Femoral offset loss and internal arch restoration defect are correlated with intramedullary nail cut-out complications after pertrochanteric fractures: a case-control study.

BACKGROUND AND PURPOSE: In a previous study, we investigated the link between the femoral offset (FO) loss by trochanteric impaction (TI) and cut-out complication occurrence after pertrochanteric fractures. Three major factors are likely to drive to failure after intramedullary nailing (IN): fracture stability, reduction quality and osteosynthesis quality. We wanted to investigate the quality of the fracture reduction through the TI and the neck-shaft angle (NSA) measurement and correlate these parameters with the risk of mechanical failure occurrence. MATERIALS AND METHODS: It was a retrospective multicentric one case-one control match design study with age and gender randomization. The cases presented a mechanical failure of nailing: [Formula: see text] in percentage. Femoral rotation was taken into account, and all TI were rotation-corrected (TIcorrected). Rotation-corrected neck-shaft angles (NSAcorrected) were calculated. The neck-shaft angle gap between the fractured and the healthy sides (NSAgap) was a ratio: [Formula: see text] in percentage. The tip-apex distance (TAD) was measured. Absolute values of TIcorrected and NSAgap were analyzed. RESULTS: Twenty-one cases and 21 controls were examined. The average TIcorrected rate was 30% for the cases and 11% for the controls (p = 0.007). A 13% TIcorrected threshold had maximum specificity and sensitivity, equal to 71%. The average TAD was 27 mm for cases and 19 mm for controls (p = 0.004). The average NSAgap rate was 7% for the case group and 4% for the control group (p = 0.009). The areas under the ROC curves for TIcorrected, TAD and NSAgap were 0.73, 0.73 and 0.66, respectively. INTERPRETATION: Closed reduction and exclusive implantation of IN do not seem optimal in case of FO or NSA restoration failure after pertrochanteric fractures. LEVEL OF EVIDENCE: Level III, case-control study.

Measuring extension of the lumbar-pelvic-femoral complex with the EOS® system.

INTRODUCTION: Sagittal balance of the coxofemoral joint in standing position and its extension capacity determine hip/spine adaptation, especially in relation to pelvic retroversion, which may be age-associated or follow either spinal arthrodesis or vertebral osteotomies. The concept of extension reserve is essential for assessing posterior hip impingement. The global visualization of the lumbar-pelvic-femoral complex obtained by EOS(®) imaging enables this sagittal analysis of both the subpelvic region and lumbar spine by combining the reference standing position and the possibility of dynamic tests. MATERIALS AND METHODS: We studied 46 patients and their 92 hips. The EOS(®) radiography was performed in neutral standing position and with one foot on a step, alternately the right and left feet. Pelvic incidence, sacral slope, pelvic version, and femoral version were measured twice by two operators. The global extension reserve (GER) was defined by the sum of the intrinsic extension reserve (allowed by the hips, IER) and the extrinsic extension reserve (allowed by the spine, EER). The IER for each hip corresponds to the difference in the sacrofemoral angle (SFA) for each of the two positions. The EER was measured by the difference in the sacral slope. A descriptive study was performed, together with studies of inter- and intra-observer reproducibility, right/left symmetry, and an analysis according to age, sex, and BMI. RESULTS: The mean femoral version in the reference position was 11.7° (SD 14.3°). The reproducibility of the SFA measurement was statistically verified. The IER (mean 8.8°), EER (mean -0.7°), and GER (mean 8.2°) all differed significantly between the two sides for each patient and were not associated with age, sex, or BMI. DISCUSSION: The femoral axis is not perpendicular to the ground in neutral position, contrary to the conventional view of this position. The measurements proposed for dynamic sagittal analysis of the hip are reproducible and make it possible to identify the IER within the GER of the spinal-pelvic-femoral complex. CONCLUSION: The assessment of the lumbar-pelvic-femoral complex by EOS imaging makes it possible to define the intrinsic and extrinsic extension reserves to describe the reciprocal adaptive capacities of the hips and spine. LEVEL OF EVIDENCE: IV.

Trauma of the upper cervical spine: focus on vertical atlantoaxial dislocation.

