High re-operation and complication rates 11 years after arthrodesis of the wrist for non-inflammatory arthritis.

AIMS: Plate and screw fixation has been the standard treatment for painful conditions of the wrist in non-rheumatoid patients in recent decades. We investigated the complications, re-operations, and final outcome in a consecutive series of patients who underwent wrist arthrodesis for non-inflammatory arthritis. PATIENTS AND METHODS: A total of 76 patients, including 53 men and 23 women, with a mean age of 50 years (21 to 79) underwent wrist arthrodesis. Complications and re-operations were recorded. At a mean follow-up of 11 years (2 to 18), 63 patients completed questionnaires, and 57 attended for clinical and radiological assessment. RESULTS: Of the 76 patients, 46 (60.5%) had complications, resulting in 65 re-operations, mainly related to the plate and screws. In the 63 patients who completed the questionnaires, the mean Quick Disabilities of Arm, Shoulder and Hand (QuickDASH) score was 36 (0 to 91), the mean Patient-Rated Wrist and Hand Evaluation (PRWHE) score was 40 (0 to 96), and 14 patients (22%) reported no wrist pain. Grip strength, pinch strength, and pronation and supination were significantly reduced compared with the contralateral forearm. The outcome was worse in patients who had previously undergone surgery to the wrist, and those with complications. A total of 13 are awaiting further re-operations, giving a total re-operation rate of 63% (40/63). CONCLUSION: We observed complications and re-operations throughout the follow-up period and therefore consider wrist arthrodesis to be more complicated than previously assumed. Many of the patients never got used to or accepted their stiff wrists and reported a substantial reduction in function and residual pain. Motion-sparing surgery should be offered prior to wrist arthrodesis. Cite this article: Bone Joint J 2019;101-B:852-859.

Cold hypersensitivity after hand injuries. A prospective 7-year follow-up.

We studied changes in cold hypersensitivity from 3 to 7 years following severe hand injuries. Data was collected using postal questionnaires 7 years after injury in 71 patients who had participated in a 3-year follow-up from the time of injury. There was no change in cold sensitivity measured using the McCabe Cold Sensitivity Severity scale (CSS) from 3 to 7 years after injury. However, there was a trend toward decreased severity measured using a five-level scale of self-reported cold hypersensitivity. Compared to the 3-year follow-up, fewer respondents rated their condition as severe and two patients had recovered from their cold hypersensitivity at the 7-year follow-up. Furthermore, 21 (30%) of the respondents stated a decrease in cold hypersensitivity during the last 2 years. Limitations in cold associated activities and the importance of being less limited in leisure activities (NRS 0-10) did not change between the two follow-ups. In conclusion, the CSS-scores did not change from 3 to 7 years after injury. Several patients experienced improvements in cold hypersensitivity, but few recovered completely from the condition.

Chrome nitride coating reduces wear of small, spherical CrCoMo metal-on-metal articulations in a joint simulator.

Metal-on-metal articulations have fallen out of favour in larger joint replacements, but are still used in smaller joints. Coating the articulation has been suggested as one way of reducing wear. We compared a standard 6 mm CrCoMo articulation designed for the carpometacarpal joint of the thumb with a chromium nitride-coated version after 512,000 cycles in a joint simulator. A total of 6 articulations in each group were tested with a unidirectional load of 5 kg in Ringer's solution. We found a statistically significant reduction in weight loss, amount of metallic wear produced and volumetric wear for the chromium nitride-coated articulation. Our findings support the use of chromium nitride coating in order to minimize the amount of metallic wear produced.

Successful conversion of wrist prosthesis to arthrodesis in 11 patients.

From 2001 to 2015, 11 wrists in 11 patients with osteoarthritis of the wrist had failed wrist arthroplasties, which were subsequently converted to arthrodesis using intercalated corticocancellous autograft from the iliac crest and fixation with an arthrodesis plate or a customized peg. Clinical and radiological bone union was achieved in all the operated wrists. At final follow-up of ten patients after 6 years, they had a substantial reduction in pain and improvement in daily function and grip strength compared with those before arthrodesis. We conclude from outcomes of this series that the conversion to arthrodesis after failed wrist arthroplasty is worthwhile and reliably improve wrist function over failed wrist arthroplasty. The results suggest that the patients who will have wrist arthroplasty can be assured that in case of failure the conversion to arthrodesis will produce outcomes comparable with those after primary arthrodesis. LEVEL OF EVIDENCE: IV.

