Proximal Interphalangeal Research Articles

Stabilization of the hypoplastic thumb type Blauth IIIB using a non-vascularized proximal interphalangeal joint from the toe as an alternative reconstruction when pollicization is not accepted: Description of the surgical technique

Stabilization of the hypoplastic thumb type Blauth IIIB using a non-vascularized proximal interphalangeal joint from the toe as an alternative reconstruction when pollicization is not accepted: Description of the surgical technique

Motion Analysis of the Wrist and Finger Joints in Sport Climbing.

Climbing is a fast-growing sport, with one of the most common injuries being a rupture of the finger flexor tendon pulley. The strain on pulleys increases as finger joints flex. However, to our knowledge, no study has conducted a kinematic analysis of climbers' fingers. Thus, this study aimed to examine finger kinematics during typical climbing tasks. Eleven elite climbers performed a sequence of four climbing moves, which were recorded by an optical motion capture system. Participants used crimp, half-crimp, and open-hand grips for three trials each, with the fourth condition involving campusing using any grip except crimp. Mean proximal interphalangeal joint (PIP) flexion during the holding phase was 87° (SD 12°), 70° (14°) and 39° (27°) for the crimp, half-crimp and open-hand grip, respectively. Hence, inter-individual PIP flexion ranges overlap between different gripping conditions. Two different movement patterns emerged in the open-hand grip, possibly influenced by the use of the little finger, leading to varying degrees of flexion in the middle and ring fingers. Avoiding little finger usage in the open-hand grip may reduce load during pulley rupture rehabilitation. The implications of PIP joint angle variability on individual pulley injury risk or prevention warrant further investigation. Motion capture proved effective for understanding finger kinematics during climbing and could guide future studies on pulley injury risk factors.

Imaging methods in monitoring gout - a pictorial essay.

We present a pictorial essay based on the case of a 52-year-old man suffering from chronic gout, who was followed up for seven years. During this period of time, radiographs, ultrasonography, and dualenergy computed tomography were performed several times, revealing severe progression of gout. This was most likely due to the lack of patient compliance. Inflammatory and destructive lesions were observed in the wrists, in the metacarpophalangeal and proximal interphalangeal joints. Ultrasonography showed tenosynovitis, synovitis with small calcifications in the synovial membrane. Radiographs obtained in later stages showed tophi and bone erosions. Dual-energy computed tomography showed deposits of monosodium urate crystals in different locations, which increased in volume over time. This modality can be used to confirm a clinical diagnosis of gout, especially in early stages of the disease, and to follow up the treatment.

Ensemble detection of hand joint ankylosis and subluxation in radiographic images using deep neural networks

The modified total Sharp score (mTSS) is often used as an evaluation index for joint destruction caused by rheumatoid arthritis. In this study, special findings (ankylosis, subluxation, and dislocation) are detected to estimate the efficacy of mTSS by using deep neural networks (DNNs). The proposed method detects and classifies finger joint regions using an ensemble mechanism. This integrates multiple DNN detection models, specifically single shot multibox detectors, using different training data for each special finding. For the learning phase, we prepared a total of 260 hand X-ray images, in which proximal interphalangeal (PIP) and metacarpophalangeal (MP) joints were annotated with mTSS by skilled rheumatologists and radiologists. We evaluated our model using five-fold cross-validation. The proposed model produced a higher detection accuracy, recall, precision, specificity, F-value, and intersection over union than individual detection models for both ankylosis and subluxation detection, with a detection rate above 99.8% for the MP and PIP joint regions. Our future research will aim at the development of an automatic diagnosis system that uses the proposed mTSS model to estimate the erosion and joint space narrowing score.

A prospective study of functional outcome of treatment of intra-articular fracture of proximal interphalangeal joint by static traction and early mobilization in adults

