Total hip arthroplasty using a cylindrical cementless stem in patients with a small physique.

We performed total hip arthroplasty using an anatomic medullary locking cementless stem for small-physique patients from 1988 to 1995. We conducted a retrospective study of 50 joints in 44 cases, including 40 developmentally dysplastic hips followed for 12 to 20 years (average, 15.1 years). Average height and body weight were 152 cm and 56 kg (5.0 ft and 124 lb), respectively, with an average body mass index of 24.2. Twelve joints (24%) were revised for acetabular-sided failures. Forty-eight stems (96%) showed bone ingrowth fixation, and there were no unstable stems. The simple cylindrical shape of the distal portion of the AML stem was less affected by deformity of the proximal femur of developmental dysplasia of the hip in patients with a small physique, and both clinically and radiologically good results were confirmed at long-term follow-up.

In vitro elution of vancomycin from calcium phosphate cement.

Antibiotic-impregnated bone cement beads have become popular for the treatment of osteomyelitis and/or prosthesis infection. However, bone cement has the disadvantage of heating up during polymerization of cement. Recently, calcium phosphate cement (CPC) has been used as a bone replacement and augmentation, and it does not heat up during polymerization. First, we measured the release rate of vancomycin (VCM) from bone cement and CPC impregnated with VCM for 2 weeks in vitro. The mean concentration of VCM for CPC was 62.6 times at 7 days (258 +/- 29 vs 4.12 +/- 1.0) and 6.7 times at 13 days (15.5 +/- 5.5 vs 2.3 +/- 0.7). Second, we were successful in treating 2 cases of osteomyelitis and prosthesis infection with VCM-impregnated CPC. From this study, we concluded that VCM-impregnated CPC might be an effective material for the treatment of osteomyelitis and/or prosthesis infection.

Combined rotational osteotomy and vascularized iliac bone graft for advanced osteonecrosis of the femoral head.

This paper describes the rationale and technique for a combined procedure of transtrochanteric rotational osteotomy and vascularized iliac bone grafting in cases of osteonecrosis of the femoral head with an extensive and widely collapsed necrotic lesion in young patients. The authors performed this combined operation for 12 joints in 12 patients over 14 years from 1984 until 1997. At a mean of 81 months after the operation, in eight patients who had no pain, the average Harris hip score was 90.0 points. Postoperative radiographic evaluation revealed that collapse (more than 2 mm) of the femoral head was prevented in ten patients. Conversion to an endoprosthesis was avoided in all patients except one in this series. The authors recommend this procedure for advanced and extensive osteonecrosis of the femoral head, especially in young patients, to preserve the joint, even though it is a relatively complex procedure.

Correlation between severity of rheumatoid arthritis and manner and extent of cervical lesion.

Abstract To determine the proper management of treatment for rheumatoid cervical lesions, we investigated the clinical course of the cervical spine in rheumatoid arthritis (RA). The severity of RA was classified into three groups according to the disease subsets advocated by Ochi et al.: the less erosive subset (LES), the more erosive subset (MES), and mutilating disease (MUD). Then the following radiographic assessments were performed on cervical roentogenograms: atlantoaxial subluxation (AAS), vertical subluxation (VS), and subaxial subluxation (SAS). One hundred and seventy-four patients were available for this study. The mean age of the patients was 60.9 years (19-85 years). The average duration from the onset of RA was 19.1 years (10-40 years). Eighty-seven patients were classified as LES, 69 were MES, and 18 were MUD. We found that few patients in the LES group had required an operation on the cervical spine. AAS was seen in about 60% of the MES patients, but few cases had VS or SAS, and most operations were atlantoaxial fusion. All patients in the MUD group had some cervical instabilities. Not only VS but also SAS were seen in more than half of these patients, and many patients had required occipitothoracic fusion.