Reliability of a digital radiographic system in measuring distal radial fracture displacement parameters

Computer-Generated Radiographic Measurements of Distal Radius Fractures: Does It Help With Decision Making?

PURPOSE

Operative management of distal radius fractures (DRFs) has become increasingly common. Age, activity levels, and comorbid conditions are major factors influencing the treatment decision, although operative indications are still controversial. Radiographic parameters (RPs), such as radial inclination, dorsal tilt, and articular step-off, can provide objective support for effective decision making. However, manual measurement of RPs may be imprecise and subject to inconsistency. To address this problem, we developed custom software of an algorithm to automatically detect and compute 6 common RPs associated with DRF in anteroposterior and lateral radiographs. The aim in this study was to assess the effect of this software on radiographic interobserver variability among orthopedic surgeons. Our hypothesis was that precise and consistent measurement of RPs will improve radiographic interpretation variability among surgeons and, consequently, may aid in clinical decision making.

METHODS

Thirty-five radiograph series of DRFs were presented to 9 fellowship-trained hand and orthopedic trauma surgeons. Each case was presented with basic clinical information, together with plain anteroposterior and lateral radiographs. One of the 2 possible treatment options was selected: casting or open reduction with a locking plate. The survey was repeated 3 weeks later, this time with computer-generated RP measurements. Data were analyzed for interobserver and intraobserver variability for both surveys, and the interclass coefficient, kappa value, was calculated.

RESULTS

The interobserver reliability (interclass coefficient value) improved from poor to moderate, 0.35 to 0.50, with the provided RP. The average intraobserver interclass coefficient was 0.68. When participants were assessed separately according to their subspecialties (trauma and hand), improved interobserver variability was found as well.

CONCLUSIONS

Providing computed RPs to orthopedic surgeons may improve the consistency of the radiographic judgment and influence their clinical decision for the treatment of DRFs.

CLINICAL RELEVANCE

Orthopedic surgeons' consistency in the radiographic judgment of DRFs slightly improved by providing automatically calculated radiographic measurements to them.

Automated computation of radiographic parameters of distal radial metaphyseal fractures in forearm X-rays

PURPOSE

Radiographic parameters (RPs) provide objective support for effective decision making in determining clinical treatment of distal radius fractures (DRFs). This paper presents a novel automatic RP computation pipeline for computing the six anatomical RPs associated with DRFs in anteroposterior (AP) and lateral (LAT) forearm radiographs.

METHODS

The pipeline consists of: (1) segmentation of the distal radius and ulna bones with six 2D Dynamic U-Net deep learning models; (2) landmark points detection and distal radius axis computation from the segmentations with geometric methods; (3) RP computation and generation of a quantitative DRF report and composite AP and LAT radiograph images. This hybrid approach combines the advantages of deep learning and model-based methods.

RESULTS

The pipeline was evaluated on 90 AP and 93 LAT radiographs for which ground truth distal radius and ulna segmentations and RP landmarks were manually obtained by expert clinicians. It achieves an accuracy of 94 and 86% on the AP and LAT RPs, within the observer variability, and an RP measurement difference of 1.4 ± 1.2° for the radial angle, 0.5 ± 0.6 mm for the radial length, 0.9 ± 0.7 mm for the radial shift, 0.7 ± 0.5 mm for the ulnar variance, 2.9 ± 3.3° for the palmar tilt and 1.2 ± 1.0 mm for the dorsal shift.

CONCLUSION

Our pipeline is the first fully automatic method that accurately and robustly computes the RPs for a wide variety of clinical forearm radiographs from different sources, hand orientations, with and without cast. The computed accurate and reliable RF measurements may support fracture severity assessment and clinical management.

A comparison of sugar-tong and volar-dorsal splints for provisional immobilization of distal radius fractures in the adult population

INTRODUCTION

Distal radius fractures are extremely common injuries affecting a wide range of patient demographics. The purpose of this study was to evaluate the outcomes of distal radius fractures managed initially with closed reduction and immobilization in either a below elbow volar-dorsal splint versus sugar-tong splint prior to conversion into a short arm cast.

METHODS

We performed a retrospective study of patients with distal radius fractures placed in a sugar-tong (n = 45) and volar-dorsal splint (n = 36). Anteroposterior and lateral radiographs were evaluated immediately after closed reduction and placement into either a sugar-tong or volar-dorsal splint. The radial inclination, radial length, volar tilt, and intra-articular displacement were measured.

