Validity and reliability of a portable handheld dynamometer compared to a fixed isokinetic dynamometer to assess forearm torque strength

To evaluate the effect of treatment on forearm rotation, torque muscle strength can be assessed using an isokinetic device (IKD) or a wrist dynamometer (WD). The aims of this study were 1) to determine concurrent validity and intra- and inter-rater reliability using the WD, and to examine correlations between WD and IKD in different positions; and 2) subsequently, to establish the intermethod reproducibility between WD as a handheld (HHD) or fixed device. We conducted a cross-sectional study in which torque strength was measured in healthy participants by two observers using an IKD and a WD. Study endpoints were concurrent validity (Pearson's r), intra- and inter-rater reliability, intermethod reproducibility (intraclass correlation coefficient: ICC) and measurement error (limits of agreement: LoA). Concurrent validity ranged, in the 2 studies assessing it, from r 0.37 to 0.52 for pronation and from r 0.50 to 0.82 for supination, with wide 95% confidence intervals. ICC for intra-rater reliability for pronation ranged from 0.85 to 0.91 and for supination from 0.91 to 0.95. ICC for inter-rater reliability for pronation ranged from 0.84 to 0.96 and for supination from 0.92 to 0.96. Despite the excellent intra- and inter-rater reliability and intermethod reproducibility for the WD-HHD and fixed WD, validity was low when compared to IKD and wide LoA indicated a high measurement error of approximately 20%. These results suggest that the WD cannot replace the IKD isometric mode for pronation and supination. LEVEL OF EVIDENCE: 2.

Forearm reconstruction by induced-membrane technique after sarcoma resection in children: technique and functional outcome in three cases

Forearm sarcoma is rare in children. Here, we report three cases. One child presented undifferentiated soft-tissue sarcoma involving the ulna, another had Ewing's sarcoma of the ulna, and the third had Ewing's sarcoma of the proximal radius. In the first case, there were episodes of iterative aseptic nonunion, treated surgically. At last follow-up (respectively 11, 9 and 8 years postoperatively), the mean Musculoskeletal Tumor Society (MSTS) score was 80%, 90% and 77% respectively, and all cases were in remission. The induced membrane technique to reconstruct bone defect after sarcoma resection in children is a possible limb-salvage strategy.

Management of complex forearm defects: A multidisciplinary approach

Complex forearm defects with significant damage to, or loss of skin, tendon, muscle, bone and neurovascular structures represent a great challenge for surgeons. The management of such injuries, whether a result of trauma or tumor resection, is focused on preservation of the damaged limb and restoration of hand function. A multidisciplinary approach combining plastic and orthopedic surgical expertise in a coordinated team is proposed to address these challenging cases. The authors have laid emphasis on adequate debridement for wound bed preparation, bone stabilization and reconstruction for a stable bony framework, vascular repair for early revascularization, musculotendinous and nerve reconstruction as well as vascularized tissue coverage on a case-to-case basis to facilitate optimal functional recovery. They also maintain that besides expedient surgical treatment, early mobilization based on an individualized rehabilitation program as well as psychological and socio-professional supports are necessary means of achieving rapid and successful social integration.

Endoscopic fasciotomy for chronic exertional compartment syndrome of the forearm: Clinical results of a new technique using an endoscopic carpal tunnel release device

Exertional compartment syndrome of the forearm is a rare pathology, occurring almost exclusively in motorcycle racers. The results of endoscopic techniques are similar to those of open fasciotomies, but they are less invasive and leave smaller scars. The aim of our study was to present a new endoscopic technique for superficial fasciotomy using the Agee® system and to describe the results. This was a single-center, retrospective descriptive study of 21 patients (36 forearms) operated on between 2006 and 2016. All patients but one were competitive motorcycle racers. The mean operating time was 38.2min (standard deviation (SD), 10.5min). The QuickDASH score was 23.3±10.2% preoperatively versus 1±2% postoperatively (mean±SD). Among the 18 patients who came back for a follow-up visit after 4.9±2.7 years, 17 (94%) were satisfied or very satisfied. The mean time before returning to sport was 4.3 weeks (SD, 1.8 weeks), 9 patients (50%) at the same level as before surgery, 8 (44%) at a higher level, and one at a lower level. There were a few minor complications (superficial vascular lesions, hematoma, transitory hypoesthesia) and symptoms recurred in two patients. Our technique yields outcomes similar to those of other published endoscopic procedures and allows early return to sport. It has the advantage of being based on the Agee endoscope, which is commonly used to treat carpal tunnel syndrome, making the procedure easy to master.

