying functional outcomes within a few weeks.

The clinical scaphoid fracture: early computed tomography as a practical approach

INTRODUCTION

Up to 40% of scaphoid fractures are missed at initial presentation as clinical examination and plain radiographs are poor at identifying scaphoid fractures immediately after the injury. Avoiding a delay in diagnosis is essential to prevent the risk of non-union and early wrist arthritis. We demonstrate the use of CT scanning for the early confirmation of a scaphoid fracture.

PATIENTS AND METHODS

We conducted a retrospective, chronological review of patients who attended an upper limb fracture clinic from January 2001 to October 2003 in a small district general hospital. We performed a CT scan on all 'clinical scaphoid' patients who had negative plain X-ray films.

RESULTS

Overall, 70% of patients had a CT scan within 1 week of injury and not from date of accident and emergency attendance; 83% of patients had a CT scan within 2 weeks of injury. Of 118 patients identified, 32% had positive findings and 22% of 'clinical scaphoid' patients had scaphoid fractures. The proportion of positive findings for an acute scaphoid fracture was 68%. Additional pathologies identified on CT were capitate, triquetral and radial fractures.

CONCLUSIONS

Our audit shows that it is practical to perform CT on suspicious scaphoid fractures in a small district general hospital. We identified an extremely high false-negative rate for plain X-rays and demonstrate that the appropriate use of CT at initial fracture clinic attendance with 'clinical scaphoid' leads to an earlier diagnosis and reduces the need for prolonged immobilisation and repeated clinical review.

Nonoperative compared with operative treatment of acute scaphoid fractures. A randomized clinical trial

BACKGROUND

Traditionally, acute nondisplaced scaphoid fractures have been treated nonoperatively in a cast, and the expected union rate approaches 90%. Internal fixation of nondisplaced scaphoid fractures has increased in popularity, and a union rate of 100% has been reported. The growing trend is to recommend internal fixation for the majority of acute scaphoid fractures. The true long-term benefits of this more complicated treatment modality have not yet been determined in randomized controlled trials. The purpose of this study was to compare the long-term results of operative fixation of acute scaphoid fractures with those of nonoperative treatment.

METHODS

During the period between 1992 and 1997, eighty-three patients with an acute nondisplaced or minimally displaced scaphoid fracture were randomly allocated to, and received, either nonoperative treatment with a cast or internal fixation with a Herbert screw. At a median of ten years after the injury, seventy-five (93%) of the eighty-one patients who were still alive were assessed clinically and radiographically.

RESULTS

All fractures united. A significant increase in the prevalence of osteoarthritis in the scaphotrapezial joint was found in the operatively treated group. No differences in subjective symptoms, as measured with limb-specific outcome scores, were found between the two groups. The range of motion and grip strength were greater, but not significantly greater, in the nonoperatively treated group.

CONCLUSIONS

This study did not demonstrate a true long-term benefit of internal fixation, compared with nonoperative treatment, for acute nondisplaced or minimally displaced scaphoid fractures. The long-term risks of surgery should be considered when recommending operative treatment.

Arthroscopic-assisted percutaneous reduction and screw fixation of displaced scaphoid fractures

Many scaphoid fractures can be treated with percutaneous screw insertion, but fracture displacement usually necessitates open reduction. Two surgeons treated 20 consecutive patients with displaced fractures of the scaphoid using arthroscopic-assisted percutaneous screw fixation. Thirteen patients had dorsal (antegrade) and seven had palmar (retrograde) percutaneous screw insertion. At an average follow-up of 18 (range 6-48) months, all of the fractures were healed and there were no implant problems. The early results of arthroscopic-assisted percutaneous screw fixation of displaced fractures of the scaphoid suggest that union can be obtained and good to excellent function achieved predictably without the need for open exposure. Avoidance of an open exposure limits wrist ligament injury and may preserve blood supply. Further evaluation of this procedure is merited.

