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PubMed1976

["Zuggurtungs"-hip joint endoprosthesis (author's transl)].

On the basis of theoretical and experimental investigations to the problem of endoprosthetic replacement of the hip joint and the forces concerning the anchorage of the prosthesis a new model of prosthesis was developed and realized for practical use. In this paper this new "Zuggurtungs-Hüftendoprothese" and the biomechanical principles are described in detail. The biomechanically derived postulations realized in the new prosthesis which are of primary importance to avoid the mechanical complications of loosening and breaking of the prosthesis are also decisive when optimal materials are used. They allow the implantation without bone cement by the primary acievable stable anchorage.

Biomechanical Phenomena↗
PubMed1994

Annual evaluation of hip joints and hands for radiographic signs of A beta 2M-amyloidosis in long-term hemodialysis patients.

Radiographs of hand and hip joints of 15 hemodialysis patients taken annually over at least 15 years were evaluated in this retrospective study. We looked for signs of A beta 2M-amyloidosis such as lucencies, erosions, and soft tissue swelling. The femoral head-soft tissue distance (FHSTD) was used to estimate the soft tissue swelling of the hips. The number and size of lucencies, the number of erosions, and the FHSTD increased during dialysis. Both hyperparathyroidism and failure of renal allograft transplantation influenced the development of lucencies and erosions after 15 years. The FHSTD at the start of the dialysis appeared to be an independent prognostic factor for the lucencies of the hips and hands. We conclude that the radiological signs of A beta 2M-amyloidosis are influenced not only by the duration of dialysis, but also by age, failure of renal transplantation, hyperparathyroidism and the FHSTD at the start of dialysis.

Adult↗
PubMed1984

Effect of the high femoral osteotomy upon the vascularity and blood supply of the hip joint.

This investigation was done to study the effects of high femoral osteotomy upon the vascularity and blood supply of the hip and to further our knowledge of its physiologic basis. We have used established methods of study, including bone scans, microangiography, isotope clearance and perosseous venography, and based upon the results of these studies, we have reached certain conclusions. First, high femoral osteotomy increases the blood flow and vascularity in the hip joint, the femoral head and neck and the great trochanter. Second, bone scanning techniques using 99mTc labeled diphosphonate have shown increased uptake in the femoral head and neck after high femoral osteotomy. The localization was done using a Digital Gamma III computer, and the activity on the osteotomy side at two weeks was 3.5 times as great as on the control side. By 16 weeks postoperatively, there was still two times as much activity on the osteotomy side. Third, microangiography showed increased vascularity both at the osteotomy site and in the femoral head and neck and the greater trochanter on that side. Such an increase in vascularity first became evident two weeks after osteotomy and persisted during the four month period studied. Fourth, the results of the 99mTc diphosphonate clearance study showed a 25 per cent increase in femoral head blood flow on the operative side. Fifth, perosseous venography of the femoral head and neck showed a marked increase in venous drainage through the osteotomy site in the immediate postosteotomy stage.

Animals↗
PubMed2003

An approach for hip joint center calculation for use in seated postures.

In seated postures, such as those in office or automotive seats, locating the hip joint center (HJC) using three markers on the pelvis has been difficult if not impossible. A two-target approach by Bell et al. (J. Biomech. 23 (1990) 617) has been used, however, this method was shown to have inaccuracies when compared to the three-target method developed by Seidel et al. (J. Biomech. 28 (1995) 995). A new two-target method that is specific to the seated environment, has better accuracy than the Bell et al. approach, and is based on the Seidel et al. approach was developed and tested on 13 seated subjects. This new method used three targets and an initial reference file to estimate the HJC location. Once the HJC was located, assumptions were made that the magnitudes between the HJC and the respective anterior superior iliac spine, and the HJC and the respective lateral epicondyle remained constant. The primary concern when evaluating this new method was the affect of seated posture movement, in particular leg splay and spinal flexion on the assumptions. The results obtained with the new approach were compared to Seidel et al. and provided HJC locations with average differences of 3.8, 1.2 and 2.8mm for spinal flexion in the anterior/posterior, medial/lateral and superior/inferior directions, respectively, and 2.3, 1.0 and 1.4mm for knee splay. The proposed method provided better HJC estimation than the Bell et al. approach particularly in the superior/inferior dimensions.

Adult↗
PubMed1996

Unrecognized foreign body in the hip joint.

A 40-year-old woman involved in a motor vehicle accident sustained a left acetabular fracture and a dislocated left hip with a large ipsilateral traumatic hip wound. Multiple plain radiographic films of the pelvis and a pelvic computed tomographic scan were obtained. None of these images showed a 25 x 20 x 12-mm piece of the gearshift that was found in the hip joint at the time of the surgery. Hence, we present this case highlighting an unusual phenomenon in which a large foreign body was not recognized on preoperative radiographic studies.

Acetabulum↗
PubMed1990

[Imaging of the hip joint hyaline cartilage with MR tomography using a gradient echo sequence with fat-water phase coherence].

We have been able to display the hyaline hip joint cartilage clearly and with high signal strength in the magnetic resonance image with a gradient echo sequence with 2 different fresh hip specimens from corpses and with 10 healthy test subjects (5 m, 5 f). The chemical shift artifact at the bone-cartilage boundary could be clearly reduced by optimizing the geometrical scanning parameters. A comparison between the cartilage thickness at the head of the femur measured on the anatomical specimen with the thickness measured in the magnetic resonance tomogram showed a good correlation on suitable selection of the read-out gradient. The hyaline cartilage at the head of the femur could be differentiated from the acetabular cartilage in the region of the loading zone by magnetic resonance tomography in all 10 test subjects.

Cartilage, Articular↗
PubMed1976

Traumatic anterior dislocation of hip joint with vascular damage.

Closed reduction of an anterior dislocation of the hip joint in a 15-year-old boy failed because of interposition of capsule, iliopsoas and rectus femoris muscles. The immediate complications were compression of the common femoral artery, tear of the femoral vein, and fat embolism 24 hours after the injury. The sequelae were periarticular ossification and avascular necrosis of the femoral head. The definitive treatment was a Charnley total hip arthroplasty.

Adolescent↗
PubMed2002

[A case of a ganglion cyst originating from the hip joint and surgical outcome].

Ganglion cysts are the most common soft tissue tumors of the hand, wrist, and foot. However, those originating from the hip joint are not so frequent. This case report presents a 36-year-old woman who complained of pain in the right groin. A diagnosis of atypical ganglion cyst of the hip was made and the lesion was surgically removed. The diagnosis was confirmed histopathologically. No complaints were observed after a follow-up period of 18 months.

Adult↗