BACKGROUND Significant controversy exists regarding the causes of premature, natural hip-joint failure. Identification of these causes may guide future investigations targeting prevention of this disorder. The aims of this study were to: (1) determine and characterize structural abnormalities associated with premature, natural hip-joint failure, and (2) analyze disease progression in the contra...

Femoroacetabular impingement is uncommonly associated to a rim fracture. Complete resection of the fragment might result in iatrogenic instability or poor femoral head coverage. In this report, we describe the step-by-step surgical technique of arthroscopic partial resection of a rim fracture, reduction and internal fixation of the remaining fragment to correct the impingement, and preserve the...

Here we describe a 28-year-old man with a history of right hip pain for the past 11 years and ankylosing spondylitis for the past 6 months. Imaging studies showed an exostosis in the femoral neck causing femoroacetabular impingement. The patient was diagnosed with coxarthrosis. This case report suggests that femoroacetabular impingement may accelerate the degenerative process in the hip joint.

We have observed the impingement of two cylindrical liquid jets of either the same liquid, water, or two mutually immiscible liquids, water and methylcyclohexane (MCH), in either air under normal pressure (0.101MPa) or nitrogen gas under elevated pressures up to 4.0MPa. The flow rates of the two jets were adjusted such that they had equal axial momentum. Irrespective of the system pressure, we ...

Arthroscopic decompression and cuff debridement was performed on 47 cases in 45 consecutive patients with either stage II or stage III impingement syndrome: 19 with no actual tear of the cuff (stage II); 13 with a partial thickness tear (stage IIIa); 10 with complete tear less than 3 cm long (stage IIIb); and 5 with complete tear longer than 3 cm (stage IIIc). Patients were classified into impi...

UNLABELLED Painful conditions and limited dorsal flexion of the ankle, which are the result of the friction of joint tissues and also the cause and the effect of altered joint biomechanics, are called ankle impingement syndromes. Post-traumatic ankle injures, like an ankle sprains or ankle fractures, are the main causes of impingement lesions, which result in chronic ankle pain. PURPOSE To ev...

numerical study has been carried out for slot air jet impingement cooling of horizontal concentric circular cylinders. the slot air jet is situated at the symmetry line of a horizontal cylinder along the gravity vector and impinges to the bottom of the outer cylinder which is designated as θ=0°. the outer cylinder is partially opened at the top with width of w=30mm and is kept at constant tempe...

Study Design: Case control group study. Objectives: To compare scapular position and orientation between baseball players with and without pathologic internal impingement. Background: Scapular dysfunction has been implicated as a contributor to throwing-related pathologic internal impingement of the shoulder due to its role in increasing the contact between the greater tuberosity and posterior-...

Ankle impingement syndromes are painful conditions that may complicate ankle trauma and are characterized by chronic, progressive pain, swelling, and limitation of movement. These disorders are subclassified according to anatomical location about the tibiotalar joint. This article reviews the various forms of anterior ankle impingement, detailing the unique clinical features, anatomical conside...