Aims

In recent years, the use of a collared cementless femoral prosthesis has risen in popularity. The design intention of collared components is to transfer some load to the resected femoral calcar and prevent implant subsidence within the cancellous bone of the metaphysis. Conversely, the load transfer for a cemented femoral prosthesis depends on the cement-component and cement-bone interface interaction. The aim of our study was to compare the three most commonly used collared cementless components and the three most commonly used tapered polished cemented components in patients aged ≥ 75 years who have undergone a primary total hip arthroplasty (THA) for osteoarthritis (OA).

Aim: To report our experience and early results with flexible nailing for unstable or irreducible displaced proximal humeral fractures in children.

Material & methods: Between 1997 & 2004, 15 children with unstable or irreducible displaced fractures of the proximal humerus were treated with closed/open reduction and flexible IM nailing. There were 10 boys and 5 girls. The median age of the patients was 12.5 years (9–15). Thirteen children had a Salter – Harris II, Neer grade III/IV fracture and 2 children had metaphyseal fractures. The outcome assessment was performed using the shoulder score, clinical and radiological parameters.

Results: All fractures united. None of the patients had a clinically significant malunion/shortening. Three patients had irritation at the nail insertion site. One patient had a transient radial nerve neurapraxia. There were no other operative or postoperative complications. The flexible nails were removed at a median time of 6 months (1.5–10) in 12 patients and 3 patients are awaiting removal. At a median follow-up of 30 months (4–66) all patients had a normal or near normal glenohumeral motion, full strength and all reported regaining full pre-injury functional use of the involved extremity.

Conclusion: Flexible nailing can be used safely to maintain reduction in unstable or irreducible displaced fractures of the proximal humerus and allows early return to normal activities and function with minimal complications. This treatment is also useful in older children who have minimal remodelling potential.

Background The ossific nucleus of the femoral head is usually present ultrasonographically around 12 weeks of age. It has been considered that the presence of an ossific nucleus in the femoral head is an indication of hip stability. In the ultrasound scan clinic for the assessment of developmental dysplasia of the hip at Sheffield Children’s Hospital, we have identified unstable hips with ossific nuclei, as well as, the appearance of ossific nuclei at as early as 2 weeks of age. These observations suggested the need to clarify the initial considerations that the ossific nucleus appeared ultrasonographically around 12 weeks of age and was an indicator of hip stability.

Aim To determine the relationship, if any, between the presence of the ossific nucleus of the femoral head ultrasonographically and stability of the hip.

Patient selection We have included in our study all the children who have had an ultrasound scan of their hips from 1996 to 1999 at Sheffield Children’s Hospital for suspected developmental dysplasia.

Methodology We have retrospectively reviewed reports of ultrasound scans performed for developmental dysplasia of the hip between 1996 and 1999. We have looked at the report for both the hips of each child. We have collected and analyzed data with regard to the age of the child at the time of the scan, the depth of the acetabulum, the shape of the femoral head, the presence or absence of an ossific nucleus, the dynamic stability of the hips and the congruity of the joint as reported on the ultrasound report. We report the findings in the first 318 hips of the 627 available patients in the study period.

Results The ossific nucleus can appear as early as 2 weeks and yet may not be visible until 24 weeks. In the 318 hips examined the ossific nucleus was present in 46 (14.47%). The age range for these scans was 1–40 weeks after birth. Of the 318 hips 252 (79.24%) were stable on dynamic screening, 274 (86.16%) had a normal(spherical) appearance of the femoral head, 209 (65.72%) had normal acetabular development and 263 (82.7%) demonstrated congruence of the hip joint. These data have been analyzed using Microsoft excel at confidence intervals of 0.8, which suggest no relationship between the presence of the ossific nucleus and hip stability.

Conclusion The limited early results of this study have shown that the ossific nucleus of the femoral head can appear from a very early age, may not appear until well after 12 weeks of age and is not an indicator of hip stability. Its presence on ultrasound scan does not exclude developmental dysplasia of the hip.