Martti Lakovaara

Hook-plate fixation of unstable lateral clavicle fractures: A report on 63 patients

Background Hook-plate fixation of unstable lateral clavicle fractures has given promising results in previous reports, but numbers of patients have been small. We assessed the results of this technique in 63 patients. Patients and methods 63 patients with unstable lateral clavicle fractures were operated on at Oulu University Hospital during 1997–2004, using a clavicle hook-plate. Fracture union and complications were assessed retrospectively from case records and radiographs. The subjective part of the Constant score, Oxford shoulder questionnaire data and subjective shoulder value (SSV) were assessed after an average of 3.6 years in 58 patients. 31 patients were reviewed at the outpatient clinic, using complete Constant scores and radiographs of both acromioclavicular joints. Results 59 fractures united uneventfully. There was 1 case of delayed union and 3 nonunions, but only 1 of these required surgery. Additional complications involved 1 case of infection, 1 frozen shoulder and 3 cases of late fracture medial to the plate. The mean Oxford score was 15, the mean for the subjective part of the Constant score was 32, and the SSV was 86%. Interpretation Clavicle hook-plate fixation of unstable lateral clavicle fractures results in a good union rate and good shoulder function.

Intramedullary nailing of humeral shaft fractures. A retrospective study of 126 cases.

Antegrade intramedullary nailing with four different implants was used in 126 humeral shaft fractures. There were 74 acute fractures, 17 pathologic fractures, 16 fractures malaligned in a hanging cast or brace, 15 fractures with delayed union and 4 fractures that were nailed after failed open reduction and internal fixation. The nonunion rate was 21/95 after primary operation, and after reoperations 14/95. Distraction of the fracture was a significant cause of nonunion, but not type of fracture, localization, implant, and delay between injury and surgery. Shoulder joint function was significantly impaired in 25/67 patients. The patients regarded the result as good or satisfactory in 41/67 of the cases who were followed mean 3 (0.5-10) years. We conclude that antegrade intramedullary nailing of humeral shaft fractures leads to a substantial risk of non-union and impairment of shoulder function. It can be recommended as primary treatment only when nonoperative treatment is likely to fail.

Intraoperative assessment of the stability of the distal tibiofibular joint in supination-external rotation injuries of the ankle: sensitivity, specificity, and reliability of two clinical tests.

BACKGROUND This study was designed to assess the sensitivity, specificity, and interobserver reliability of the hook test and the stress test for the intraoperative diagnosis of instability of the distal tibiofibular joint following fixation of ankle fractures resulting from supination-external rotation forces. METHODS We conducted a prospective study of 140 patients with an unstable unilateral ankle fracture resulting from a supination-external rotation mechanism (Lauge-Hansen SE). After internal fixation of the malleolar fracture, a hook test and an external rotation stress test under fluoroscopy were performed independently by the lead surgeon and assisting surgeon, followed by a standardized 7.5-Nm external rotation stress test of each ankle under fluoroscopy. A positive stress test result was defined as a side-to-side difference of >2 mm in the tibiotalar or the tibiofibular clear space on mortise radiographs. The sensitivity and specificity of each test were calculated with use of the standardized 7.5-Nm external rotation stress test as a reference. RESULTS Twenty-four (17%) of the 140 patients had a positive standardized 7.5-Nm external rotation stress test after internal fixation of the malleolar fracture. The hook test had a sensitivity of 0.25 (95% confidence interval, 0.12 to 0.45) and a specificity of 0.98 (95% confidence interval, 0.94 to 1.0) for the detection of the same instabilities. The external rotation stress test had a sensitivity of 0.58 (95% confidence interval, 0.39 to 0.76) and a specificity of 0.96 (95% confidence interval, 0.90 to 0.98). Both tests had excellent interobserver reliability, with 99% agreement for the hook test and 98% for the stress test. CONCLUSIONS Interobserver agreement for the hook test and the clinical stress test was excellent, but the sensitivity of these tests was insufficient to adequately detect instability of the syndesmosis intraoperatively.

Syndesmotic Fixation in Supination-External Rotation Ankle Fractures A Prospective Randomized Study