PURPOSE: Traumatic ligament injuries of the craniovertebral junction, either isolated or associated with bone avulsion or fracture, often lead to death. These injuries are rare and underrated but are increasingly seen in emergency departments due to the improvement in initial on-scene management of accidents. Vertical atlantoaxial dislocation (AAD) is a specific lesion that was barely reported. Based on our experience, our goal was to systematically investigate the prevalence and prognosis of traumatic vertical AAD and discuss its management. METHODS: All cervical CT scans performed at our institution between 2006 and 2010 for cervical trauma in adults were retrospectively reviewed. Based on the measurement of lateral mass index (LMI), defined as the gap between C1 and C2 articular facets, we identified three cases of traumatic vertical AAD in 300 CT scans. Their medical records were investigated. RESULTS: The incidence of vertical AAD was 1% in the exposed population. One case was an isolated vertical AAD and two were associated with a type II odontoid fracture. We report the first case in the literature of unilateral vertical AAD. Two patients died rapidly; the survivor was treated with occipitocervical fixation. Specific maneuvers were used for immobilization and reduction. CONCLUSIONS: This study found a not insignificant incidence of vertical AAD and a high lethality rate. LMI appears to be a relevant radiological criterion for this diagnosis, for which traction is contraindicated. Associated neurological or vascular damage should be suspected and investigated. In our experience, spinal surgical fixation is required because of major instability.

Tiny but risky: The reasons why the Caspar pin distractor causes suffocating cervical hematoma-Two cases and a literature review.

Symptomatic cervical hematoma (CH) after cervical spine surgery through an anterolateral approach is a feared complication. In up to 60% of CH cases, no source of bleeding is detected during drainage. Bleeding from the pin holes of the Caspar distractor is a known complication, briefly mentioned in the patent, but harmfulness has never been thoroughly assessed. Our team experienced two consecutive postoperative acute CHs, in which the origin of active bleeding obviously came from pin holes, despite careful obturation. The aim of this study was to report these two cases and provide a comprehensive assessment of the dangers of Caspar pin distractors. The intrabody vascularization was well organized and there was a central pedicle arising from the center of the posterior wall. The pedicle penetrated deeply into the body and constituted Batson's channel posteriorly. Retrospectively, it was well-identified in both cases on preoperative imaging. Given the morphological features of the vertebral cervical bodies and Caspar pin, the pin may reach the center of the posterior wall where the pedicle arises. Comparison between vertebral body volumes and the volume of the screwable part of the pins revealed that the pin could occupy up to 7.3% of the total body if randomly inserted. However, pins are in fact inserted into a particular place that contains the pedicle. Epidural bleeding is variable and may be undetected before closure. This also depends on blood pressure variations and changes in the patient's position. Even though Caspar pins are tiny, the likelihood of intrabody vascularization damage appears to be significant. Caspar pins should not be used systematically. Pin hole obturation must be solid and deep. Alternative options such as an interbody distractor and a microscope for the discectomy should be considered.

[Multicentric giant-cell tumor]. / Tumeur à cellules géantes multifocale.

Nearly all (99) giant-cell tumors are solitary. The multicentric presentation is exceptional and not well elucidated. We report the case of a patient presenting five foci identified over an eleven-year period (right tibia, left 4th metacarpal, sacrum, right femur, left femur). The proliferation index was identified for each focus. A review of the literature shows that the development of a new center after treatment for giant-cell tumor is a well-known event, with a wide variability in localizations, number and time to development. The most recent data suggest that each center would be independent progressing according to an individual course. Since histological transformation is not observed and multicenter forms are very exceptional, we suggest that it would not be necessary to propose specific screening for patients with a giant-cell tumor but that it would be good to inform the patient of the possibility of multicentric presentations.

Degenerative disease supra- and infra-jacent to fused lumbar and lumbo-sacral levels.

Disc degeneration is a normal age-related process. Accelerated degeneration of discs adjacent to fused spinal levels has been observed in numerous case-series studies. The available data document this phenomenon and provide information on its time to occurrence but show huge variations in incidence rates (5% to 70%). The supra-jacent disc is involved more often than the infra-jacent disc. Studies have clarified the underlying biomechanical rationale by showing increased loading of the adjacent discs. Risk factors have been the focus of the most recent studies. They include the number of fused levels, sagittal alignment, level of fusion, stiffness of the construct, and integrity of the posterior structures. Nevertheless, the many published studies have produced somewhat conflicting results. Various radiological criteria have been used to define degeneration of the adjacent disc. Although most patients have no symptoms, adverse effects on the spine and/or nerve roots may occur and, in some cases, require revision surgery. We draw attention to the many sources of bias in the published studies, of which we provide a critical and pragmatic discussion in the light of our personal experience.