Abstract Background: Failure to appropriately address intra-articular fractures of the proximal interphalangeal (PIP) joint may result in enduring pain, stiffness, and post-traumatic arthritis. Our approach employs a straightforward and economical method of creating a static traction splint using an aluminum splint. This splint is removed after 2 weeks, followed by the initiation of early mobilization. Materials and Methods: A flexible aluminum splint is placed on the injured finger. A polypropylene suture passes through the nail and is tied to the splint for sustained traction, and the finger is immobilized for 2 weeks. After this period, the splint is removed, and active assisted finger mobilization begins. Patients are assessed post-surgery using the Ishida score. Results: This study involved 30 treated patients, with a mean age of 31.47 ± 11.11 years, ranging from 18 to 69 years. Among them, 26 were male and 4 were female, with 20 experiencing right-side involvement. Sports-related injuries were reported in 17 cases, followed by road traffic accidents in 7 cases and slips in 6 cases. The mean range of motion, measured in degrees, was 83.3 ± 0.22. Overall, the patients achieved excellent results. Conclusion: Utilizing static traction for intra-articular PIP joint fractures is a safe, relatively straightforward, and cost-effective method with minimal complications. This approach guarantees anatomical joint alignment, promotes favorable fracture healing, and facilitates early mobilization, leading to a swift and satisfactory recovery.

Industry Sponsorship Bias in Collagenase Clinical Trials for Dupuytren Disease: A Meta-analysis.

Collagenase clostridium histolyticum (collagenase) was introduced in 2010 creating a nonoperative treatment option for Dupuytren disease with promising results in sponsored clinical trials. A meta-analysis was performed to investigate industry sponsorship bias. A systematic review of collagenase treatment of Dupuytren contracture was conducted. Articles containing mesh terms including "microbial collagenase" and "Dupuytren's contracture" were searched and limited to only clinical trials with similar protocols for inclusion. Meta-analysis of treatment endpoints of correction of contracture to 0-5 degrees after first and last injection was conducted comparing sponsored versus nonsponsored studies. Sixteen of the 29 identified articles met criteria for inclusion. Nonsponsored studies reported a significantly higher rate of meeting the primary treatment endpoint compared to sponsored studies after single injection for all joints (69.6% vs 56% P < 0.01), metacarpophalangeal joint (96% vs 64% P < 0.01), and proximal interphalangeal joint (67% vs 36% P = 0.011). The correction in contracture rates was similar between groups with studies evaluating more than one injection. Nonsponsored studies published higher success rates in meeting the primary endpoint of full correction after single injection than sponsored studies; however, similar results with multiple injections. This study demonstrated that sponsored studies of collagenase produced highly powered studies that may be reliably depended on for evidence-based clinical application.

A Case of a Pediatric Finger Tendon Rupture Diagnosed by Point-of-Care Ultrasound

BackgroundPediatric tendon injuries to the finger are rare, and their diagnosis can be challenging due to the difficulty in sensorimotor assessment in pediatric patients. Point-of-care ultrasound (POCUS) has currently been used for identifying tendon injury in adult acute care, but reports of its use in pediatric emergency departments are scarce. Case reportA previously healthy 14-year-old male patient visited our emergency department due to a finger laceration that occurred when he was cutting sausages using a knife. Physical examination revealed a 1.5 cm laceration over the palmer surface of the left fifth proximal phalanx. Tendon exposure was unremarkable, and the peripheral perfusion and sensation of the injured finger were intact. Flexion of the proximal and distal interphalangeal joints was limited due to pain. POCUS showed the disruption of the tendon structure over the laceration site, suggesting the flexor tendon rupture. Wound exploration by the orthopedic team revealed a transected flexor digitorum superficialis and flexor digitorum profundus and a tendon repair was performed. The patient was discharged with immobilization of the injured hand. Why Should an Emergency Physician Be Aware of This?Pediatric tendon injuries to the finger are rare, and their diagnosis can be challenging to diagnose due to the difficulty in sensorimotor assessment in pediatric patients. POCUS can directly visualize a tendon structure without procedural sedation or radiation exposure, empowering physicians to diagnose tendon injuries and optimize patient care.

EROSIVE OSTEOARTHRITIS: A RARE CASE REPORT

Osteoarthritis, also known as OA, is a type of joint degeneration characterized by changes in the morphology and biochemistry of the synovial membrane and joint capsule, as well as degradation of cartilage joint and expansion of the marginal bone. Inflammation causes the joints to deteriorate in a subtype of osteoarthritis called erosive OA. DIP (distal interphalangeal), PIP (proximal interphalangeal), CMC (carpometacarpal) and metacarpophalangeal (MCP) joints are the most often affected joints in the hand. Other joints in other body regions are extremely seldom affected. Our patient’s diagnosis report suggests erosive osteoarthritis and seronegative arthritis as negative anti-RF factors.

