Total Knee Arthroplasty (TKA) patients may present with effusion, pain, stiffness and functional impairment. A positive metal hypersensitivity (positive LTT) may be an indication for a revision surgery with a custom-made implant devoid of any hypersensitivity-related metal or an implant with the least possible ion content of the metal hypersensitivity, if no custom-made is available. The purpose of the current study is to assess the prevalence of metal hypersensitivity in subjects requiring a primary TKA and assess their early functional outcomes.

We are recruiting 660 subjects admitted for TKA. Subjects are randomly assigned to 2 groups: oxidized zirconium implant group or cobalt-chrome implant group. Functional outcomes and quality of life (QoL) are measured pre operatively, 3, 6 and 12 months post operatively with WHOQOL-BREF (domain1-Physical Health, domain 2- Psychological, domain 3- Social relationships, domain 4-Environment), KSS, KOOS and pain Visual Analog Scale (VAS). LTT and metal ions are evaluated pre operatively and 12 months post-surgery.

One hundred-sixty patients, 98 women, were enrolled in the study. Mean age was 65.6±8.9. Mean follow up (FU) was 7.1±3.8 months. Eighty-one (50.6%) were randomised in the cobalt-chrome group. Infection rate was 1.9%, one patient required debridement. Three patients (1.9%) presented with contracture at three months FU. At 12 months, WHOQOL-BREF domain 1, 2 and 4 improved significantly (p0,05).

Overall, all 160 patients improved their functional outcomes and QoL. At 12 months, VAS scores decreased from 7±2.06 at baseline to 1.95±2.79. Furthermore, the high prevalence of positive LTT (27/65) do not seem to affect early functional outcomes and QoL on patients that may have received a potential implant with hypersensitivity (18/27).

Treatment of proximal humerus fractures (PHF) is controversial in many respects, including the choice of surgical approach for fixation when using a locking plate. The classic deltopectoral (DP) approach is believed to increase the risk of avascular necrosis while making access to the greater tuberosity more difficult. The deltoid split (DS) approach was developed to respect minimally invasive surgery principles. The purpose of the present study (NCT-00612391) was to compare outcomes of PHF treated by DP and DS approaches in terms of function (Q-DASH, Constant score), quality of life (SF12), and complications in a prospective randomized multicenter study.

From 2007 to 2016, all patients meeting the inclusion/exclusion criteria in two University Trauma Centers were invited to participate in the study. Inclusion criteria were: PHF Neer II/III, isolated injury, skeletal maturity, speaking French or English, available for follow-up (FU), and ability to fill questionnaires. Exclusion criteria: Pre-existing pathology to the limb, patient-refusing or too ill to undergo surgery, patient needing another type of treatment (nail, arthroplasty), axillary nerve impairment, open fracture. After consent, patients were randomized to one of the two treatments using the dark envelope method. Pre-injury status was documented by questionnaires (SF12, Q-DASH, Constant score). Range of motion was assessed. Patients were followed at two weeks, six weeks, 3-6-12-18-24 months. Power calculation was done with primary outcome: Q-DASH.

A total of 92 patients were randomised in the study and 83 patients were followed for a minimum of 12 months. The mean age was 62 y.o. (+- 14 y.) and 77% were females. There was an equivalent number of Neer II and III, 53% and 47% respectively. Mean FU was of 26 months. Forty-four patients were randomized to the DS and 39 to the DP approach. Groups were equivalent in terms of age, gender, BMI, severity of fracture and pre-injury scores. All clinical outcome measures were in favor of the deltopectoral approach. Primary outcome measure, Q-DASH, was better statistically and clinically in the DP group (12 vs 26, p=0,003). Patients with DP had less pain and better quality of life scores than with DS (VAS 1/10 vs 2/10 p=0,019 and SF12M 56 vs 51, p=0,049, respectively). Constant-Murley score was higher in the DP group (73 vs 60, p=0,014). However, active external rotation was better with the DS approach (45° vs 35°). There were more complications in DS patients, with four screw cut-outs vs zero, four avascular necrosis vs one, and five reoperations vs two. Calcar screws were used for a majority of DP fixations (57%) vs a minority of DS (27%) (p=0,012).