Ultrasound-guided transection of the interosseous membrane of the forearm

We sought to evaluate the feasibility of ultrasound-guided transection of the interosseous membrane of the forearm. The study involved ten forearms from five fresh cadavers. An ultrasound scanner (Toshiba™ Aplio V®, Toshigi, Japan) with a linear probe (Toshiba™ PLT-805AT 8Mhz) and a 25-cm long Kemis® knife (NewClip Technics™, Cholet, France), which was specially created for this study, were used. An approach to the distal and proximal radioulnar joint was made before the transection. The induced muscle hernia sign and the radius joystick test were performed to confirm the effectiveness of the ultrasound-guided transection. Complete dissection of the posterior surface of the forearm was done to check for complications and evaluate the quality of the transection. We registered nine complete transections of the interosseous membrane. The muscular hernia sign was present in all the cases performed. The joystick test was positive in eight cases. One forearm had a vascular complication. This ultrasound-guided interosseous membrane transection technique is feasible and effective with limited vascular and nerve risks. A prospective clinical study is required to validate this anatomical work.

Management of forearm bone loss with induced membrane technique

There are very few published studies describing the treatment of segmental bone defects of the forearm using the induced membrane technique. The objectives of this study were to evaluate the time to bone union, the function of the joints above and below the treated bone segment and the patients' quality of life over the long-term. We performed a retrospective study in all patients treated by the induced membrane for a forearm bone defect over at 13-year period. Demographics, bone union, complications, functional outcomes and occupational status were collected. Six patients were included: 2 posttraumatic injuries, 1 osteomyelitis, 1 septic arthritis, 1 aseptic nonunion, 1 tumor. The average defect length was 64mm (48-110). All defects were treated with internal fixation. Bone graft was harvested from the iliac crest in two patients, the femur (using the Reamer Irrigator Aspirator technique) in three patients and the radius in one patient. Five patients achieved bone union after a mean of 4months (3-6). Three complications were observed: 1 radioulnar instability, 1 infection of the fixation device, 1 abscess. At an average 8½ years' follow-up, the pain level on the VAS was 0.6 (0-3), the Mayo Elbow Performance Score was 98 (90-100), the Herzberg score was 108 (85.6-140) and the QuickDASH was 14.9 (2.7-35). All patients returned to work. Using the induced membrane technique avoids the complications associated with vascularized autograft and yields good functional outcome and quality of life.

Radial osteotomy for the correction of forearm deformities in hereditary multiple osteochondroma

Forearm deformities are often observed in patients with hereditary multiple osteochondroma, resulting in functional disability and cosmetic impairment. The aim of this study was to assess clinical and radiological outcomes after corrective osteotomy of the radius (COR). We performed a retrospective analysis of clinical and radiologic data from patients with forearm deformities who underwent COR combined with osteochondroma resection between 1978 and 2015. Seventeen patients (17 forearms) were included. The mean (range) age at surgery was 11.8 years (3.2-14.4), and the mean interval between surgery and last follow-up was 8.2 years (2-34.2). Range of motion was moderately increased and postoperative radiological assessments found significant improvements in ulnar variance, radial articular angle, bowing of the radius, and carpal slip. At last follow-up, a loss of ulnar variance correction was noted in 11 cases (mean loss: 4mm). The mean score on the Quick Disabilities of the Arm, Shoulder and Hand self-administered questionnaire was 13.9. Our results show that a forearm deformity in a patient with hereditary multiple osteochondroma is an appropriate indication for COR combined with osteochondroma resection and should be performed at the end of growth. This simple, safe technique corrects bowing of the radius and radius-ulna length discrepancy and could limit the risk of radial head dislocation. LEVEL OF EVIDENCE: IV.

Extensor digiti minimi muscular flap: From a clinical case to an anatomical study

We present a case report of a failed posterior interosseous flap with distal pedicle rescued by an extensor digiti minimi (EDM) island pedicle flap supplied by the posterior interosseous artery (PIOA) in reverse flow to cover a soft tissue defect in the hand of a 25-year-old man. We subsequently performed an anatomical study on 5 cadaver limbs to determine the EDM muscle's vascularization: it was segmental, multiple and came from the PIOA. The rotation arc reached the dorsal side of the metacarpophalangeal (MCP) joints, as well as the distal part of the thumb. The indications selected are the same as those of the distal pedicle flap: defect on dorsal side of the hand and MCP joints, coverage of carpal tunnel, failure of posterior interosseous flap. This study describes a new flap and adds to our understanding of the EDM muscle's vascularization.