RESULTS

The average age was not significantly different between groups (Diff: 1.1 years, P = 0.8766). Initial clinic follow-up radiographs illustrated significantly lower radial inclination in the sugar-tong group than volar-dorsal group (17.1 vs. 19, P = 0.0443). Follow-up mean radial length was not significantly lower in the sugar-tong than volar-dorsal group (8.4 vs. 9.2, P = 0.0858). Palmar tilt and articular step-off was not significantly different between splint types. The loss of reduction was 28.8% for the sugar-tong and 25.0% for the volar-dorsal group (P = 0.696).

CONCLUSION

Our results did not demonstrate a significant difference in loss of reduction rates between the two splint groups. There was no significant difference between the sugar-tong and volar-dorsal groups in terms of loss of radial length and volar tilt. Loss of reduction was similar between groups suggesting no advantage of a volar-dorsal splint compared to a sugar-tong splint.

LEVEL OF EVIDENCE

Therapeutic level III.

Reliability and clinical importance of teardrop angle measurement in intra-articular distal radius fracture

PURPOSE

The teardrop angle (TDA) is a newly characterized radiographic parameter that some authors propose as an indicator of articular incongruity of the lunate facet. The purposes of this study were to investigate intra-observer and interobserver reliability of the measurements of the TDA and to determine whether the TDA is a reliable indicator of articular step and gap formation after distal radius fracture.

METHODS

We studied radiographs of 24 uninjured wrists and 24 wrists with intra-articular distal radius fractures. On standard and 10° tilt views of lateral wrist radiographs, the teardrop represents the volar rim of the lunate facet, and the TDA is defined as the angle between the central axis of the teardrop and the radial shaft. We examined interobserver and intra-observer reliability for 3 observers using the intraclass correlation coefficient (ICC) for measurements of the uninjured and fractured wrists. For subjects with fractures, we determined correlation of the TDA-volar tilt with the articular step and gap measured by computed tomography using simple linear regression.

RESULTS

There was almost perfect intra-observer (ICC = 0.95) and interobserver (ICC = 0.93) reliability in the fractured wrists. We observed substantial intra-observer (ICC = 0.64) and fair interobserver (ICC = 0.28) reliability in the uninjured wrists on the standard lateral radiographs. On the 10° tilt views, intra-observer and interobserver reliability in the uninjured wrists increased to substantial levels (ICC = 0.76 and 0.61, respectively). The TDA-volar tilt was significantly associated with articular step and gap on computed tomography.

CONCLUSIONS

The TDA, measured on the lateral radiograph of the wrist, exhibits higher intra-observer and interobserver reliability in fractured wrists compared with uninjured wrists. On the 10° tilt views, the reliability increased in the uninjured wrists. Measurement of the TDA in plain radiographs may allow direct estimation of articular incongruity as seen on sagittal computed tomography reconstruction images.

The reliability and reproducibility of the Neer classification system--digital radiography (PACS) improves agreement

INTRODUCTION

We investigated if the introduction of digital radiography, with its software permitting enhancement of plain radiographs, improved inter- and intra-observer agreement in the Neer classification.

METHODS

Five observers participated in classifying 50 randomly selected radiographs with a confirmed proximal humeral fracture. The observers included a junior registrar, an upper-limb fellow, a lower-limb orthopaedic consultant and two orthopaedic shoulder consultants. Agreement was quantified via kappa values.

RESULTS

In general, good (0.61-0.80) results were obtained using kappa value for inter-observer reliability throughout all grades. On further analysis, however, discrepancies persist in the classification between Neer type 1/2 and Neer type 5 categories. The latter was not restricted to more inexperienced surgeons. Intra-observer agreement (> 0.81) was excellent throughout all grades.

CONCLUSION

The introduction of digital radiography aids the improvement of Neer classification of proximal humeral fractures across all grades. With superior agreement in displacement and fracture patterns, improved communication and discussion of these injuries and similar treatment plans can be expected. This may help negate one aspect of the variability in outcome of proximal humeral shaft fractures. More complex fracture configurations continue to have difficulty in interpretation and may require further imaging analysis to conclude definitively.