IntroductionPain is the most common symptom in patients presenting with spinal metastasis without neural compromise. Surgery, radiotherapy and vertebroplasty are all effective treatments alone or in combination. According to Boland et al. [1], early aggressive treatment may be considered to avoid cord compression. The aim of this study is to determine indications and strategy of surgical treatment related to the length of survival and to the risk of recurrence. Materials and methodsOne hundred and seven patients were operated on for spinal metastasis without spinal cord compression. There were 54 women and 53 men, with a mean age of 58 (range 29-87). Neoplasm was revealed by spinal metastasis in seven cases. In the other cases, neoplasm had been known about for a mean period of 30 months (range 0-288 months). The primary tumour was predominantly lung neoplasm (37 cases), followed by breast neoplasm (30 cases), unknown (9 cases), kidney (8 cases), digestive tract (6 cases), others (17 cases). There were only two cases of primary prostate neoplasm. Back pain was the main symptom in all cases, with radiculopathy in 43 cases. Pyramidal irritation (Babinski sign, hyper-reAbstract Surgery in patients presenting with vertebral metastasis without neural deficit is controversial. A series of 107 patients (54 female, 53 male) were operated on at a mean age of 58. The metastasis was the first manifestation of the cancer in seven cases. In 100 patients, the cancer had been diagnosed 30 months earlier (average). Vertebral pain was present in all cases, with associated radicular pain in 43 cases. Pyramidal irritation without neural deficit was present in seven cases. The mean preoperative Karnofsky index was 64.7%. The mean preoperative Tokuhashi score was 8.6. The surgical approach depended on the topography of the metastasis. Ninety-three patients were dead at review, with a mean survival of 8 months. Seventeen patients underwent further spinal surgery, for local recurrence in nine cases, and for another spinal localization in eight cases, after a mean interval of 8 months. Recurrence occurred at the same level in all seven patients presenting with neural deficit at recurrence. Among ten recurrences without neural deficit, two were observed at the same level and eight were observed on another level. Surgery in vertebral metastasis without neural deficit results in substantial functional improvement, but does not increase the duration of life. For kidney metastasis, total vertebrectomy must be performed because of the risk of recurrence. For thyroid metastasis, total vertebrectomy is a good alternative to increase the efficacy of iodotherapy. In other cases, for patients with good general status, surgery must be adapted to the location of the involvement.

Although in theory, the differences in design between fixed-core and mobile-core prostheses should influence motion restoration, in vivo kinematic differences linked with prosthesis design remained unclear. The aim of this study was to investigate the rationale that the mobilecore design seems more likely to restore physiological motion since the translation of the core could help to mimic the kinematic effects of the natural nucleus. In vivo intervertebral motion characteristics of levels implanted with the mobile-core prosthesis were compared with untreated levels of the same population, levels treated by a fixed-core prosthesis, and normal levels (data from literature). Patients had a single-level implantation at L4L5 or L5S1 including 72 levels with a mobile-core prosthesis and 33 levels with a fixed-core prosthesis. Intervertebral mobility characteristics included the range of motion (ROM), the motion distribution between flexion and extension, the prosthesis core translation (CT), and the intervertebral translation (VT). A method adapted to the implanted segments was developed to measure the VT: metal landmarks were used instead of the bony landmarks. The reliability assessment of the VT measurement method showed no difference between three observers (p \ 0.001), a high level of agreement (ICC = 0.908) and an interobserver precision of 0.2 mm. Based on this accurate method, this in vivo study demonstrated that the mobile-core prosthesis replicated physiological VT at L4L5 levels but not at L5S1 levels, and that the fixed-core prosthesis did not replicate physiological VT at any level by increasing VT. As the VT decreased when the CT increased (p \ 0.001) it was proven that the core mobility minimized the VT. Furthermore, some physiologic mechanical behaviors seemed to be maintained: the VT was higher at implanted the L4L5 level than at the implanted L5S1 level, and the CT appeared lower at the L4L5 level than at the L5S1 level. ROM and motion distribution were not different between the mobile-core prosthesis and the fixedcore prosthesis implanted levels. This study validated in vivo the concept that a mobile-core helps to restore some physiological mechanical characteristics of the VT at the implanted L4L5 level, but also showed that the minimizing effect of core mobility on the VT was not sufficient at the L5S1 level.

Madelung's deformity was first described in 1878. It is characterised by a typical deformity of the carpus and not only causes pain but also impedes mobility and aesthetic appearance. Surgical correction can be effected during adolescence, the most frequently employed technique being conical osteotomy. We present a novel technique of lengthening and aligning the distal radial extremity using Ilizarov's technique. Five carpal joints were operated on in three 13-year old girls. An aesthetic effect was obvious in all the cases. Mobility improved by 30 degrees in the direction of the extension and pain always subsided directly after surgery.

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