The primary hypothesis on the superiority of the deltoid split incision was rebutted. Functional outcome, quality of life, pain, and risk of complication favoured the classic deltopectoral approach. Active external rotation was the only outcome better with DS. We believe that the difficulty of adding calcar screws and intramuscular dissection in the DS approach were partly responsible for this difference. The DP approach should be used during Neer II and III PHF fixation.

Purpose: The literature contains little information on an objective method of measuring radiocapitellar joint translations, as would be seen with joint instability. The purpose of this study was to develop and validate a measurement method that was simple and that could be easily reproducible in a clinical setting or intra-operatively to assess radiocapitellar joint translations.

Method: We performed a radiological study on a synthetic elbow specimen in order to quantify radial head translations as related to the capitellum: the Radio-capitellum ratio (RCR). Thirty (30) lateral elbow x-rays were taken in different magnitude of subluxation of the radial head. The subluxation was created randomly by manipulation. X-rays where taken by fluoroscopy to obtain a perfect lateral view of the distal humerus. First, the evaluators determined the long axis of the radius and the center of the capitellum. The displacement of the radial head (in mm) was obtained by measuring the distance of the line perpendicular to the long axis of the radius passing through the center of the capitellum. Then, in order to adjust for variation of magnification, a ratio of the displacement of the radial head about the diameter of the capitellum was done. The RC ratio would be of zero because the long axis of the radius always crosses the center of the capitellum in a perfectly aligned joint. A five mm translation of the radial head and a capitellum diameter of twenty (20) mm would give a RCR of 25% and would be positive if anterior and negative if posterior. The measurements were done two times at one week intervals by three independent evaluators to test inter-observer agreement and intra-observer consistency. The radiological incidences were randomly ordered to minimize observer recall bias. Intra/inter-observer reliability was calculated using Intra-Class Correlation (ICC) and paired T-tests.

Results: The mean translation in the trial group was of 6,06% (SD 70.7%) from – 167% to 125%. A result over 100% means that it is a complete dislocation ie – the axis of the radius is outside of the capitellum. Negative values signify posterior translation and positive values an anterior translation. Intra-observer reliability was excellent for the Radio-capitellum ratio (ICC 0.988 and 0.995) and inter-observer reliability was excellent (ICC 0.984 in average). Paired T-test results confirm a high intra-observer repeatability (p=0.97 and p=0.99) as well as a large inter-observer reproducibility (p=0.98 in average).

Conclusion: The proposed measurement of radial head translation about the capitellum (in percent): radio-capitellum ratio (RCR) has excellent inter – and intra-observer reliability when using our measurement method.

Purpose: The age of patients presenting with acetabular fracture has increased over the last ten years. Older patients tend to have patterns involving the anterior column with comminution of the quadrilateral plate. Our goal was to investigate the appropriateness of open reduction and internal fixation using the modified Stoppa approach for geriatric acetabular fractures.

Method: A retrospective review of patients over the age of 60 having presented to an academic level I trauma center over the course of four years. Twenty patients were identified and treated using the modified Stoppa approach with plating of the quadrilateral surface. Patients were evaluated clinically using both SF-36 and Harris Hip Score. Records and radiographs (using criteria described by Matta) were reviewed retrospectively.

Results: All patients were followed for a minimum of two years with no lost at follow-up. Mean age for patients at time of intervention was 68 years. Average blood lost was 800cc and surgical time was 130 minutes (range, 55–210). There was one traumatic injury to the obturator nerve and two patients were noted to have temporary weakness of the hip adductors postoperatively. Average Harris Hip Score and the SF-36 were improved significantly (p< 0.05). Significant lost of reduction was seen in two patients and was correlated to superior dome impaction (p < 0.0001). Three patients required re-intervention with a Total Hip Arthroplasty.

Conclusion: Internal fixation using the modified Stoppa approach to buttress the quadrilateral plate should be considered a viable alternative to total hip arthroplasty for the initial treatment of acetabular fractures of the anterior column in the elderly.

Purpose: Lors de la réduction chirurgicale des fractures de la cheville avec instabilité syndesmotique, le chirurgien se fie généralement sur les vues de mortaise et antéro-postérieure. Toutefois, une subluxation ou luxation antérieure du péroné par rapport au tibia distal peu survenir et passer inaperçu (trois exemples cliniques prouvés par CT Scan post-opératoire), spécialement lors de la pose de vis syndesmotique(s). La présente étude a pour but d’établir la relation radiologique précise sur une vue latérale fluoroscopique entre les tibia et péroné distaux qui permettra au chirurgien de confirmer en peropératoire que l’articulation tibio-péronière distale est bel et bien réduite.