Percutaneous screw fixation versus conservative treatment for fractures of the waist of the scaphoid: a prospective randomised study

We randomly allocated 60 consecutive patients with fractures of the waist of the scaphoid to percutaneous fixation with a cannulated Acutrak screw or immobilisation in a cast. The range of movement, the grip and pinch strength, the modified Green/O'Brien functional score, return to work and sports, and radiological evidence of union were evaluated at each follow-up visit. Patients were followed sequentially for one year. Those undergoing percutaneous screw fixation showed a quicker time to union (9.2 weeks vs 13.9 weeks, p < 0.001) than those treated with a cast. There was a trend towards a higher rate of nonunion in the non-operative group, although this was not statistically significant. Patients treated by operation had a more rapid return of function and to sport and full work compared with those managed conservatively. There was a very low complication rate. We recommend that all active patients should be offered percutaneous stabilisation for fractures of the waist of the scaphoid.

The role of MR imaging in scaphoid disorders

The scaphoid bone of the wrist is one of the most commonly fractured bones in the body. Due to its importance in the biomechanics and functionality of the wrist, it is important to depict and characterize the type of injury. Plain radiographs and scintigraphy may fail to disclose the type and severity of the injury. In patients with normal initial plain radiographs, MR imaging can discriminate occult fractures from bone bruises and may also demonstrate ligamentous disruption. MR imaging can also discriminate the proximal pole viability versus avascular necrosis secondary to previous fracture, which is important for treatment planning. Treatment of non-united fractures with vascularized grafts can be evaluated with contrast-enhanced MR imaging. Idiopathic osteonecrosis or Preiser's disease was originally described after trauma. The non-traumatic disorders of the scaphoid include post-traumatic osteoarthritis, inflammatory bone marrow edema in patients with rheumatoid arthritis, and osteomyelitis. MR imaging is helpful in all the above disorders to demonstrate early bone marrow edema, cartilage degeneration and associated subchondral marrow changes. The most commonly found tumors in the scaphoid are usually benign and include enchondroma, osteoblastoma and osteoid osteoma. MR imaging is not mandatory for the initial diagnosis, which should be based on plain X-ray findings.

High-resolution MRI of the triangular fibrocartilage complex (TFCC) at 3T: Comparison of surface coil and volume coil

PURPOSE

To evaluate high-resolution MRI of the triangular fibrocartilage complex (TFCC) at 3T using a surface coil (SC) or volume coil (VC).

MATERIALS AND METHODS

MRI was obtained from nine volunteers in the supine position with a 3-inch SC and in prone position with a transmit-receiver wrist VC at 3 T. Coronal two-dimensional-gradient echo (2D-GRE) images (TR/TE/FA = 500 msec/15 msec/40 degrees , 1 mm slice-thickness, 60 mm field of view [FOV], 192 x 256 matrix) and coronal 3D-GRE images (TR/TE/FA = 33 msec/15 msec/10 degrees , 0.8 mm slice-thickness, 80 mm FOV, 256 x 256 matrix) were used. Signal-to-noise ratio (SNR) and contrast-to-noise ratio (CNR) of the TFCC and surrounding structures were measured. For qualitative measurement, visualization of TFCC and intercarpal ligaments was graded.

RESULTS

SNR of TFCC, cartilage, and bone marrow on 2D-GRE with SC/VC was as follows: 5.3/5.3 (TFCC), 16.5/14.4 (cartilage), and 3.61/3.96 (bone marrow). 3D-GRE showed similar SNR. Cartilage-TFCC/cartilage-bone marrow CNR were 11.1/12.8 (SC-2D-GRE), 8.8/10.5 (VC-2D-GRE), 14.1/15.5 (SC-3D-GRE), and 11.9/15.0 (VC-3D-GRE). Quantitative values were not significantly different between SC and VC. Visualization of TFCC and intercarpal ligament with SC was superior to that with VC. All structures show higher scores with 3D-GRE imaging compared to 2D-GRE imaging.

CONCLUSION

SC may provide superior qualitative and quantitative results and can be an alternative in case of difficulty in prone position at 3T.