Correction to: Demineralized bone matrix and hydroxyapatite/tri-calcium phosphate mixture for bone healing in rats.

The first name of one author is missing in the published article. The correct abbreviation: H.C. Gemalmaz.

Do porous calcium hydroxyapatite ceramics cause porosis in bone? A bone densitometry and biomechanical study on cortical bones of rabbits.

Porous calcium hydroxyapatite (CHA) ceramics are biocompatible and present osteoconductive properties. These ceramics are widely used in orthopaedic surgery; however, it is not yet known whether they have some adverse effects on bone and bone marrow healing. Our previous radiological study revealed possible local porosis at the adjacent sites of the CHA ceramic. Histological findings of the same study revealed bone marrow swelling and depletion at the implantation site. Osteoclasts removed particles of the implant that may be the cause of local porosis. In the present study, possible local osteoporosis was evaluated by bone densitometry analyses, and compression and three-point bending tests. CHA particles were implanted into the left limbs and a sham operation was utilized on the right limbs of 75 white rabbits. The animals were followed up for 23 weeks for bone mineral density and for 6 months for biomechanical analyses. The CHA implanted area and its distal or proximal adjacent areas were evaluated with a Hologic QDR-2000 bone densitometer. Three-point bending and compression tests were performed with an M-30 K material testing device. The results revealed a time-dependent bone density increase at the CHA implantation site and no significant porosis at adjacent areas of the implant. The stiffness of CHA-implanted bones in three-point bending is larger than that of the control group. CHA-implanted rabbit bones presented a different fracture pattern from the control group. The stiffness of the control and CHA-implanted bones generally increased with time indicating no adverse effects of porous CHA ceramics in bone and bone marrow healing. The clinical relevance of this work is that porous CHA ceramics do not cause local porosis at adjacent areas when implanted into osseous sites.(ABSTRACT TRUNCATED AT 250 WORDS)

The relationship of the heel pad compressibility and plantar pressure distribution.

Loss of heel pad elasticity has been suggested as one of the possible explanations of heel pain. This study aimed to determine the effect of heel pad thickness and its compressibility to heel pressure distribution, in 47 (94 feet) normal subjects and 59 (94 feet) patients with heel pain, using radiological measurements and EMED-SF (Novel, Munich) plantar pressure distribution measurement system. Both heels of the patients and control group were radiographed with and without weight bearing. The ratio of the heel pad thickness in loading to unloading position was defined as "the heel pad compressibility index." The plantar peak pressure of the heel was measured at heel strike phase of the gait cycle. The compressibility index for control and patient groups were found to be 0.60 and 0.69, respectively. The peak pressure under the heel pad was recorded to be 28.4 N/cm2 for patients and 31.7 N/cm2 for control group. No significant difference was found for heel pad compressibility index and heel pad pressures between patient and control groups (p > 0.05). This study revealed that there is no relationship between heel pad compressibility and pressure distribution of the heel pad both in control and patient group. We feel the flexibility of the heel pad does not have any influence on heel pain syndromes.

Multiple hemangiomas of the foot: a case report.

Although hemangiomas are common soft tissue tumors, it rarely involves the feet. We are reporting a forty-seven-year-old female with multiple hemangiomas of her left foot without pain. During surgery there were seven well-defined masses that were totally excised after ligation of penetrating vessels. The microscopic investigation revealed mixed-type (capillary and cavernous) hemangioma. We had not experienced any recurrence after two years follow up period.

Demineralized bone matrix and hydroxyapatite/tri-calcium phosphate mixture for bone healing in rats.

PURPOSE: Hydroxyapatite/tri-calcium phosphate (HA/TCP) mixture is an osteoconductive material used as a bone graft substitute, and demineralised bone matrix (DBM) is an osteoinductive material. A combination of DBM and HA/TCP mixture would probably create a composite with both osteoconductive and osteoinductive properties. The purpose of this study was to determine the effect of the combination of DBM and HA/TCP mixture on healing of rat radius segmental defects. METHODS: Twenty-four adult male Wistar rats were used. Bilateral radial defects were created in each animal. Radial defects were implanted with DBM, HA/TCP mixture and a combination of both substances. Control defects were left unfilled. Ten weeks after implantation, the animals were sacrificed, and the radii were evaluated by radiograhic and histopathological studies. RESULTS: The use of DBM alone demonstrated improved healing on radiographic and histological studies compared to other groups and the control group. There were no differences between the other two groups and the control group. CONCLUSION: The DBM group showed the best healing response. Combined use of DBM and HA/TCP mixture did not improve bone healing, and the osteoinductive properties of DBM were inhibited by HA/TCP mixture.

Footprint and radiographic analysis of the feet.

There is controversy concerning the definition and measurement of the medial longitudinal arch of the foot. Various techniques are reported to assess the medial arch height, including radiographic measurements and footprint analysis, which are the most commonly used methods. Some authors define footprint analysis as unreliable for measuring the arch height. The purpose of this study was to investigate the relationship between radiologically measured angles and the arch index obtained from footprint analyses in 38 children with flexible pes planus. A positive correlation of arch index was found between lateral talo-horizontal and lateral talo-first metatarsal angles (p < 0.05). These angles have been used by some authors to describe the height of the medial longitudinal arch of the foot. This study demonstrated that footprint analysis could be used effectively for screening studies and at individual office examinations.

Pachydermoperiostosis: a case report.

Pachydermoperiostosis in three males of seven siblings from a village of mid-Anatolia is presented. Although X-linkage could not have been ruled out, the autosomal recessive inheritance was considered most likely. It differs from the autosomal dominant form by growth retardation, early ulcers, and acrolysis of the distal parts of the extremities with secondary contractures.