Method: Les chevilles normales de trente volontaires sans antécédent de traumatisme ou de maladie de la cheville ont été imagées sous une vue latérale fluoroscopique parfaite, avec un Mini C-Arm. Les images ont été analysées et comparées entre elle afin d’établir une relation radiologique fiable et reproductible entre le tibia et le péroné distaux.

Results: Dans les trente cas, il y avait intersection du milieu de la cicatrice physaire et du cortex antérieur du péroné. Cette relation a été trouvée statistiquement significative.

Conclusion: La réduction chirurgicale parfaite de l’articulation tibio-péronière distale peut être confirmée avec une vue latérale fluoroscopique de la cheville. Le cortex antérieur du péroné doit toucher le milieu de la cicatrice physaire.

Purpose: The short-term results of metal-on-metal hip resurfacing (HR) have been excellent. However, extensile approaches such as the posterior and trochanteric slide have been used to ensure proper component placement. The minimally invasive (MI) anterior Hueter approach is both muscle and vascular sparing to the femoral head. The purpose of this study is to evaluate the learning curve of this approach in performing hip resurfacing.

Method: The first 50 MI HR done by a single high volume arthroplasty surgeon were compared with his previous fifty procedures performed through a trochanteric slide osteotomy, with respect to (BMI, sex, etiology and age) were comparable (p=.372,.122,.143 and .353, respectively).

Results: Overall, the traditional transtrochanteric lateral approach took significantly longer to perform compared to MI RAH (97 versus 109 minutes, p=0.014). If we exclude the first 25 MI RAH cases (mean, 106 minutes), the difference is greater (89 versus 109 minutes, p=0.002). The mean femoral component stem to femoral shaft angle (SSA) was not significantly different between the two groups (MI RAH=142.7, lateral approach=140.0, p=0.053). The cup abduction angle (CA) was slightly different between the two groups (MI RAH 42.5°, lateral approach=39.2°, p=0.03). More patients had cup abduction angles in the 45°–55° range (p=0.009) in the MI HR group but none had a cup angle over 55° of abduction in either group. On the femur side, component positioning was comparable.

Conclusion: Based on our early results, the anterior-Hueter approach is a reasonable alternative to more extensile surgical approaches. Like any MI approach to hip surgery, great care has to be taken not to put the cups too vertical. Further long-term studies as well as comparisons to other approaches such as the posterior approach will determine if the anterior approach can be recommended for hip resurfacing.

Plate fixation of the proximal humerus fractures may now be more desirable with the use of a biological approach by limiting surgical insult and allowing accelerated rehabilitation by a solid fixation. To evaluate the safety and efficacy of minimally invasive plating of the proximal humerus using validated disease-specific measures.

During a period of one year, thirty patients were operated with use of the LCP proximal humerus plate (Synthes) through a 3cm lateral deltoid splitting approach and a second 2 cm incision at the deltoid insertion. The axillary nerve was palped and easily protected during insertion. Only two-part (N=22) and three-part impacted valgus type (N=8) were included in this study since they can be reduced indirectly thru this percutaneous technique. The average follow-up was thirteen months (eight to twenty months). All patients had the Constant and DASH evaluations.

All fractures healed within the first six months with no loss of correction. The surgical technique was found easy by all surgeons, the axillary nerve was palpated and protect with this new technique. No infection or avascular necrosis were seen. No axillary nerve deficit was identified. At the last follow-up (average nineteen months, twelve months minimum), the median Constant score was sixty-eight points, with an age ajusted score of seventy-six. The mean DASH score was twenty-seven points. Only age was independently predictive of both the Constant and DASH functional scores. Patients improved until one year of follow up.

Percutaneous insertion of a locking proximal humerus plate is safe and produces gives good early functional and radiologic outcomes. Recuperation from a proximal humerus fracture can be seen until one year.

Purpose: Restoration and maintenance of the plateau surface are the key points in the treatment of tibial plateau fractures. Any deformity of the articular surface jeopardizes the future of the knee by causing osteoarthritis and axis deviation. The purpose of this study is to evaluate the effect of trabecular metal (porous tantalum metal) on stability and strength of fracture repair in the central depression tibial plateau fracture.

