Positioning of longest axis of the radial head in neutral forearm rotation

Deschrijver, Miguel; Lamquet, Simon; Planckaert, Guillaume; Vermue, Hannes; Wilde, Lieven De; Tongel, Alexander Van

doi:10.1177/1758573219831285

Cited by 7 publications

(5 citation statements)

References 8 publications

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“…However, they did not include the SD of 8°, described by Hutchinsons et al (11). We included the SD of 14° described by Deschrijver et al (7). Next, they also assumed the maximum supination is 85°.…”

Section: Resultsmentioning

confidence: 99%

“…This combination of axial load, valgus force, and rotation can result in disruption of the lateral collateral ligament. This ligamentous with a statistical analysis that the radial head is not in a neutral position but in 33° pronation (SD 14°) when LARH is perpendicular to the PRUJ (7). The data from Deschrijver et al was used to calculate the position the radial head was scanned.…”

Section: Resultsmentioning

confidence: 99%

“…After that, the rotational position of the forearm was determined according to the technique described by Deschrijver et al (7). To use this technique, the shape of the radial head (circular or elliptical) needs to be evaluated.…”

Section: Methodsmentioning

confidence: 99%

“…The angulation between LARH and the PRUJ plane can be used to evaluate the orientation of the scanned forearm. Deschrijver et al discovered the radius is located in 33° pronation (SD 14°) when LARH is perpendicular to PRUJ (7).…”

Section: Methodsmentioning

confidence: 99%

“…However, this knowledge is necessary to describe the location of the fracture fragments of the radial head in a standardized way. Deschrijver et al described a new technique to calculate an elliptical radial head pro-supination position using the longest axis (LARH) and the proximal radio-ulnar joint (PRUJ) (7).…”

Section: Introductionmentioning

confidence: 99%

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Radial head fractures: a quantitative analysis

Lampaert¹,

Herregodts²,

Wilde³

et al. 2022

Acta Orthop Belg

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Several classification systems for radial head fractures discuss the number of fragments and their displacement, but not the exact location. This study aimed to evaluate the location of the radial head fracture fragments and the influence of the Mason type on the size of the fracture fragment. Forty-one radial head fractures (31 Mason type I and 10 type II) with an elliptical radial head were included in this retrospective study and 3D reconstructed. First, the fragments were repositioned to their original location. Next, the orientation of the scanned forearm was evaluated using the position of the longest axis relative to the proximal radio-ulnar joint, and all radial heads were rotated to the neutral rotation. The radial head was divided into 4 quadrants (anteromedial, anterolateral, posteromedial, and posterolateral). The location of the fracture line in correlation with these 4 quadrants was evaluated. All fracture fragments were located in the anteromedial quadrant. Thirty-eight (93%) were located in the anterolateral quadrant. The posterolateral quadrant was involved in 32%. At last, the average fracture fragment size was evaluated according to the Mason classification. A significant difference was found in the average fracture fragment size between Mason type I (38% of the radial head surface) and type II (48% of the radial head surface). It was concluded that there is an important involvement of the anterior quadrants of the fracture. The mean size of the fracture is significantly larger in Mason type II compared to type I.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Radial head fractures: a quantitative analysis

Lampaert¹,

Herregodts²,

Wilde³

et al. 2022

Acta Orthop Belg

Self Cite

View full text Add to dashboard Cite

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The role of radial head morphology in proximal radioulnar joint congruency during forearm rotation

Zhang,

Yang,

2024

J. exp. orthop.

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PurposeCongruency of the proximal radioulnar joint (PRUJ) is important in the rotation of the forearm while any compromise would significantly impair the elbow function. The purpose of this study is to determine the morphological features of the radial head and investigate its role in the congruency of the PRUJ during forearm rotation. The hypothesis is that the PRUJ is more congruent in the maximal pronation and supination positions than in the neutral position.MethodsThirty sets of computed tomography images of the elbow were acquired, and a three‐dimensional model of the proximal radius and ulna was generated. The radius of curvature of the radial head and the radial head at the maximal pronation, neutral positions and maximal supination were calculated and compared with a one‐way analysis of variance.ResultsThe point on the radial head contacting the middle point of radial head at the maximal pronation and supination was located at the ends of the semi‐major axis of the ellipse, while it was located at one end of the semi‐minor axis at neutral position. The radii of curvature of the pronation, neutral and supination points of the radial head were 14.72 ± 1.51, 9.74 ± 1.49 and 14.58 ± 1.70 mm, respectively. The value of the neutral point was significantly smaller than that of the pronation and supination points.ConclusionsThis study quantitatively evaluated the morphology of the radial head and suggested that the best congruency of the PRUJ was achieved at maximal pronation and supination, while the neutral position was associated with the least congruency.Level of EvidenceBasic Science Study.

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