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. Reverse Hill Sachs lesions > 25% of the humeral head articular surface in size are often unstable after closed reduction and they also require surgical intervention. Open reduction and surgical stabilization are indicated in such cases with defects 25% to
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determine the critical size of a defect which needs to be treated. This was the very beginning of our serial studies of shoulder stability related to the glenoid and humeral head defects. We created anteroinferior glenoid bony defects of four different sizes
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suggestion that a partial radial head fracture must be of sufficient size (at least 30% of the articular surface) and displacement (at least 2 mm) to be considered a displaced fracture (Mason type II, as opposed to nondisplaced Mason type I) ( 15 ). Despite
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. Internal fixation Since only relatively more simple radial head fractures are considered for internal fixation, screw fixation is most of the time the modality of choice. Most surgeons prefer headless compression screws of various sizes ( Fig. 5 ). In the
Upper Limb Unit, Department of Orthopedic Surgery, Amphia Hospital, Breda, The Netherlands
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Department of Orthopedic Surgery, Amsterdam University Medical Centers, Amsterdam, The Netherlands
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RHAs: over sizing of the head, stiffness because of the (surgically) injured soft tissues around the elbow joint or a loose stem followed by migration of the implant. A clear explanation in the cases of the patients included in this study remains
Department of Orthopedic Surgery, St. Antonius Hospital, Utrecht, The Netherlands
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Department of Orthopedic Surgery, Amsterdam UMC, Amsterdam, The Netherlands
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GS . Determination of correct implant size in radial head arthroplasty to avoid overlengthening . J Bone Joint Surg Am 2009 ; 91 : 1738 – 1746 . 20. Pessis E Sverzut JM Campagna R Guerini H Feydy
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height, humeral head width, Hill–Sachs lesion size, percentage humeral head loss. Maximal humeral head height (A) Residual humeral head width (B) Percentage humeral head bone loss = [(A–B/A)*100] Measurement differences from the 3D CT and 3D MR post
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, and subchondral cysts. The plain radiograph provides a tremendous amount of information as to the aetiology of the degenerative process. For example, superior proximal humeral head migration in relation to the glenoid, as well as acetabularization of
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Anatomy and biomechanics Glenohumeral stability is a multifactorial process whose balance is guaranteed by several structures, of which bone is one. The inherent discrepancy between the size of the humeral head and the scapular glenoid fossa
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Traditionally, the Hill-Sachs defect (HSD) is a posterolateral compression fracture in the humeral head that happens when the glenoid edge hits the humeral head during an anterior dislocation. 5 - 7 The size of the HSD increases with subsequent dislocation