The mini-invasive anterior extra peritoneal approach to the pelvis.

Retroperitoneal pelvic tumours are rare and their surgical approach is challenging. Various surgical approaches have been proposed. We present here an original mini-invasive anterior retroperitoneal approach the pelvic retroperitoneum, which was successful in a 26-year-old woman who had a benign schwannoma of the left sacral plexus. This technique presents advantages over other techniques that were considered in this case, as the least invasive and safest procedure.

Cervical spine surgery in ankylosing spondylitis: Review and current concept.

Ankylosing spondylitis of the cervical spine is associated with stiff kyphosis and increased risk of transversal unstable fracture. A spine surgeon may be involved mainly in the management of trauma cases, but in some situations, corrective surgery of a kyphotic cervical deformity is needed. Both types of cases carry specific aspects and rely on principles that differ from those associated with more common cervical surgery. This paper is a review of the literature regarding cervical surgery in cases of ankylosing spondylitis. It addresses practical technical questions.

[Long-term results of alumina-on-alumina total hip arthroplasty]. / Résultats à long terme du couple de frottement alumine/alumine sur 98 prothèses de hanche cimentées.

PURPOSE OF THE STUDY: Mechanical failure in total hip arthroplasty is usually related to aseptic loosening itself related to wear particles as seen with polyethylene bearings. Alumina has bee proposed to avoid wear problems. In vitro and mid-term clinical studies have shown tribological advantages but early acetabular fixation remains an issue. Since alumina-on-alumina bearings are currently used with new fixation techniques, updated evaluations of older series are informative regarding the long-term tolerance of alumina in vivo. MATERIAL AND METHODS: We investigated 104 consecutive alumin-on-alumina cemented total hip arthroplasties (Cervaer-Osteal, Roissy, France) implanted 20 years ago in 81 patients (from 1979 to 1983). A32-mm alumina femoral head was used. The alumina acetabular socket and the titanium femoral stem were cemented. The Postel-Merle-d'Aubigne score was used for clinical evaluation. Radiological wear and development of osteolysis or loosening were noted for establishing actuarial curves. When accessible, histological samples from revision procedures were analyze. RESULTS: Six infected cases were not taken into account for data analysis. The average follow-up was 11 years, reaching 18 years in 38 cases. Twenty-three hips were revised for changing 23 acetabular sockets, 12 femoral heads, and one femoral stem. We noted one femoral head fracture, 24 definite acetabular loosenings, 12 probable acetabular loosenings, and 3 definite femoral loosenings. Radiological acetabular osteolysis was present in 4 cases, always limited to De Lee zone 1, and associated with loosening. Radiological wear was below eye detection. Periprosthetic tissue showed non-specific histological reactions to cement particles. Survival rate at 20 years was 62.8% [49.3-76.2%], in terms of revision 57.1% [42.5-71.7%] and 95.2% [89.9-100%] in terms of definite acetabular and femoral loosening. DISCUSSION: Besides the high rate of cemented fixation failure of the socket, loosened and non-loosened cases showed an excellent long-term tolerance of the alumina-on-alumina bearing with normal wear and osteolysis. This may also have protected the femoral component from complications. This study confirms in vivo the long-term tribological benefit of the alumina-on-alumina bearing in total hip arthroplasty and suggests that acetabular fixation should be improved to achieve full benefit.

[Pectineal ligament of Cooper. Micromorphometric study]. / Ligament pectinéal de Cooper. Etude micromorphométrique.

The pectineal ligament is used in surgery as a support element in the treatment of groin hernias and female urinary stress incontinence. The question is to determine the anatomical characters that account for its strength. Three complementary approaches have been considered: an anatomical dissection study established the origin of the different fibers the ligament is composed of; a morphometric study determined the areas where the ligament is the thickest; and microscopic anatomy clearly showed the arrangement of the fibers. The pectineal ligament continues the near-by fibers fibrous elements, notably thanks to its ends. The latter are significantly thicker. At microscopic level, the regular layout of the pectineal ligament fibers accounts for its resistance.