Predictors of outcome after primary flexor tendon repair in zone 1, 2 and 3.

UNLABELLED: We retrospectively reviewed the outcomes of flexor tendon repairs in zones 1, 2 and 3 in 356 fingers in 291 patients between 2005 and 2010. The mean (standard deviation) active ranges of motion of two interphalangeal joints of the fingers were 98° (40) and 114° (45) at 8 weeks postoperatively and at the last follow-up (mean 7 months, range 3-98), respectively. Using the Strickland criteria, 'excellent' or 'good' function was obtained in 95 (30%) out of 322 fingers at 8 weeks and 107 (48%) out of 225 fingers at the last follow-up. A total of 48 (13%) fingers required reoperation because of rupture, adhesion, contracture or other complications. The prevalence of rupture was 4%. We carried out multiple linear regression analysis to identify the predictors of the active digital motion. The following variables were found as negative predictors: age; smoking; injury localization between subzones 1C and 2C; injury to the little finger; the extent of soft tissue damage; concomitant skeletal injury; delay to surgery; use of a 2-strand Kessler repair technique; attempted suture or preservation of the tendon sheath-pulley system; and resecting or leaving the concomitant superficial flexor tendon cuts untreated. Analysing the 8 weeks results of tendon repairs in zones 1 and 2, early active mobilization was found to be superior to Kleinert's regime. LEVEL OF EVIDENCE: III.

Small-to-moderate decreases in cold hypersensitivity up to 3 years after severe hand injuries: A prospective cohort study.

BACKGROUND: The natural course and predictors for decreased cold hypersensitivity were studied in 85 patients with severe hand injuries involving nerve lesions. METHODS: Questionnaires including the McCabe Cold Sensitivity Severity scale (CSS 0-400) were collected after injury, and at 6-month, 12-month, 2-year, and 3-year follow-ups. RESULTS: Between the 12-month and 3-year follow-up, there was a small decrease in cold hypersensitivity as measured by the CSS (median = 24; Q1-Q3 = -11-75; n = 85). Five of the patients recovered from cold hypersensitivity, and ∼ 40% of the patients were less affected by cold hypersensitivity in daily life. Little or no pain early after injury and higher CSS-scores 12 months after primary surgery were weakly associated with the reduced CSS-scores (R(2) = 0.20) at the 3-year follow-up. Six patients had changed work or did not work due to cold hypersensitivity, but the majority of the patients had kept their cold-exposed work. CONCLUSION: Cold-hypersensitive patients may have a reasonable chance for decreased cold sensitivity and cold-associated activity limitations over time, although the majority of the patients will experience persistent problems. Tools to predict improvement remain insufficient.

Evaluation of a home treatment program for cold hypersensitivity using a classical conditioning procedure in patients with hand and arm injuries.

STUDY DESIGN: Case series. INTRODUCTION: A home treatment program using a classical conditioning procedure to decrease cold hypersensitivity has potential to reduce symptoms. PURPOSE: To evaluate a home treatment program for cold hypersensitivity using a classical conditioning procedure in patients who are cold hypersensitive after hand and arm injuries. METHODS: A series of 22 patients followed a classical conditioning procedure consisting of exposing the body to cold outdoor temperatures and immersing the hands in warm water, every other day, for five weeks. The McCabe Cold Sensitivity Severity scale (CSS) was used to measure cold hypersensitivity twice before treatment, at four weeks, and at one year after treatment; Likert scales was used for the patients ratings of improvements. A cold stress test was performed to evaluate rewarming capacity in injured fingers. RESULTS: From the 20 patients, who returned questionnaires at all assessment points, 9 reported a small and three reported a moderate improvement in cold hypersensitivity after treatment. There was a trend toward improvement in the CSS (median 36; interquartile range--19 to 60) and in the rewarming pattern of fingers that were initially slow to rewarm. The improvements were sustained or increased at one-year follow-up. CONCLUSION: These preliminary results suggest that the classical conditioning procedure to treat cold hypersensitivity has potential and should be further explored in a trial with more rigorous design.