Anatomy of the Lumbrical Muscles: Implications for Mechanical Advantage.

The lumbrical muscles comprise 4 intrinsic muscles of the hand and are involved in flexion of the metacarpophalangeal joint (MCPJ) and extension of the proximal interphalangeal and distal interphalangeal joints. The purpose of this study was to investigate the anatomical mechanics of the lumbrical muscles of the index, middle, ring, and small fingers. We evaluated 25 cadaver arms and measured the distance between the MCPJ and fingertip, the distance between the MCPJ and lumbrical muscle insertion, and the distance between the MCPJ and the most proximal lumbrical muscle origin. With these measurements we calculated the needed force, insertion ratio (length of the proximal, middle, and distal phalanx divided by the MCPJ to insertion distance), and lumbrical muscle length. We found that the force was significantly different between all fingers, except for the comparison of the index and ring finger (P = .34). In addition, we found that muscle length was significantly different between most the fingers, except for the comparison between the index and middle fingers (P = .24), and index and ring fingers (P = .20). There was no significant difference in insertion ratio. Our study suggests that the anatomical mechanics for the motor function of the lumbrical muscles are similar in all fingers. This could further imply that movements are equally precise in all fingers resulting in coordination with one another and, therefore, adequate hand function. IV.

Refinement of Surgery for Postaxial Polysyndactyly of the Toes: Esthetic Outcome in Japanese Feet.

Treatment for polysyndactyly of the toes aims at cosmetic improvement but the lateroplantar rotation of the new fifth toe remains challenging. This study evaluated our novel surgical procedure for postaxial polysyndactyly of the toes. Patients with postaxial polysyndactyly involving the fourth, fifth, and sixth toes treated in 2007 to 2017 with a minimum follow-up duration of 1 year were retrospectively investigated. Our aims of surgery for this condition were to avoid excessive lateroplantar rotation of the new fifth toe by using a proximally elongated plantar "shark-fin flap" and to make the tip of this toe appear to be naturally pointing inward by using the dog-ear component of the flap on the tip of the toe. The excess skin of the shark-fin flap was grafted onto the lateral surface of the fourth toe. Lateroplantar rotation of the fifth toe in these patients was compared with that in photographs of the feet of 96 normal 4-year-old children. A total of 11 feet in 10 patients (6 male, 4 female; mean age 1.3 years) were analyzed. Syndactyly between the fourth and fifth toes was complete in 3 feet, incomplete at the level of the distal interphalangeal joint of the fifth toe in 5, and incomplete at the level of the proximal interphalangeal joint of the fifth toe in 3. Lateroplantar rotation of the fifth toe, evaluated by the mean angle between 2 intersecting lines extending from the proximal nail fold of the third and fifth toes, was 25 ± 10° in normal feet and 0 ± 12° in operated feet with polysyndactyly. The absolute left-right difference in this angle was 7 ± 5° in normal children and 22 ± 12° in patients with polysyndactyly. Valgus deformity of the new fifth toe improved in all patients during a mean postoperative follow-up of 3.8 years. Using our procedure, no excessive lateroplantar rotation has been observed when the tip of the fifth toe is inclined inward using a dog-ear flap component. This procedure could be useful in patients in whom the cosmetic outcome is a priority.

Surgical treatment of trigger finger: a comparative study of A1 pulley opening versus ulnar superficialis slip resection

Trigger finger is a common condition. Surgery most frequently involves opening the A0 and A1 pulleys. However, this shows limited effectiveness in correcting proximal interphalangeal joint fixed flexion deformity. The present study aimed to compare clinical outcomes between two surgical techniques for trigger finger treatment.This retrospective study included 127 patients, 72 of whom underwent resection of the ulnar slip of the flexor superficialis, and 55 underwent opening of the pulleys. Study data comprised patient characteristics, range of motion, proximal interphalangeal fixed flexion deformity measurement, Quick-DASH and PRWE scores, and overall satisfaction.There were no significant differences between the two groups in terms of Quick-DASH or PRWE scores. Fixed flexion deformity correction was slightly but not significantly better with resection of the ulnar slip of the flexor superficialis (100%) compared to opening of the pulleys (88%). Level of evidence: Level IV.