Background: This study compared mid-term functional and radiologic results of syndesmotic transfixation with no fixation in supination external rotation (SER) ankle fractures with intraoperatively confirmed syndesmosis disruption. Our hypothesis was that early-stage good functional results would remain and unfixed syndesmosis disruption in SER IV ankle fractures would not lead to an increased incidence of osteoarthritis. Methods: A prospective study of 140 operatively treated patients with Lauge-Hansen SER IV (Weber B) ankle fractures was performed. After bony fixation, the 7.5-Nm standardized external rotation stress test for both ankles was performed under fluoroscopy. A positive stress examination was defined as a difference of more than 2 mm side-to-side in the tibiotalar or tibiofibular clear spaces on mortise radiographs. The patients were randomized to either syndesmotic screw fixation (13 patients) or no syndesmotic fixation (11 patients). After a minimum of 4 years of follow-up (mean, 58 months), ankle function and pain (Olerud-Molander, a 100-mm visual analogue scale [VAS] for ankle function and pain) and quality of life (RAND-36) of all 24 patients were assessed. Ankle joint congruity and osteoarthritis were assessed using mortise and lateral projection plain weight-bearing radiographs and magnetic resonance imaging (MRI; 3T) scans. Results: Improvement in Olerud-Molander score, VAS, and RAND-36 showed no significant difference between groups during the follow-up. In the syndesmotic transfixation group, improvements in all functional parameters and pain measurements were not significant, whereas in the group without syndesmotic fixation, the Olerud-Molander score improved from 84 to 93 (P = .007) and the pain (VAS) score improved from 11 to 4 (P = .038) from 1 year to last follow-up. X-ray or MRI imaging showed no difference between groups at the last follow-up visit. Conclusion: With the numbers available, no significant difference in functional outcome or radiologic findings could be detected between syndesmosis transfixation and no-fixation patients with SER IV ankle fracture after a minimum of 4 years of follow-up. Level of Evidence: Level II, prospective comparative study.

Staged method using antibiotic beads and subsequent autografting for large traumatic tibial bone loss: 22 of 23 fractures healed after 5-20 months.

Introduction The vascularity of surrounding soft tissues, which is related to muscle cover, is important for the healing of traumatic bone loss. Muscle cover on the distal tibia is limited compared to the diaphyseal and proximal tibia, and delayed healing of fractures in this area is common. We evaluated the healing of traumatic bone loss in the proximal, diaphyseal, and distal tibia. Patients and methods 23 open tibial fractures with substantial bone loss (mean 52 (34–104) mm) were treated using a staged method with antibiotic-impregnated beads and later autologous bone grafting at second-stage surgery on average 8 weeks after the injury. Results 22 fractures healed after mean 40 (20–79) weeks. The average healing time in the distal tibia (mean 30 weeks) was 7 weeks shorter (95% CI: 12–26 weeks) than in the proximal tibia (37 weeks), and 16 weeks shorter (95% CI: 3–29 weeks) than in the tibial shaft (47 weeks). The length of the bone and the type of soft tissue cover (free muscle or secondary suture) had no effect on healing time. Interpretation Our study suggests that the method we used is applicable in all parts of the tibia, although the healing of bone loss is slower in the diaphyseal tibia than in the proximal and distal tibia.

Quantitative MRI of Human Cartilage In Vivo: Relationships with Arthroscopic Indentation Stiffness and Defect Severity:

Objective To investigate the association of cartilage defect severity, as determined by the International Cartilage Repair Society (ICRS) grading with indentation stiffness and T2 relaxation time of magnetic resonance imaging (MRI), a biomarker for the integrity of articular cartilage. Design Twenty-one patients scheduled for arthroscopic were included in the study. Prior to arthroscopy, subjects underwent quantitative MRI of articular cartilage, namely T2 relaxation time mapping at 1.5 T. Within 2 months, subjects underwent arthroscopy, which also included ICRS grading and measurement of arthroscopic indentation stiffness. Arthroscopic evaluations and T2 mapping at anterior, central, and posterior medial and lateral femoral condyles were correlated using a colocalization scheme. Differences in Young’s modulus, as derived by indentation tests, and T2 times between ICRS grades were analyzed using Mann-Whitney’s U or Kruskal-Wallis H tests. The correlation between modulus and T2 times was analyzed using Spearman’s rank correlation coefficients. Results Modulus and T2 showed significant topographical variation. In the anterior region of interest (ROI) on the medial condyle the modulus showed a negative association with ICRS grade (P = 0.040) and the T2 times were longer in ICRS grade 2 compared with grades 0 and 1 (P = 0.047). Similar, but nonsignificant associations were found in the central ROI on the medial condyle. No significant correlations were observed between the indentation modulus and T2 times. Conclusions Cartilage degeneration is identified both with mechanical indentation and T2 mapping in MRI. However, in this study, indentation stiffness and T2 relaxation time in vivo, were not associated.

Towards Regionalized Care of Severe Orthopedic Injuries: A Survey on Non-university Hospitals in Finland

IntroductionThe principles of a designated trauma system and regionalization of trauma care exist in very limited areas in Finland. In this study, we obtained information on the current personal opinions of orthopedicsin-chief (OICs) and surgeons-in-chief (SICs) towards regionalization of severe orthopedic trauma care in Finland.Materials and Methods:A questionnaire was sent to OICs and SICs working in 36 primary and secondary hospitals providing acute surgical care asking to give their personal opinions whether certain severe orthopedic injuries should be managed in their hospitals or be referred.Results:The overall response rate was 49/67 (73%). In general, SICs tended to be more reluctant to refer patients to higher level facilities. Both OICs and SICs were more willing to refer spinal and pelvic injuries than complicated long bone fractures.Conclusions:There seems to be major differences in personal views on referral policy between OICs and SICs. This information is useful prior to discussions by the professional organizations, hospitals, and the government in establishing a modern orthopedic trauma system in Finland.