Comparison of two uncemented trapezio-metacarpal cups: a finite element study.

Trapezium components from two uncemented total joint replacements were compared in a three-dimensional finite element model. A 100 N axial and angular load was applied in a normal and an osteoporotic bone model. The axial deformation and maximum periprosthetic stress are greater for the Elektra than the Motec CMC cup. The Motec CMC design is less sensitive to changing bone quality. The Elektra cup transmits more stress to the cortical bone rim in all load conditions, but under angular loading the proportionate increase in stress is lower. The Motec CMC design distributes the stress and contact pressure more evenly, whereas the Elektra transfers most of the load to the cortical bone rim and the screw hole base. The design features that are believed to be of greatest significance for the differences are the raised centre of rotation of the Motec CMC cup and the collar acting as a lever arm.

Promising one- to six-year results with the Motec wrist arthroplasty in patients with post-traumatic osteoarthritis.

The Motec cementless modular metal-on-metal ball-and-socket wrist arthroplasty was implanted in 16 wrists with scaphoid nonunion advanced collapse (SNAC; grades 3 or 4) and 14 wrists with scapholunate advanced collapse (SLAC) in 30 patients (20 men) with severe (grades 3 or 4) post-traumatic osteoarthritis of the wrist. The mean age of the patients was 52 years (31 to 71). All prostheses integrated well radiologically. At a mean follow-up of 3.2 years (1.1 to 6.1) no luxation or implant breakage occurred. Two wrists were converted to an arthrodesis for persistent pain. Loosening occurred in one further wrist at five years post-operatively. The remainder demonstrated close bone-implant contact. The clinical results were good, with markedly decreased Disabilities of the Arm Shoulder and Hand (DASH) and pain scores, and increased movement and grip strength. No patient used analgesics and most had returned to work. Good short-term function was achieved using this wrist arthroplasty in a high-demand group of patients with post-traumatic osteoarthritis.

Is revision bone grafting worthwhile after failed surgery for scaphoid nonunion? Minimum 8 year follow-up of 18 patients.

Eighteen patients who underwent revision non-vascularized bone grafting and internal fixation after failed surgery for scaphoid nonunion were reviewed after a minimum of 8.2 years. Eleven of the nonunions were located in the middle and seven in the proximal third of the scaphoid. The mean interval between injury and the revision procedure was 6 years. Sixteen of the 18 nonunions healed, two after a third attempt. Three patients with healed nonunions and one patient with persistent nonunion required salvage procedures for progressive radiocarpal arthrosis. In the remaining 14 cases, the mean loss of wrist flexion/extension arc compared to the contralateral wrist was 36 degrees . Mean reduction of grip strength and key pinch was 9.3 kg and 0.9 kg respectively. The QuickDASH score was 18 and a visual analogue pain score was 21/100 at follow-up. Wrist degeneration increased in all but one case during the observation period. Thirteen of 16 patients with union and one patient with a persisting nonunion experienced moderate symptoms.

Cold hypersensitivity 6 to 10 years after replantation or revascularisation of fingers: consequences for work and leisure activities.

We investigated cold hypersensitivity and activity in 81 adults (male/female 76/5), 6 to 10 years after finger replantation/revascularisation (mean age at injury 43 (SD 15) years). Questionnaires included the McCabe Cold Sensitivity Severity Scale, Potential Work-Exposure Scale and the Disabilities of the Arm, Shoulder and Hand (DASH) score. Eighty per cent of the respondents were cold hypersensitive; 20% were severely or extremely cold hypersensitive. Of the 74 patients employed at injury, 7% had changed work and 4% were not working due to cold hypersensitivity. The median score for cold exposure at work at follow-up was 153 (scale 0-300). The correlation between cold sensitivity and DASH work was low. One-third of the respondents experienced limitations in their leisure activities because of cold complaints. Long-term cold sensitivity was mild or moderate for most patients. Many cold hypersensitive patients managed to continue to work even under cold conditions and cold hypersensitivity was a greater problem in leisure activities.

