Introduction

Wound closure following orthopaedic surgery is an important step requiring careful technique and suitable suture material. The use of subcuticular sutures has been advocated following use in animal models and has also been reported in the literature having been used in specialities such as Orthopaedic Surgery, Plastic Surgery and Obstetrics.

Introduction

The objective of this study was to determine if a synthetic bone substitute would provide results similar to bone from osteoporotic femoral heads during in vitro testing with orthopaedic implants. If the synthetic material could produce results similar to those of the osteoporotic bone, it could reduce or eliminate the need for testing of implants on bone.

We biomechanically investigated whether the standard dynamic hip screw (DHS) or the DHS blade achieves better fixation in bone with regard to resistance to pushout, pullout and torsional stability. The experiments were undertaken in an artificial bone substrate in the form of polyurethane foam blocks with predefined mechanical properties. Pushout tests were also repeated in cadaveric femoral heads. The results showed that the DHS blade outperformed the DHS with regard to the two most important characteristics of implant fixation, namely resistance to pushout and rotational stability.

We concluded that the DHS blade was the superior implant in this study.

We retrospectively reviewed medical records and radiographs of 82 children who presented within 12 months of their birth, with unilateral dislocated/subluxed hips and required treatment in from of traction, closed/open reduction, pelvic osteotomy and maintenance. The purpose of the study was to assess if HE angle could be utilized as a prognostic indicator fro assessing reduction of the affected hip. Hilgenreiner epiphyseal angle was measured by two observers for the normal as well as the abnormal side and differences noted. The measurements of the primary presentation and follow-up films were then correlated. Two groups of patients emerged, those in who the difference between the normal and abnormal hips was less than 10 degrees and those in whom was greater than or equal to 10 degrees, on initial presentation. Their management transpired to be quite different (p=0.000), with open reduction/pelvic osteotomy being required in all cases in the latter group.

Background: We have noticed while performing total hip arthroplasty, that during skin closure, the anterior edge of the wound tends to migrate proximally in relation to the posterior edge. This result is an inaccurate approximation of the wound, the so-called ‘dogs ear’. The aims of the study were to assess and quantify the degree of migration of the anterior edge relative to the posterior one using an invisible marker and to see whether marking the incision site prior to surgery improved skin closure.

Material and methods: We included forty patients undergoing primary hip arthroplasty in the study. Prior to surgery, the skin was marked with five lines perpendicular to the incision line with an invisible skin marker using the greater trochanter as reference point. The skin was then routinely prepared with betadine and a proprietary adhesive incision drape (Ioban 2) was applied to the incision site. The surgeon performed the operation routinely and intra-operatively, the subcutaneous fat content was measured at three set points and averaged. After the wound had been closed, an ultraviolet light source was used to highlight the invisible lines. The gap between the anterior and posterior edge was measured for each line. One set of patients had their incision site marked with a visible marker on the incision drape while the other set did not.

Results: There was a persistent proximal migration of the anterior edge in relation to the posterior edge. The proximal part of the incision site had a more marked skin migration compared to the distal wound. In the unmarked group, the proximal part of the anterior edge tended to migrate on average by 9.5 mm (from 30 mm to 5 mm) in respect to the posterior edge. In the marked group, this migration was reduced to an average of 1.6 mm (from 2 mm to 0 mm) and there was a statistical difference between the 2 groups with p< 0.0001 using the independent t-test as illustrated by the table. Of note, the degree of migration did not vary with the thickness of the fat content. Also, all the wounds healed with no signs of infection.

Conclusion: From this study, we have been able to quantify objectively the extent of migration of the anterior edge of the wound in a hip incision in relation to the posterior edge. Improved hip closure following total hip replacement was achieved after marking the skin prior to surgery. We therefore recommend marking the skin pre-operatively prior to hip incision in order to achieve accurate skin closure as part of the general principle of proper wound closure.