Lumbar-pelvic-femoral balance on sitting and standing lateral radiographs.

Trunk balance in upright stance expresses an individual postural strategy found on anatomic and functional parameters. The "pelvic vertebra" is an essential transitional region for the coherence of spinal parameters (notably, lumbar lordosis and thoracic kyphosis) and pelvic parameters (sacral slope, pelvic tilt and incidence). Deterioration of this postural harmony is often associated with spinal aging, maladjusted spinal arthrodeses, or mechanical abnormalities of the hip joints. Spinal surgeons are aware of the importance of detecting and analyzing sagittal imbalance, whether compensated or not. The influence of the hip joint, however, is underestimated and poorly objectified on conventional imaging, as are its interrelations with overall lower-limb posture. Currently, hip surgeons focus basically on the pelvis as bone reference in planning implantation, peroperative adjustment and failure analysis. The antero-posterior (AP) pelvic view is the gold standard, with lateral views being little used. Influenced by the classic anatomic attitude in favor of transverse slices in dorsal decubitus, CT is considered the reference method for "horizontal" assessment of the hip joint. The present study draws attention to a more global vision of the pelvic and subpelvic regions in the sagittal balance of the trunk, relying on the sitting as well as the standing posture, as both involve subtle mechanisms of adaptation governed by the pelvic incidence angle.

Unstable odontoid fracture: surgical strategy in a 22-case series, and literature review.

Surgical treatment of unstable odontoid fracture (type II OBAR or HTAL) has progressed, with a range of techniques, the specificities of which need to be known so as to determine their respective roles in the therapeutic arsenal now available. A retrospective study of 22 patients operated on in our center for odontoid fracture between 2005 and 2010 examined the operative techniques employed and analyzed results in the light of the literature, so as to construct an updated decision tree. Two populations could be distinguished: elderly victims of simple fall (mean age, 82.1 years), and younger victims of high-energy trauma (mean age, 42.6 years). Surgical techniques comprised: anterior odontoid screwing (n=14), transarticular C1-C2 screwing on the posterior Magerl (n=3) or anterior Vaccaro approach (n=1), Harms' posterior C1-C2 arthrodesis (n=3), and occipitocervical arthrodesis (n=3). The overall complications rate for the series was 28%, including one case of non-union, at a mean 11 months' follow-up. The risk/benefit ratio may be hard to assess in elderly patients. However, anterior screwing restores odontoid anatomy and is the technique of choice in first intention for reducible fracture. In second intention, transarticular C1-C2arthrodesis may be performed on an anterior or posterior approach, depending on local vertebral artery anatomy. Harms' posterior C1-C2 arthrodesis allows fixation of non-reduced fractures. Occipitocervical arthrodesis is a last resort, as the associated morbidity rate is higher.

Salvage technique for postoperative infection and necrosis of the Achilles tendon.

Surgery of the Achilles tendon is associated with postoperative morbidity related to wound healing. Necrotic infection of the tendon is a rare but serious complication that may be associated with increasingly invasive surgical treatments using various free flap transfers proposed in the literature. Dealing with this complication, we prefer the technique of managed wound healing suggested by Dautry. The surgical procedure includes radical debridement of the infected tissue and necrotic Achilles tendon followed by managed wound healing with daily irrigation. Fifteen cases were treated between 1994 and 2003. Healing was achieved after 30 to 100 days. MRI results show scar tissue continuity suggesting a neotendon formation. Function was very satisfactory in 9/15 ankles. The salvage technique presented here for cases of infection and necrosis of the Achilles tendon is simple with low morbidity and results in effective wound and tendon healing with satisfactory functional and anatomical results.

The EOS imaging system for understanding a patellofemoral disorder following THR.

An aspect of patellofemoral syndrome secondary to total hip replacement (THR) is mainly suggestive of a problem of femoral implant torsion. We here present the first reported case of patellofemoral syndrome secondary to THR relating to limb-length discrepancy, with no abnormality of femoral torsion. The pelvis adapted to the length inequality by axial rotation rather than frontal tilt, and this went undetected on standard X-ray and CT-scan. 3D imaging in upright posture on the EOS system enabled the situation to be clearly described and analyzed, and adapted surgical correction to be indicated.