A Rare Case of Multicentric Reticulohistiocytosis in An Elderly Male Patient

Multicentric reticulohistiocytosis (MRH) is a rare systemic proliferative granulomatous disease of non-Langerhans cells. The aim of this study is to report a case of multicentric reticulohistiocytosis that is easily misdiagnosed in clinical practice. A 74-year-old man sought the Rheumatology office in December 2022 with a main complaint of arthralgia for six months, associated with morning stiffness, joint swelling, and upper and lower limb weakness. On physical examination, papules on the dorsal surface of the proximal interphalangeal joints, base of the nose, and lateral surface of the right hallux were observed. Hyperemia was also identified on the back, and edema of the proximal and distal interphalangeal joints, wrists and knees. Laboratory tests revealed ESR and ANA within normal limits. Tests were negative for Anti-Sm, Anti-RO, rheumatoid factor, Anti-CCP, HIV, and HCV. Chest CT-scan showed right axillary lymph node enlargement, measuring 2.7 cm, atheromatous aorta, and streaks with scattered atelectasis in the lower lobe, without other changes. On total abdominal ultrasound, prostate enlargement was detected. Immunohistochemistry of skin biopsy identified atypical acinar proliferation. Histopathology skin biopsy stained with hematoxylin-eosin (January 2023) showed a dense histiocytic infiltrate. Detail of the histiocytic component displayed “ground glass” eosinophilic cytoplasm. Immunohistochemistry was negative for S100 and CD34 and positive for CD68. Final diagnosis was MRH. The patient underwent treatment with drugs. In conclusion, clinical manifestations, including skin and joint changes, with signs and symptoms of rheumatic disorders (e.g. dermatomyositis and rheumatoid arthritis) similar to those of MRH are expected in rheumatology practice. However, knowledge about disease progression in MRH is limited. Therefore, this case report is described due to its rarity Keywords: Non-Langerhans-Cell Histiocytosis, Pathology, Muticentric Reticulohistiocytosis, Rheumatological Diseases,

Immediate effects of a novel hand rehabilitation board on fine motor skills in children with cerebral palsy: A pilot study.

In children with cerebral palsy (CP), fine motor skills limit forearm supination and active extension of the elbow, wrist, or fingers. Therapeutic interventions focusing on improving the ranges at these joints while facilitating active movements are the key to augmenting fine motor skills. This pilot study examines if children with CP (with UE involvement) exposed to the Novel Hand Rehabilitation (NHR) Board will demonstrate 1) changes in spasticity and passive ROM of forearm and wrist/finger muscles, and 2) improvement in fine motor abilities. The forearm and wrist/fingers of children with spastic CP (N = 15; M = 7, F = 8) aged 49-72 months (65.33±6.355 months) were positioned on the NHR board till their tolerance limit or a minimum duration of 30 minutes. The outcome measures, i.e., spasticity (Modified Ashworth Scale), passive range of motion (PROM) of wrist and fingers, and fine motor skills (PDMS-2 - Fine motor scale), were recorded. The spasticity of forearm pronators (0.001) and wrist flexors (0.008) reduced significantly, but not in wrist extensors. Post-intervention improvements in wrist extension (p = 0.005) and ulnar deviation ROM (p = 0.007) were significant. In thumb, changes were non-significant for the CMC flexion, but extension (0.003) and abduction (0.001) as well as MCP extension (0.004) were significant. The post-intervention MCP extension ROM for the 2nd (0.001), 3rd (0.007), and 4th fingers (0.014) were also substantial, but not for PIP and DIP joints. The post-intervention percentage change in the Grasping and Visual-motor integration subtests of PDMS-2 was 11.03% (p = 0.002) and 5.09% (p = 0.001) respectively. The immediate effects on fine motor skills in children with CP after the NHR board application were positive and encouraging. Hence, the NHR board can be recommended as an intervention to improve the fine motor abilities of children with CP.

Pediatric Postburn Flexion Contracture Release: Early Outcomes Using 2 Bloodless Techniques.

