In a prospective randomised controlled trial, 51 patients who did not receive a bone plug during total knee replacement surgery were compared to 49 patients who received a bone plug. The primary outcome measure was the need for allogenic blood transfusion requirement and the secondary outcome was the post-operative blood loss and decline in haemoglobin levels. The patients had autologous re-transfusion from their closed drainage system. The two groups did not differ in the demographics. The mean intra-operative blood loss was slightly more in the no plug group (difference of 41.25 millilitres), which was not statistically significant. There was no statistically significant difference in total post-operative blood loss and drop in haemoglobin levels. Only one patient had two units of allogenic blood transfusion in the no bone plug group while none required allogenic blood in the bone plug group. There was no statistically significant difference in the amount of blood re-transfused from the drain between the two groups. Our findings did not show any statistically significant difference in post-operative blood loss, decline in haemoglobin levels and the need for allogenic blood transfusion in total knee replacement surgery.
Background. Cement restrictors are used for maintaining good filling and pressurization of bone cement during hip and knee arthroplasties. The limitations of certain cement restrictors include the inability to accommodate for large medullary canals particularly in revision procedures. We describe a technique using SurgicelTM (Johnson & Johnson) and SPONGOSTAN™ (Johnson & Johnson) (Fig 1) to form a cement restrictor that can accommodate for large canal diameters and provide excellent pressurisation. Technique. The technique involves the application of SPONGOSTAN™ (Johnson & Johnson) foam onto a SurgicelTM (Johnson & Johnson) mesh which is then rolled onto the SPONGOSTAN™ foam forming a uniform cylindrical structure Figs 2,3. The diameter of the restrictor can be adjusted according to the desired femoral canal diameter through increasing the thickness of the SPONGOSTAN™ (Johnson & Johnson) foam. The restrictor is then inserted into the desired position in the medullary canal where it expands uniformly creating an effective restrictor and bone plug Fig 4. Bone cement is then applied and pressurisation commenced prior to the insertion of the implant Fig5. SPONGOSTAN™ is an absorbable haemostatic sponge intended for haemostatic use by applying to a bleeding surface. It consists of a sterile, water-insoluble, malleable, porcine gelatin absorbable sponge. Surgicel ™ is an absorbable hemostatic agent composed of oxidized regenerated cellulose. It is a sterile, absorbable knitted fabric that is flexible and adheres readily to bleeding surfaces. Both products are routinely used for their haemostatic properties in various surgical disciplines. Discussion. The use of intramedullary plugs in cemented total joint arthroplasty is essential in order to achieve good filling and pressurization in hip and knee arthoplasties, traditionally, a small piece of bone or a cement restrictor may be used to plug the shaft. Distal plugs seal the femoral canal, improve fixation and prevent bone cement from leaking during delivery and pressurization.