Infections in the operated spine: update on risk management and therapeutic strategies.

UNLABELLED: Among the possible risks of spine surgery, surgical site infection (SSI) is far from negligible. Incidence is higher than in other locomotor system procedures, with more severe local and general impact. Certain broad guidelines can be formulated. The risk of SSI should be taken into account in the choice of treatment options discussed with the patient. Antibiotic prophylaxis, surgical prevention of iatrogenic infection and an SSI surveillance protocol should be implemented. SSI should be suspected in case of any abnormality in postoperative course, and biological and imaging (MRI or CT) measures should be taken. Local sampling for bacteriological identification is mandatory. Treatment strategy should ideally be discussed in a multidisciplinary coordination meeting, and adapted in the light of local bacterial ecology and resistance data. The information provided to the patient should be transparent and adapted to the patient's individual context. LEVEL OF EVIDENCE: Level V.

Pelvis and total hip arthroplasty acetabular component orientations in sitting and standing positions: measurements reproductibility with EOS imaging system versus conventional radiographies.

INTRODUCTION: The literature has recently underlined the interest of pelvic and acetabular component orientation measurements in the standing and sitting position. Radiographic follow-up of total hip arthroplasty (THA) is based on standard AP and lateral X-rays. The use of EOS™ 2D imaging system reduces patient's radiation exposure compared to conventional X-rays. However, using this system, the validity and reproducibility of angular measurements, have not been studied yet for the measurement of pelvic and acetabular parameters in patients with THA. HYPOTHESIS: The EOS™ 2D imaging system offers similar advantages to conventional X-rays in the measurement of pelvic and acetabular orientation parameters which are commonly used. PATIENTS AND METHOD: Five angular parameters characterizing pelvic tilt and acetabular cup orientation were determined using the same digital measurement Imagika™ software based on two series of standard X-rays and EOS™ 2D images acquired in both standing and sitting positions. Radiographs from 50 patients with unilateral THA were measured three times by two observers. Intra- and interobserver reproducibility using each method was independently studied then paired comparison was performed. RESULTS: The ICC and Spearman rank correlation coefficient demonstrated an excellent EOS/conventional X-ray correlation. According to the parameters, the mean difference between these two imaging modalities ranged from 0.30° to 3.43° (P<0.05). The intra- and interobserver variability ranged from ± 2.97° to ± 6.46° using the EOS™ imaging system and from ± 4.26° to ± 10.22° using conventional X-rays (P<0.05). DISCUSSION: The EOS™ 2D imaging system may replace conventional X-rays in the assessment and monitoring of pelvic and acetabular cup orientation in THA. LEVEL OF EVIDENCE: Level III. Prospective diagnostic study.

Pneumorachis: a possible source of traumatic cord compression.

The presence of air within the spinal canal secondary to trauma is a rare condition. These rare cases are generally asymptomatic. We report our first case of closed thoracic trauma with pneumorachis associated with neurological disorders. According to a review of the literature and after personal record analysis, neurologic symptoms can be correlated to the occurrence of intraspinal air. Therefore pneumorachis appears as a possible cause of traumatic spinal cord compression. In this particular case, pneumorachis spontaneously resolved and early outcome was favourable.

Hip spine relationships: application to total hip arthroplasty.

Lumbo-sacral orientation in the sagittal plane is of utmost importance, as it plays a critical role in the function of the spine and the hip joints. Equilibrium of the trunk influences the tridimensional orientation of the acetabulum and the functional range of motion of the hips. Each patient is characterized by a "morphological" parameter named incidence angle; its sagittal balance is the consequence of a postural adaptation for other functional parameters (pelvic tilt, sacral slope, lumbar lordosis, acetabular sagittal tilt, functional anteversion). Understanding variations of the sacral slope on lateral pelvic X-rays is essential for planning total hip arthroplasty and identifying patients at risk of impingement, as lumbosacral posture influences functional anteversion of the acetabulum. Posterior pelvic version as in sitting position (sacral slope decrease) is linked to the increase of the functional acetabular anteversion. Anterior pelvic version as in standing position (sacral slope increase) is linked to the decrease of the functional acetabular anteversion.