Postburn flexion contracture of the hand in children constitutes a significant proportion of postburn complications. We compared the early clinical outcomes of reconstruction of pediatric postburn flexion contracture of the digits of the hand using tourniquet or tumescent technique. A prospective randomized study of pediatric patients requiring contracture release and wound resurfacing with full-thickness skin graft between September 2020 and August 2021. Patients were randomized into groups of either tourniquet or tumescent technique for contracture release. The surface area of graft take and total active motion across joints were the outcome measures. Student t test and chi-square test were performed. Twenty-two patients were randomized into either group. The mean age of the participants was 6.09 ± 2.41 years, mostly males 31 (72.1%). A grade 3 flexion contracture was the most common (72.1%). Ninety-four digits and 178 joints were operated on, with the proximal interphalangeal joint being the most common (48.9%). The mean surface area of graft take on postoperative day 10 was significantly higher for the tumescent group than the tourniquet group, P = .001. The total active motion across the joints at 6 and 9 weeks postoperative showed a strong correlation between the total active motion across joints and the technique of release, P = .004 and .001, respectively. Tumescent technique is a feasible alternative to the tourniquet method for postburn flexion contracture release of the digits in the pediatric burned hand.

Dupuytren's Disease: A Novel Minimally Invasive Pull-Through Technique.

Background Dupuytren's disease decreases quality of life significantly and often requires surgical treatment, nevertheless there is no actual gold standard. The aim of this study was to introduce the use of minimally invasive pull-through technique. Methods From 2016 to 2020, 52 patients suffering from Dupuytren's contracture were treated with the minimally invasive pull-through technique. We evaluated the improvement in range of motion, pain, disability, and quality of life in the long term. Total extension deficit, quick disabilities of the arm, shoulder, and hand (QuickDASH), and EuroQol five dimensions-five levels index were systematically scored before each surgical intervention and reevaluated after 24 months. Results Fourteen patients (26.9%) had already received a previous intervention (percutaneous needle aponeurotomy or collagenase Clostridium histolyticum ). The mean preoperative total active extension deficit was 84.0 ± 23.3 degrees (55-130 degrees). Mean follow-up was 36 months. There were no cases of tendon rupture or neurovascular injury. Total active extension deficit at the final follow-up was 3.4 ± 2.3 degrees (0-12 degrees). The mean active range of motion of the MCP and PIP joints were, respectively, 90.5 ± 3.3 degrees (85-96 degrees) and 82.7 ± 2.5 degrees (80-87 degrees). At 24 months after cord excision, a mean 10.7 points improvement in the QuickDASH questionnaire was registered ( p < 0.001). Pull-through technique was equally effective both on patients with a primary or a recurrent disease. Eight patients (15.4%) had a recurrence of disease in the metacarpophalangeal joint or proximal interphalangeal joint. Conclusion The pull-through technique is a simple, accessible, and effective technique for the treatment of Dupuytren's contracture. The use of palmar mini-incisions combined with minimal dissection has a low risk of iatrogenic injury to the neurovascular bundles and tendons, and has a low risk of recurrence rate. This study reflects level of evidence IV.

Artificial intelligence model for segmentation and severity scoring of osteophytes in hand osteoarthritis on ultrasound images.

To develop an artificial intelligence (AI) model able to perform both segmentation of hand joint ultrasound images for osteophytes, bone, and synovium and perform osteophyte severity scoring following the EULAR-OMERACT grading system (EOGS) for hand osteoarthritis (OA). One hundred sixty patients with pain or reduced function of the hands were included. Ultrasound images of the metacarpophalangeal (MCP), proximal interphalangeal (PIP), distal interphalangeal (DIP), and first carpometacarpal (CMC1) joints were then manually segmented for bone, synovium and osteophytes and scored from 0 to 3 according to the EOGS for OA. Data was divided into a training, validation, and test set. The AI model was trained on the training data to perform bone, synovium, and osteophyte identification on the images. Based on the manually performed image segmentation, an AI was trained to classify the severity of osteophytes according to EOGS from 0 to 3. Percent Exact Agreement (PEA) and Percent Close Agreement (PCA) were assessed on individual joints and overall. PCA allows a difference of one EOGS grade between doctor assessment and AI. A total of 4615 ultrasound images were used for AI development and testing. The developed AI model scored on the test set for the MCP joints a PEA of 76% and PCA of 97%; for PIP, a PEA of 70% and PCA of 97%; for DIP, a PEA of 59% and PCA of 94%, and CMC a PEA of 50% and PCA of 82%. Combining all joints, we found a PEA between AI and doctor assessments of 68% and a PCA of 95%. The developed AI model can perform joint ultrasound image segmentation and severity scoring of osteophytes, according to the EOGS. As proof of concept, this first version of the AI model is successful, as the agreement performance is slightly higher than previously found agreements between experts when assessing osteophytes on hand OA ultrasound images. The segmentation of the image makes the AI explainable to the doctor, who can immediately see why the AI applies a given score. Future validation in hand OA cohorts is necessary though.

