Image-free navigation technology relies heavily on the surgeon carefully registering bony anatomical landmarks, a critical step in achieving accurate registration which affects the entire procedure. Currently this step may depend on placing a pointer superficially, with soft-tissue and skin obscuring these bony landmarks. We report initial results of using newly developed experimental software which automatically recognises the bone soft-tissue interface. This is the first critical step in development of automatic computer generation of the bone surface topography from ultrasound scanning.

Individual 2D ultrasound images (n=651) of the anterior femoral condyles and trochlear notch were used. Images were taken from 29 volunteers (20 male, 9 female). The software extracted bone-soft tissue interface by a two-step method based on a gradient evaluation and the elimination of false-positives with a graph closure. The trochlear notch was automatically defined by geometrical modelisation. Coordinates of both bone interface and trochlear notch position for each separate image were compared to a separate analysis performed manually by a single investigator. Error was calculated using root mean squared (RMS).

Median error (RMS) in locating bone soft-tissue interface was 0.67 mm, (mean 0.93 mm, SD 0.84 mm). Median error for trochlear notch topography was 1.01mm, (mean 1.41 mm, SD 1.37 mm).

Bone soft-tissue interface can be accurately defined and displayed by this software. Direct visualisation of critical bony landmarks could replace the current comparatively subjective placement of a pointer on superficial tissues. This has powerful application in both non-invasive and surgical computer-assisted acquisition of knee kinematics, and may have further applications in orthopaedic surgery.

Recent emphasis in total knee arthroplasty has been on accelerated rehabilitation and recovery. Minimally invasive and quadriceps sparing techniques have been developed to expediate return to normal function. The aim of this study was to evaluate the effect of the tourniquet on post-operative pain and quadriceps function in total knee arthroplasty.

This study involved a randomised, blinded, prospective trial of 20 patients undergoing total knee arthroplasty by a single surgeon. All patients received a general anaesthetic, identical prosthesis and post-operative protocol. Patients were randomly allocated to one of two group: (a) tourniquet group or (b) no tourniquet group. A standard surgical tourniquet was applied to all patients but only inflated in the tourniquet group.

Outcomes included Oxford knee scores, post-operative pain scores, post-operative drainage and transfusion requirements, thigh and knee circumference measurements, range of motion, and surface EMG measurements at intervals of two weeks, six weeks, six months and twelve months.

The study included 16 male and four female patients with 11 right and nine left knees. There was no significant difference pre-operatively between groups in age, degree of deformity or range of motion.

There was no significant difference detected between Oxford knee scores up to twelve months, days to discharge, post-operative drainage and range of motion. However, the pain scores were significantly higher in the tourniquet group. Surface EMG as a measurement of quadriceps activation showed a significant difference between the groups and between time points. The no tourniquet group can support more energy in their quads muscle than the tourniquet group

The use of a tourniquet in total knee arthroplasty has no effect on overall knee function at twelve months as measured by the Oxford knee score and range of motion; however tourniquet use results in higher initial pain scores and reduction in quadriceps function as measured by surface EMG.

The goal of this study was to evaluate the outcomes from arthroscopic “all inside” meniscal repairs using the FasT-Fix suture system, performed at the Gold Coast and Allamanda Private Hospitals during 2006–2007

40 consecutive meniscal repairs in 36 patients were performed both in isolation and in conjunction with ACL reconstruction. All repairs were performed by the senior author (PG), using an arthroscopic all inside technique with the Fastfix suture anchor system. Patients were assessed at a minimum 6 months follow up, including assessment with the IKDC subjective form.

36 patients underwent a total of 40 meniscal repairs. The average age of the patients was 23.4 years (range 14–42). There were 65% male (26 patients) and 35% female (14 pts). 67.5% (27 menisci) were medial and 32.5% (13 menisci) were lateral repairs. 4 patients underwent bilateral repairs (1 involving 2 different operative dates). 55% (22/40 pts) were right knees and 45% (18/40 pts) were left knees. The average number of FasT-Fix meniscal anchors used was 3.8 (range 1–10). 62.5% (25 pts) underwent concurrent anterior cruciate ligament (ACL) reconstruction. 37.5% (15 pts) were isolated meniscal injuries. 55% (22 pts) had associated chondral surface abnormalities. No Significant complications occurred, including no nerve injuries, infections, or post-operative stiffness. 3 patients underwent subsequent re-operation to resect failed repairs, leaving 37 menisci successfully repaired (92.5%). 5 patients 12.5% described some persistent pain post operation. The average IKDC subjective score for those patients with intact repairs was 91 (62–100).

Meniscal repair using an arthroscopic all inside technique provides a safe, reliable and reproducible method of repairing torn menisci, without the need for a further ‘safety incision’ to retrieve and tie sutures. The outcomes from this study indicate that patients demonstrate similar functional results, and low failure rates, similar to other published meniscal repair methods, including the gold standard of inside-out repair.

A 5 year review into the workload and subsequent financial implications of pelvic and acetabular reconstruction at a regional tertiary referral centre.