Forearm lengthening and prosthetic management in children with transverse congenital forearm deficiency

In cases of transverse congenital forearm deficiency, achieving a good prosthesis fit during childhood remains a challenge. Ulnar lengthening is a treatment option for improving the prosthesis fit. The objective of this study was to evaluate surgical ulnar lengthening and the subsequent prosthesis fit. We reviewed four cases of ulnar lengthening in children with transverse congenital forearm deficiency. The procedure was evaluated in terms of the duration of lengthening, increase in ulnar length and healing index. The elbow range of motion, functional outcome (Prosthetic Upper Extremity Functional Index, PUFI) and time spent using the prosthesis per day were evaluated. The mean age at the time of the lengthening procedure was 3.5 years, the mean duration of lengthening was 58.3 days, the mean length gain was 21 mm, and the mean healing index was 70.1 days/cm. Elbow range of motion was restricted in one patient (100°-140°) and full in the other three patients. Based on the PUFI, 88.4% of activities were performed without the prosthesis. Children only used their prosthesis to perform specific tasks. Given the high complication rate and the lack of prosthesis use during daily activities, the main indication for forearm lengthening is a very short forearm that prevents prosthesis fitting. This procedure should be performed later in life - in adolescence.

A combined variation of Palmaris longus and Flexor digitorum superficialis: Case report and review of literature

The muscles of the anterior compartment of the forearm often exhibit anatomic variations. During dissection of the upper right limb of a preserved cadaver, morphological variations in the Palmaris longus and Flexor digitorum superficialis muscles were found. The Palmaris longus muscular fibers converged to a tendon that passed beneath the Flexor retinaculum, and inserted at the base of the middle phalanx of the fourth digit, replacing the tendon of Flexor digitorum superficialis. The Flexor digitorum superficialis was divided into two muscular heads: a digastric medial head giving tendons to the second and fifth digits, and a lateral head giving one tendon to the third digit. All these tendons were inserted in the respective digits by two bundles between which were located the tendon of the Flexor digitorum profundus muscle. Variations of flexor muscles must be documented because of their clinical significance and their potential use of these muscles in orthopaedic and reconstructive surgery.

A manifestation of cutaneous aspergillosis in immunocompetent host: A rare presentation as forearm mass lesion

The Aspergillus species is a ubiquitous fungus, which can cause pathogenic and opportunistic fungal infections in the immunocompromised. This is an atypical occurrence in the host with an otherwise normal immune status. We report a case of an immunocompetent 45-year-old patient who developed cutaneous aspergillosis with a very benign course presenting simply with a gradually enlarging mass and none of the classical signs and symptoms. All prior laboratory examinations failed to detect or reproduce the organism or establish a diagnosis. Surgery was both diagnostic and therapeutic, to remove the mass which causes the patient pain and limitation of activity. This was to our advantage because the fungal elements were very well encapsulated and the mass was a well-organized conglomeration of cystic abscesses that even prolonged chemotherapy alone might not succeed in eradicating the infection.

Dislocation of the elbow with ipsilateral forearm fracture. Six particular cases

Elbow dislocation associated with ipsilateral radial shaft fracture is an infrequent injury (nine cases reported in the literature). We present six new cases observed between 2006 and 2012, with an average age of 31 years and a mean follow-up of 18 months. The forearm fracture and ipsilateral dislocation of the elbow were probably caused by forearm hypersupination with extension of the elbow. The dislocation was reduced by manipulation before open reduction and osteosynthesis of the forearm fracture. Four elbows were stable after reduction; two markedly unstable elbows necessitated temporary humero-ulnar external fixation; one case needed a ligamentoplasty several months later. Despite the complexity of the traumatic lesion, the clinical and radiological outcomes were acceptable.

Primary giant congenital infantile fibrosarcoma of the left forearm

Infantile fibrosarcoma is a rare soft tissue tumor in the infant, and only a few cases have been reported as congenital. We report a case of congenital infantile fibrosarcoma of the left forearm at birth. An amputation was performed because the tumor was relapsed soon after surgical removal, and associated with anabrosis and bleeding.