Orthopaedics & Traumatology-Surgery & Research最新文献

Posterior shoulder instability (PSI) is defined by dynamic, recurrent and symptomatic partial or total loss of posterior joint contact. Anatomic risk factors comprise ligament hyperlaxity, glenoid retroversion or dysplasia, and high horizontal acromial morphology. Associated anatomic lesions comprise labrum lesions, posterior glenoid erosion and/or fracture, and anterior humeral head notching. We distinguish two subcategories of PSI: functional and structural, respectively without and with anatomic lesions. In both categories, there may be anatomic risk factors. Clinically, functional PSI involves reproducible asymptomatic voluntary subluxation or sometimes reproducible involuntary subluxation. Functional PSI implicates impaired external-rotation rotator cuff and scapular stabilizer muscle activity. Treatment is non-operative, by rehabilitation and shoulder pace maker. Structural shoulder instability involves anatomic lesions, often due to iterative microtrauma; pain is the most frequent symptom. It usually concerns young athletic subjects, but the clinical forms of structural and of anterior shoulder instability are not superimposable. Treatment may be surgical; arthroscopic labrum repair is effective in the absence of significant bone lesions, whereas otherwise posterior bone block is the treatment of choice. Surgical treatment of scapular features underlying structural PSI is improved by 3D preoperative planning, cutting guides and dedicated internal fixation systems. LEVEL OF EVIDENCE: expert opinion.

Osteoporotic fractures in the elderly are increasingly numerous, but diaphyseal locations on native bone are quite rare. Pathological and periprosthetic fractures are not included in this review, as they are specific in terms of context and treatment. Cortical thinning and widening of the medullary canal alter local mechanical properties, necessitating adaptation of internal fixation. Thus, for nailing, the diameter of the implant has to be greater, and fixed-angle or multidirectional locking screws are used; for plate fixation, locking screws are required. To avoid secondary periprosthetic fracture, fixation must protect the entire bone segment. Long plates should be used, with several divergent epiphyseal end-screws; in the femur, cervicocephalic proximal fixation is recommended. In practice, nailing is mostly used in femoral and tibial isthmic locations. In case of metaphyseal extension, nail and locking plate fixation, ideally percutaneous, show comparable results in terms of function, consolidation and complications. In the tibia, it is mandatory to be soft-tissue friendly given the fragility of pretibial skin in the elderly. In the humerus, the choice is wider. For nailing, passage through the rotator cuff seems acceptable in elderly patients. LEVEL OF EVIDENCE: V; expert opinion.

Nerve injury is the most feared complication of upper limb surgery. In about 17% of cases, the injury is iatrogenic and the potential for recovery is poor. In this context, patients file for compensation in about a quarter of cases. Defective patient installation or locoregional anaesthesia are rarely the cause of nerve injury. Nerves may be injured during creation of the surgical approach, implantation of the material or reduction of a traumatic injury. The injury is usually related to nerve release, retractor positioning or inappropriate limb-segment lengthening. Stretching and/or compression of a nerve trunk or branch is thus often the main cause. Among diagnostic tools, imaging studies (ultrasonography, computed tomography, and magnetic resonance imaging) provide information on nerve structure but not on the potential for recovery. Electromyography combined with a neurological examination establishes the diagnosis, guides the management strategy, allows nerve-function monitoring, and indicates when nerve repair or palliative surgery is indicated. Electromyography also has prognostic value, both at diagnosis and during follow-up, by showing whether nerve regeneration is taking place. When creating the surgical approaches, thorough familiarity with anatomic safe zones and nerve trajectories is crucial to ensure full control of the zones at highest risk for nerve injury. LEVEL OF EVIDENCE: IV.

Ruptures of the quadriceps tendon (QT) are rare but serious injuries accounting for less than 2% of all tendon injuries around the knee. These injuries, often occurring in individuals over 40, are leading to a loss of active extension and a significant impact on knee function. While the treatment of acute QT ruptures through various reinsertion techniques has shown excellent outcomes, managing chronic injuries and failed primary repairs remains challenging due to tendon retraction and difficulties in repositioning the tendon stump. This study introduces a novel approach associating direct tendon reinsertion with metal frame reinforcement, aiming to effectively lower the retracted tendon to the proximal pole of the patella. This technique offers a promising alternative that addresses the limitations of traditional methods and potentially improves patient outcomes by providing a safe primary fixation and protection of the repair, enabling early rehabilitation and reducing the need for subsequent interventions. LEVEL OF EVIDENCE: IV; case series study.

Background: Although virtual reality (VR) simulators have demonstrated their efficiency for basic technical skill training of healthcare professionals, validation for more complex and sequential procedures, especially in arthroscopic surgery, is still warranted. We hypothesized that the VR-based training simulation improves arthroscopic cuff repair skills when transferred to realistic visual and haptic conditions.

Hypothesis: VR-based training simulation improves arthroscopic cuff repair skills when transferred to realistic visual and haptic conditions.