Improved bone ingrowth and fixation with a thin calcium phosphate coating intended for complete resorption.

Bonit is claimed to be a resorbable electrochemically deposited calcium phosphate coating consisting mainly of brushite, which is a hydroxyapatite precursor. This study involved a comparison of Ti6Al4V screw-shaped implants with and without a 15 +/- 5 microm Bonit coating in rabbit tibia and femur, after 6 and 12 weeks of insertion. The biomechanical removal torque test showed significantly increased values for the coated implants after 12 weeks (p < 0.05) but not after 6 weeks of integration. Higher bone-implant contact was found for the coated implants in the tibia after 6 weeks and for both tibial and femoral screws after 12 weeks (p < 0.05). There was no difference in the inflammatory reaction around the implants, and possible grains of the coating could be detected after 6 weeks, but not after 12 weeks of follow-up. This unloaded short-term study has shown promising results for the easily applicable and resorbable coat (Bonit) compared to uncoated titanium-alloy implants.

Tissue reactions adjacent to well-fixed hydroxyapatite-coated acetabular cups. Histopathology of ten specimens retrieved at reoperation after 0.3 to 5.8 years.

Ten acetabular cups coated with hydroxyapatite (HA) had originally been inserted in five primary and five revision total hip replacements. The thickness of the HA was 155 +/- 35 microm. The cups, which were well-fixed, were retrieved, with their adherent tissue, at reoperation after 0.3 to 5.8 years because of infection (five hips), wear of polyethylene (three hips), and instability (two hips). Undecalcified sections showed a direct contact between bone and osteoid-like tissue which had formed directly onto the HA coating. The area within the threads and their mirror images, as well as the implant-tissue interfaces consisted of similar amounts of bone and soft tissue. Degradation of HA was seen in all hips. The mean thickness of the remaining HA coating was 97 microm (95% CI 94 to 101). The metal interface comprised 66% HA. The HA-tissue interface contained more bone than soft tissue (p = 0.001), whereas the metal-tissue interface included more soft tissue than bone (p = 0.019). Soft tissue at the implant interface and poor replacement of HA by bone may interfere with long-term fixation.

The contribution of coating microstructure to degradation and particle release in hydroxyapatite coated prostheses.

Plasma-sprayed coatings of hydroxyapatite powder are widely used on hip replacements. Commercially, they are supplied by a large number of companies and thus offer different coating design philosophies. This study focuses on a retrieved prosthetic stem that exhibited coating loss on the femoral stem occurring concurrently with third-body wear. The purpose of the research was to establish possible links between the coating microstructure and the clinical findings. A coated stem and cup were sectioned and the cross section was prepared to reveal the coating microstructure. Characterization included X-ray diffraction, FTIR spectroscopy, and crystalline particle quantification within the coating. It was found that the coating has a high amorphous content that provides fast resorption. The amount of crystalline particles increased on the distal location of the stem, the threads of the acetabular shell, and was generally higher on the cup. Accelerated degradation illustrated how the coating may be a particle-generating source by preferential dissolution of the amorphous phase, possibly allowing liberation of crystalline areas and other particulates at the substrate-coating interface. Such particles mainly include the less soluble hydroxyapatide formed from unmelted particles in the plasma or recrystallisation in the coating, but may also include entrapped grit lodged in the substrate during the roughening process. This study accents the importance of coating microstructure in understanding coating resorption.

Vital staining of bone in stable, retrieved femoral surface replacement prostheses: a microscopic study of undecalcified ground sections.

We used vital staining with tetracycline to detect viability of bone at the bone-cement interface in 11 stable ICLH femoral surface replacement prostheses that were retrieved at revision surgery for acetabular loosening. The resected femoral heads were processed for undecalcified ground sections with the prostheses in situ. All sections showed direct bone-to-cement contacts. Bone in direct contact with or close to the cement sometimes showed an abnormal staining, indicating that the bone was not fully mineralized. Areas with fluorescence were observed within all femoral heads but never in direct bone-to-cement contact. From this study, we conclude that the mechanical stability of these cemented femoral surface replacement prostheses depends mainly on the original bone present at the time of primary operation.

Reliability of goniometric measurements and visual estimates of hip ROM in patients with osteoarthrosis.