Method: Six matched pairs of fresh frozen human cadaveric tibias were fractured and randomly assigned to be treated with either the standard of treatment (impacted cancellous bone graft stabilized by two 4.5mm screws under the comminuted articular surface) or the experimental method (the same screws supporting a 2 cm diameter Trabecular Metal (TM) disc placed under the comminuted articular surface). Each tibia was tested on a MTS machine simulating immediate postoperative load transmission with 500 Newton for 10000 cycles and then loaded to failure to determine the ultimate strength of the construct. Results: The trabecular metal construct showed 40% less caudad displacement of the articular surface (1, 32 ±0.1 mm vs. 0, 80 ±0.1 mm) in cyclic loading (p< 0.05). Its mechanical failure occurred at a mean of 3275 N compared to 2650 N for the standard of care construct (p< 0, 05).

Conclusion: The current study shows the biomechanical superiority of the trabecular metal construct compared to the current standard of treatment with regards to both its resistance to caudad displacement of the articular surface in cyclic loading and its strength at load to failure.

The most commonly used surgical techniques used to treat recurrent or habitual patellar dislocation in the child do not specifically address the patella alta, one of the major causes of patellar dislocation. Twelve knees in eight patients had a lowering of the patella by total tendon transfer, lateral release and vastus medialis obliquus advancement. At two years of follow-up, only one knee had redislocated. Radiographically, the patellar height was anatomically restored in all other knees. All patients were pain free. This surgical technique is a good treatment option in the immature patient with recurrent or habitual patellar dislocation.

Patella alta is one of the major causes known to predispose children to recurrent or habitual patellar dislocation. However, the surgical treatment of such a condition, before squeletal maturity, is rarely if ever mentioned in the literature.

Twelve knees in eight patients were treated with a surgical procedure designated to correct patella alta, the major predisposing factor causing recurrent patellar dislocation. The technique involves lowering of the patella by total tendon transfer, lateral release and vastus medialis obliquus advancement. All patients were complaining of recurrent or habitual dislocations leading to functional disability. Patellar height was assessed radiographically by the Koshimoto index (PT/FT) and Caton-Deschamps index (AT/AP). The average at surgery was 10.9 years and mean follow-up was 45.1 months.

Follow-up revealed redislocation in one knee. This patient required a second operation to achieve patellar stability. At the latest follow-up, all operated knees were functionally stable and pain free. The average preoperative ratios were 1.28 (PT/FT) and 1.53 (AT/AP) which improved to 0.97 (PT/FT) and 0.96 (AT/AP) at the time of follow-up. Few complications were noted.

This technique is a valid surgical alternative to treat the immature patient presenting with functional disability related to recurrent or habitual patellar dislocation associated with patella alta.

We compared internal fixation augmented with a trabecular metal implant to internal fixation augmented with morcellized bone grafting for depressed lateral tibial plateau fractures. Six cadaveric tibia pairs were prepared and tested on a MTS machine for both cyclic loading and static load to failure. Results showed greater resistance in cyclic loading and load to failure in the trabecular metal group. We found half the loss of reduction of the tibial articular surface compared after cyclic loading over 10 000 cycles. These surprising results show the biomechanical superiority of our trabecular metal construct over the current standard of care.

Restoration and maintenance of the plateau surface are the key points in the treatment of tibial plateau fractures. Any deformity of the articular surface jeopardises the future of the knee by causing osteoarthritis and axis deviation. The purpose of this study is to develop a more solid way to fix the Shatzker III fracture and to test a trabecular metal implant in the trauma setting for the first time.

Six matched pairs of fresh frozen human cadaveric tibias were fractured and randomly assigned to be treated with either the standard of care (two 4,5mm cortical raft screws augmented with morcellized bone graft) or the new method (the same screws supporting a 2 cm diameter trabecular metal disc placed under the comminuted articular surface). The specimens were tested in cyclic loading and put at load to failure.

The trabecular metal construct showed 40% less caudad displacement of the articular surface (1,43 mm vs 0,81 mm) in cyclic loading (p< 0.05). Its mechanical failure occurred at a mean of 3275 N compared to 2650 N for the standard of care construct (p< 0,05).

The current study shows the biomechanical superiority of our trabecular metal construct compared to the current standard of treatment with regards to both its resistance to caudad displacement of the articular surface in cyclic loading and its strength at load to failure. Trabecular metal is a good metaphyseal void filler in the studied fracture.