Study design: This study is prospective, multicentric and randomized.

Methods: Thirty orthopedic surgery residents were enrolled in the study and randomized in two groups: VR training (VR+) and no VR training (VR-). Only the VR+ group underwent a monthly VR-based training program for rotator cuff repair. The 1-h VR training sessions were standardized and supervised by the same instructor. After six months, all participants performed a double-row arthroscopic rotator cuff repair procedure on a benchtop shoulder model providing realistic visual and haptic conditions with implants. Two independent surgeons with expertise in shoulder repair and blinded to the randomization rated the participants' performance using the Arthroscopic Surgical Skill Evaluation Tool (ASSET).

Results: Demographic characteristics and surgical experience were comparable between the two groups. The ASSET global rating score was higher in the VR+ group than in the VR- group (34.4 ± 3.1 and 30.5 ± 5.7, respectively; p = 0.046) and the VR+ group performed the procedure faster than the VR- group (27.3 ± 3.6 vs. 31.7 ± 0.4 min, respectively; p = 0.003).

Discussion: This study demonstrated that a monthly VR-based program for 6 months was better than standard peer training alone for mastering a complex and sequential rotator cuff repair when using the validated ASSET Score. Overall, nonspecific arthroscopic skills were also higher in the VR+ group.

Level of evidence: II, therapeutic study.

Background: The medial collateral ligament (MCL) and lateral collateral ligament (LCL) are paramount for joint stability. Their elongation patterns may change during fixed-bearing and mobile-bearing unicompartmental knee arthroplasty (FB and MB UKA). This study aims to explore the relationship between the elongation of MCL, LCL, and changes in joint space, as well as their correlation with functional scale scores during FB and MB UKA.

Hypothesis: We hypothesize that MCL and LCL have different elongation patterns in UKA patients, and there is a correlation between elongation and joint space and functional scores.

Materials and methods: The study recruited 24 patients undergoing UKA on a unilateral knee (13 FB and 11 MB). A dual fluoroscopic imaging system was employed to assess in-vivo knee kinematics during static standing and single-leg lunge. The superficial and deep MCL (sMCL, dMCL) and LCL were divided into anterior, medium, and posterior portions. The virtual ligament method quantified in-vivo ligament lengths. Analysis focused on the correlation of normalized ligament lengths with functional scores and joint space.

Results: 1. LCL Elongation in FB UKA: There is a significant increase in LCL elongation during early and mid-flexion of the single-leg lunge (p < 0.05). 2. MCL Elongation in MB UKA: Both sMCL and dMCL exhibit significant elongation during early and mid-flexion of the single-leg lunge (p < 0.05). 3. Correlation with Functional Scores: Differences in collateral ligament elongation in FB UKA are significantly correlated with the OKS and KSS, highlighting the impact on functional outcomes. In MB UKA, differences in ligament elongation are significantly correlated with the FJS. 4. Joint Space Correlation: There is a significant correlation between the elongation of the anterior and medium portions of dMCL and joint space in the surgical compartment during mid- and deep flexion (30-100°, p < 0.05, r > 0.64).

Conclusion: The study reveals distinct ligament elongation patterns between UKA and native knees in LCL for FB UKA and MCL for MB UKA. These patterns are associated with knee functional scores. Moreover, dMCL elongation correlates significantly with the joint space for MB UKA during middle and deep flexion phases.

Level of evidence: III; prospective retrospective cohort study.

Introduction: Dupuytren's disease is a benign disorder leading to flexion contracture of the fingers and functional disability. Many treatments have been described. Open fasciectomy is the gold standard; however percutaneous needle fasciotomy (PNF) is a reliable option for uncomplicated primary contracture but it has a high rate of recurrence.

Hypothesis: A history of PNF treatment before open fasciectomy is a risk factor for postoperative complications.

Material and methods: A retrospective single-center study was conducted involving 56 patients (62 hands) who were operated for Dupuytren's contracture by open fasciectomy between November 2016 and November 2020. We compared the outcomes of patients with history of prior PNF on the same finger (group A) to patients without history of PNF (group B). There was no significant difference between the two groups in the severity, comorbidities or preoperative finger mobility. The primary outcome was the complication rate during surgery or during the follow-up period (mean follow-up of 2 years).

Results: The intra- and postoperative complication rate was 26% (n = 9) in group A (history of PNF) versus 9% (n = 4) in group B (no PNF) (p = 0.0482), corresponding to a relative risk for complications of 2.8 (95% CI: 1.2-6.4) in case of previous PNF. Tourniquet time per operated ray was higher in group A than in group B (34.1 min versus 24.9 min, p = 0001).

Discussion: A history of PNF for Dupuytren's disease can lead to a higher rate of major intraoperative or postoperative complications when open fasciectomy is performed compared to open fasciectomy as a first-line therapy.

Level of evidence: III; retrospective comparative study.