Cotyloplasty in Cementless Total Hip Arthroplasty for an Insufficient Acetabulum

BACKGROUND: Cotyloplasty is a technique that involves making a perforation of the medial wall of a shallow acetabulum and then inserting an acetabular cup with the medial aspect of its dome beyond the Kohler line. The purpose of this study was to evaluate the results of cementless total hip arthroplasty (THA) using cotyloplasty with focusing on the amount of medial cup protrusion. METHODS: Sixteen hips with insufficient acetabulum in sixteen patients were treated by cementless THA using cotyloplasty. The average patient age was 47 years. The diagnoses included dysplastic hip (12) and infection sequelae (4). All the patients were followed up for at least 2 years. Clinically, the Harris hip scores were assessed and radiologically, the amount of cup protrusion, the hip center movement and cup fixation were evaluated. RESULTS: The average Harris hip score improved from 57 to 94 postoperatively. The average proportion of cup surface beyond the Kohler line was 44.1% and the hip centers were medialized by an average of 23 mm. Stable fixation of the acetabular cup was achieved in all the cases except one. In this one case, migration of the cup was detected 2 weeks postoperatively and a reoperation was performed. CONCLUSIONS: Using cotyloplasty, good coverage of the acetabular cup was obtained without a block bone graft, and the hip joint centers were medialized. However, the safety margin for the amount of protrusion should be established.

CT Evidence for Subchondral Trabecular Injury of the Femoral Head in Transient Osteoporosis of the Hip: A Case Report

A 28-yr-old woman presented with both hip pain that started sequentially during the peripartum period. Diagnosis of transient osteoporosis of the hip (TOH) was made based on typical findings of plain radiographs and magnetic resonance images. The subchondral trabeculae of the femoral head were evaluated on serially taken coronal multiplanar reformation computerized tomogram images. At 4 weeks after pain onset, marked decrease in the sclerotic density with irregular discontinuation was observed in the primary compression trabeculae. At 12 weeks, a focal area of irregular thickening of trabeculae was observed. At 20 weeks, sclerotic density of trabeculae recovered markedly and the focal area of irregular trabecular thickening disappeared. At 1 yr, subchondral trabeculae recovered almost completely. The evidence of subchondral trabecular injury was observed in the femoral heads of TOH.

Arterialized Venous Free Flap with Palmaris Longus Tendon for the One-Stage Reconstruction of Defects of Skin and Extensor Tendon / 대한정형외과학회잡지

PURPOSE: The purpose of this study was to introduce our new modified surgical method using a tendocutaneous flap, which is an arterialized venous free flap with palmaris longus tendon, to reconstruct composite defects of the dorsal skin and extensor tendons of the hand and to evaluate the clinical results. MATERIALS AND METHODS: Between March 1994 and December 2001, composite defects of the hands in 39 patients were reconstructed using various modifications of arterialized venous free flap. Among these patients, eight cases of tendocutaneous type were included in this study. The mean age of the patients was 33.2 years (ranging from 19 to 49), and the flap sizes ranged from 1.5x2 cm to 4x7 cm. In 2 of the 8 cases, neurorrhaphy using forearm cutaneous nerve was performed simultaneously for of digital nerve reconstruction. RESULTS: All flaps survived successfully and covered exposed bone and tendon. Marginal necrosis occurred partially in one case by less than 10% and this was completely recovered without any further surgical treatment. A functional range of motion (ROM) at the involved joint was achieved in an average ROM of 70 degrees at the PIP joint and 25 degrees at the DIP joint. CONCLUSION: Tendocutaneous arterialized venous free flap with palmaris longus tendon, is was found to be especially useful surgical foro reconstruct in a composite defects of the dorsal skin and extensor tendon of the hand.