To evaluate prospectively the mid-term results of the Zimmer Unicondylar Knee arthoplasty (UKA).

Between 2005 and 2012, 187 unicompartmental knee arthroplasties (UKA) were performed by a single surgeon using a fixed-bearing prosthesis (Zimmer). 37 cases were excluded as either were lost to follow-up or had less than six months follow-up. The study included 150 UKAs. Deformity, if present, was correctable. Patellofemoral joint (PFJ) disease was not considered as an absolute contraindication. The average patient age at the time of surgery was 66 years (range 42–88 years); 78 of which were male. Mean follow-up time was 3.6 years (range 7–81 months). Mean Body Mass Index (BMI) was 29 (range 21–41). Clinical and conventional radiological evaluations were carried out at six months, one, two and five years postoperatively.

147 cases were medial compartment replacement and three were lateral. 86 patients had grade III OA and 64 had grade IV (Kellgren and Lawrence). 113 patients had an element of PFJ disease. The mean Knee Society knee and function scores had an improvement from 55 and 54 points pre-operatively to 95 and 94 points respectively at time of most recent evaluation. The average flexion improved from 116 degrees pre-operatively to 127 degrees. Two cases were revised, one due to progression of osteoarthritis in the lateral compartment of the knee and the other was due to arthrofibrosis.

The Zimmer unicompartmental knee arthroplasty provided excellent pain relief and restoration of function in carefully selected patients. However, long-term studies are necessary to investigate the survival rate for this prothesis.

Knee warmth is a common clinical observation following total knee arthroplasty (TKA). This can cause concern that infection is present. The purpose of our study was to establish the pattern of knee skin temperature following uncomplicated TKA. It was a prospective study carried out between 2001 and 2004. A pocket digital surface thermometer was used.

A preliminary study established that the best site to measure knee skin temperature was superomedial to the patella and the best time was 12 noon. Patients with an increased risk of infection and those with a contralateral knee pathology or a previous surgery were excluded. Forty-eight patients fulfilled the inclusion criteria and consented to participate; the skin temperature of operated and contralateral knees was measured pre-operatively and daily during the first six weeks post-operatively. Measurements were also taken at 3, 6, 12 and 24 months following surgery. During the course of the study, patients developing complications of the operated knee or any pathology of the contralateral knee were excluded.

Thirty-two patients completed the main study. Following surgery, systemic and both knees temperatures increased. Whereas systemic and contralateral knee temperatures settled within one week, the operated knee temperature took a longer time. The difference in temperature between the two knees had a mean value of +2.9°C at 7 days. This mean value decreased to +1.6°C at 6 weeks, +1.3°C at 3 months, +0.9°C at 6 months +0.3°C at 12 months and +0.04°C at 24 months. Following uncomplicated TKA, the operated knee skin temperature increases compared to the contralateral knee. This increase peaks at day 3 and diminishes slowly over several months; however, it remains statistically significant up to 6 months.

These results correlate with the findings of previous studies that showed a prolonged elevation of inflammatory markers.

Aim: We studied the payments received by our hospital for 109 elective lower limb arthroplasty cases to see if this was fair and consistent under Payment by Results.

Methods: A cohort of patients who had Total Hip Replacement (THR), Total Knee Replacement (TKR), Resurfacing Hip Arthroplasty and Unicompartmental Knee Replacements were taken from the departmental database. Their diagnostic codes, operation details and comorbidities were established and compared with the payment the trust received using the Dr Foster database. This was confirmed with their hospital notes and the finance department.

Results: Twenty THRs and twenty TKRs were paid the standard tariff with one exception. Fifteen Hip Resurfacing arthroplasties showed variable payment from £4690 to £6673 per case. Most interesting were the Unicompartmental Knee Replacements. Despite having almost the same operative and diagnostic codes 46 out of 54 cases were significantly underpaid. During one financial year the trust lost more than £70,000 from this operation alone. This does not meet the Department of Health’s stated aim of being fair and consistent. Out of 109 cases reviewed 51 could have been coded differently and 47 of these were “underpaid”.

Conclusion: In an NHS increasingly driven by financial pressures it is vital that surgeons understand how Payment by Results works. There are significant financial gains to be made by those trusts who pay attention to the small print.

Purpose: The aim of our study was to establish the pattern of knee skin temperature following uncomplicated TKA.

Methods and Materials: It was a prospective study that was carried out between 2001 and 2004. A pocket digital surface thermometer was used. A preliminary study established the site and time of temperature measurement.. Patients with an increased risk of infection and those with a contralateral knee pathology or a previous surgery were excluded. Forty-eight patients fulfilled the inclusion criteria and consented to participate; the skin temperature of operated and contralateral knees was measured preoperatively and daily during the first six weeks postoperatively. Measurements were also taken at 3, 6, 12 and 24 months following surgery. During the course of the study, patients developing complications of the operated knee or any pathology of the contralateral knee were excluded.

Results: Thirty-two patients completed the main study. Following surgery, systemic and both knees temperatures increased. Whereas systemic and contralateral knee temperature settled within one week, the operated knee temperature took a longer time. The difference in temperature between the two knees had a mean value of +2.9^oC at 7 days. This mean value decreased to +1.6^oC at 6 weeks, +1.3^oC at 3 months, +0.9^oC at 6 months +0.3°C at 12 months and +0.04°C at 24 months.

Conclusion: Following uncomplicated TKA, the operated knee skin temperature increases compared to the contra-lateral knee. This increase diminishes slowly over several months; however, it remains statistically significant up to 6 months.

There were 22 patients with cerebral palsy aged six to 17 years who underwent an acetabuloplasty as part of an open reduction of the hip. In 11 patients a paediatric cell saver was used to collect autologous blood which was re-infused per-operatively. This group was compared to a cohort of 11 patients undergoing similar operations in whom only banked homologous blood was transfused.

On average, 432 ml of autologous blood was re-infused compared to 909 ml of homologous blood (p < 0.01), representing 19.6% and 47% of the total blood volume, respectively (p < 0.002). Two units of homologous blood were transfused in the cell saver group compared with 20 units in the control group (p < 0.001). When using a paediatric cell saver, homologous blood transfusion was avoided in 82% of patients and there were no complications.

An intact barrier between the hands of the surgeon and the patient remains the single most important factor in protection against infection for both. Increasing the awareness of possible glove perforation without skin penetration will decrease the risk of contamination.

We performed a prospective, randomised trial comparing the incidence of glove perforation using a new type of glove (Regent Biogel Reveal) and standard double-gloves in total hip and knee replacement. One or more perforations was detected in 14.6% of all gloves. The new gloves increased significantly the awareness of perforation. Multiple perforations at the base of the ring finger were found in surgeons who wore wedding rings during the operation and we recommend that rings be removed before undertaking surgery.