A Comparison of Patient Characteristics and Outcomes Between Patients Receiving Flexor Digitorum Superficialis Slip Excision or Isolated A1 Pulley Release for Trigger Finger

Resection of the radial or ulnar slip of the flexor digitorum superficialis (FDS) tendon is a known treatment option for persistent trigger finger. Risk factors for undergoing FDS slip excision are unclear. We hypothesized that patients who underwent A1 pulley release with FDS slip excision secondary to persistent triggering would have a higher comorbidity burden compared to those receiving A1 pulley release alone. We identified all adult patients who underwent A1 pulley release with FDS slip excision because of persistent triggering either intraoperatively or postoperatively from 2018 to 2023. We selected a 3:1 age- and sex-matched control group who underwent isolated A1 pulley release. Charts were retrospectively reviewed for demographics, selected comorbidities, trigger finger history, and postoperative course. We performed multivariable logistic regression to assess the probability of FDS slip excision after adjusting for several variables that were significant in bivariate comparisons. We identified 48 patients who underwent A1 pulley release with FDS slip excision and 144 controls. Our multivariable model showed that patients with additional trigger fingers and a preoperative proximal interphalangeal (PIP) joint contracture were significantly more likely to undergo FDS slip excision. Patients who underwent A1 pulley release with FDS slip excision were significantly more likely to have multiple trigger fingers or a preoperative PIP joint contracture. Clinicians should counsel patients with these risk factors regarding the potential for FDS slip excision in addition to A1 pulley release to alleviate triggering of the affected digit. Therapeutic III.

Anatomically-Inspired Robotic Finger with SMA Tendon Actuation for Enhanced Biomimetic Functionality.

This research introduces an advanced robotic finger designed for future generalist robots, closely mimicking the natural structure of the human finger. The incorporation of rarely discussed anatomical structures, including tendon sheath, ligaments, and palmar plates, combined with the usage of anatomically proven 3D models of the finger, give rise to the highly accurate replication of human-like soft mechanical fingers. Benefiting from the accurate anatomy of muscle insertions with the utilization of Shape Memory Alloy (SMA) wires' muscle-like actuation properties, the bonding in-between the flexor tendons and extensor tendons allows for the realization of the central and lateral band of the finger anatomy. Evaluated using the computer vision method, the proposed robotic finger demonstrates a range of motion (ROM) equivalent to 113%, 87% and 88% of the human dynamic ROM for the DIP, PIP and MCP joints, respectively. The proposed finger possesses a soft nature when relaxed and becomes firm when activated, pioneering a new approach in biomimetic robot design and offering a unique contribution to the future of generalist humanoid robots.

Modification of the Zancolli Lasso Procedure for Simultaneous Correction of Wartenberg's Sign.

Ulnar nerve injury initiates an imbalance between the intrinsic muscles and extrinsic extensors of the ring and small fingers, which leads to the characteristic hyperextension of the metacarpophalangeal (MP) joints and flexion of the proximal interphalangeal joints of these 2 digits-commonly referred to as the ulnar claw hand. In addition to these changes in the static posture of the hand, ulnar nerve palsy severely impairs grasp due to deficient active MP joint flexion. In most cases, motor balance can be restored by preventing MP joint hyperextension and augmenting MP joint flexion using the Zancolli lasso procedure (ZLP). Ulnar neuropathy can cause a second motor imbalance between the ulnar intrinsics and the extensor digit minimi leading to an abduction deformity of the small finger known as Wartenberg's sign. The inability to adduct the small finger can be a great source of frustration to patients. Using a cadaveric biomechanical model, we have developed a simple modification of the Zancolli lasso procedure that simultaneously corrects claw deformity and Wartenberg's sign and we report its efficacy in 2 clinical cases.

The use of resurfacing implants (CapFlex-PIP) for fingers proximal interphalangeal joint osteoarthritis: satisfactory clinical and radiological results at 5-year follow-up

The use of resurfacing implants (CapFlex-PIP) for fingers proximal interphalangeal joint osteoarthritis: satisfactory clinical and radiological results at 5-year follow-up