BACKGROUND AND PURPOSE: Range of motion (ROM) measurements have been included in several hip scores evaluating the results after hip surgery. The clinical procedures of performing these measurements vary and disagreement exists about the accuracy of visual estimatess compared to goniometer measurements. The purpose of this study was to study the reliability of goniometric measurements and visual estimates of hip ROM in patients with osteoarthrosis. METHOD: Hip ROM measurements (abduction, adduction, extension, flexion and internal/external rotation) were recorded by four different teams on the same day and were repeated one week later. Teams 1, 2 and 3 consisted of physiotherapists using standardized goniometric measurements. Team 4 involved an experienced orthopaedic surgeon making the assessments from visual estimates only. Twenty-five patients (6 M, 19 F; mean age 68.5 years, range 46-76 years) with osteoarthrosis of the hip, verified both clinically and radiologically, participated in the study. RESULTS: With the exception of abduction (p = 0.03), there were no significant differences between the measurements recorded on the first and the second occasions for the same teams. The coefficient of variance was 5.5% for flexion (lowest) and 26.1% for extension (highest). Reproducibility was best for flexion. There was also high reliability when all the arcs of motion were summed up (abuction + adduction + extension + flexion + internal/external rotation). With the exception of internal rotation, there were highly significant differences between the teams when two people performed the measurements compared to the values measured by a single individual. Concordance, expressed as the standardized agreement index, between visual estimates made by one individual (the orthopaedic surgeon) and goniometric measurements made by two experienced physiotherapists, were 0.77-0.83 which indicates good agreement. CONCLUSION: The reproducibility of hip ROM measurements was highest for flexion. There was also high reliability when all the six arcs of motion were summed up. Concordance between visual estimates and goniometric measurements indicates good agreement.

Total hip replacement with an entirely hydroxyapatite-coated prosthesis: 5 years' follow-up of 94 consecutive hips.

The first 100 consecutive entirely hydroxyapatite (HA)-coated hip arthroplasties in 86 patients (mean age, 56.2 years [range, 32-73 years]; female-to-male ratio, 75:25) were followed with standardized radiographs annually up to 5 years. All components developed 100% intimate bone-implant contact, being gradually reduced to 99.5%+/-3.8% by 2 partial periacetabular lines and on the femoral side to 94.0%+/-6.1% and 96.5%+/-5.2% in the frontal and lateral planes by lines along 75 stems, mostly in zones 1 and 8. Bone formation took place adjacent to the prostheses regularly, with gap filling and comprehensive periprosthetic bone remodeling, stabilizing at 3 years. No adverse stress shielding was found. The clinical results were excellent without thigh pain. We believe that all components were bonded directly to bone, promoted by the reliable primary fixation and the osteoconductive effect of HA.

Polyethylene wear, osteolysis and acetabular loosening with an HA-coated hip prosthesis. A follow-up of 94 consecutive arthroplasties.

We have followed up for a period of seven to nine years 100 consecutive arthroplasties of the hip in which an entirely HA-coated implant had been used. The clinical results were excellent and bony incorporation was extensive in all components. No stem became loose or subsided but five cups were revised because of loosening after 3.8 to 5.5 years, having functioned painlessly and shown radiological ingrowth. Revision procedures because of excessive polyethylene wear have been performed on 18 hips and are planned for six more. Two eroded metal backings with worn-through polyethylene were exchanged; six hips showed metallosis without polyethylene wear-through. There were two cases of granulomatous cysts in the groin and 66 hips had osteolysis located periarticularly, in the greater trochanter or in the acetabulum.

Surface structure of retrieved ICLH femoral cups.

We characterized the surface structure of 21 retrieved femoral ICLH cups, as an indirect measure of surface damage, with an optical scanner specially developed for surface roughness measurements. 3 unused cups were measured and served as controls. The mean insertion time was 10 (5-15) years. 5 areas on each cup were measured, 1 on the top and 4 at the edge. The mean value of 3 different, commonly used, surface roughness parameters was calculated for the edge measurements. We found no correlation between the surface topography and clinical patient data such as age, body-weight, head-shaft angle, implantation time and wear of the polyethylene socket.