To ascertain the level and means of financial recompense for performing pelvic/acetabular reconstruction on patients from other healthcare trusts at a tertiary referral centre.

The records of all 120 patients who underwent either pelvic or acetabular reconstruction between 1995–2000 were examined. Epidemiological data and information on all possible costs of their stay was accumulated (itemised finance department figures were used).

The individual patient billing system of ECRs (Extra Contractual Referrals) was changed in 1998 and replaced by the OATs system (Out of Area Treatments) whereby an annual lump sum was received based on historic referral patterns. We investigated the financial effects that occurred.

60 out of 120 patients treated, were from other health-care trusts. From 1995–1998, 25 ECR patients were treated at an estimated cost of £480, 000. The trust received £280, 000, a net loss of £200, 000. From 1998–2000, 34 OATS patients were treated at an estimated cost of £650, 000, amounting to a net gain of £1. 15 million pounds.

‘Out of area’ referrals for pelvic and acetabular reconstruction have increased by 50 % in the last 2 years. However the new payment system i. e. OATS has resulted in the tertiary referral centre being generously rewarded, unlike prior to 1998 and the old ECR system. It is therefore recommended that annual review must be carried out to ensure that funding will meet the demand for specialist services in the future and prevent subsidisation of some centres by other trusts.

Hip pain in cerebral palsy is regarded to be underreported. Management of these patients at home is difficult as the patients mature. In the ‘non walker’ category, the aims of surgery are to relieve pain and to allow sitting and transfer.

Neuromuscular hips may have variable acetabular deficiencies ie) anterior /posterior / lateral. Many forms of surgical management, of varying complexity, have been described to address these problems.

To describe a new technique with multidirectional coverage that achieves pain free hips, 15 patients were reviewed over a 4 year period.

Inclusion criteria :- 1 Subluxated / dislocated hips with hip pain. 2 Patients who have failed conservative management. 3. Those not suitable for redirectional osteotomies.

A standardised technique was performed by one surgeon, at one institution.

In summary, the technique involves initially a standard derotation varus osteotomy. Via an anterior approach, a lateral iliac unicortical graft and strips of cancellous graft are harvested. The cancellous graft is laid on top of the intact capsule, in the areas of deficiency. The cancellous graft is held by the unicortical graft with a single screw.

15 patients were reviewed. Patients were categorised as ‘walkers’ (3) and ‘non- walkers’ (12.) The mean age was 13.2 years.

All patients were pain free after recovery. This was defined as not requiring analgesia and parental satisfaction.

The radiological appearances showed that all the shelves had incorporated, with satisfactory cover of the femoral head.

This technique addresses multidirectional cover of femoral head. The technique is relatively easy to perform. All the patients have achieved a pain free outcome to date.

The issue of preservation or sacrifice of the posterior cruciate ligament in total knee arthroplasty remains unresolved.

We report the results of 200 consecutive total knee arthroplasties performed at our hospital under the direction of the senior author. Pre-operatively, patients were randomly chosen to receive either a Kinemax (posterior cruciate retaining) or a Press-Fit-Condylar (posterior cruciate sacrificing) prosthesis. We implanted 97 Kinemax and 103 Press-Fit-Condylar prostheses which were prospectively followed-up by clinical and radiographic assessment. Review at mean follow-up of 2.7 years showed a satisfactory clinical result in both groups [Surace, et al., 1994].

We present the results of our further review, with maximum follow-up of over nine years (mean: 5.9 years). Revision of the implant has been performed in five knees (three Kinemax and two Press-Fit-Condylar). The polythene spacer had to be replaced in one patient with a Press-Fit-Condylar implant.

Patients were assessed with the Hospital for Special Surgery Knee Score and radiologically assessed with the Knee Society Roentgenographic Evaluation and Scoring System. Pre-operative demographics and disease states of the patients were similar, with an average Hospital for Special Surgery Knee Score of 63. At the latest assessment the average knee score was good (85). Remarkably, the mean knee score for the posterior cruciate sacrifice and the PCL groups remains similar (mean: 85). Radiographic evaluation demonstrated that the prosthetic components of both groups were in comparable alignment. The posterior cruciate ligament retained (Kinemax) patient group showed a mean 5.9 degrees of the valgus angle at the knee. The angle in the posterior cruciate ligament sacrifice (PFC implant) group was 6.2 degrees. Evaluation of the radiolucent depths below the femoral, tibial and any patella component showed a mean total depth of 1.5 mm (pcl retaining) and 1.7 mm (pcl sacrificing).

Our study presents a quantitative perspective of the results of total knee replacement with proven implant systems and performed in a general orthopaedic unit by both consultants and surgeons in training. The Kinemax (Howmedica) and Press-Fit-Condylar (DePuy Johnson and Johnson) implant systems have both previously demonstrated good results and continue to be available with little subsequent modification.

To our knowledge, there have been no other large prospectively randomised studies of posterior cruciate ligament preservation or sacrifice in total knee replacement.