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Chambers SB, Thompson DJ, Schaeffer CV, Graf AR, Wagner E, Gottschalk MB, Seiler JG, Suh N. Determining the Optimal Intramedullary Screw Canal Fill Ratio in Length Unstable Metacarpal Fractures: A Biomechanical Investigation. J Hand Surg Am 2024:S0363-5023(24)00150-3. [PMID: 39007799 DOI: 10.1016/j.jhsa.2024.03.017] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/12/2023] [Revised: 02/24/2024] [Accepted: 03/20/2024] [Indexed: 07/16/2024]
Abstract
PURPOSE Intramedullary (IM) screw fixation is gaining popularity in the treatment of metacarpal fractures. Despite its rapid adoption, there is a paucity of evidence regarding parameters to optimize effectiveness. This study aimed to quantify the relationship between stability, IM screw size, and canal fill using a cadaveric model. METHODS Thirty cadaveric metacarpals (14 index, 13 middle, and three ring fingers; mean age: 58.3 years, range: 48-70) were selected to allow for canal fill ratios of 0.7-1.1 for screws sized 3.0, 3.5, and 4.5 mm. Metacarpals underwent a 45° volar-dorsal osteotomy at the midpoint before fixation with an IM screw. Specimens were subjected to 100 cycles of loading at 10 N, 20 N, and 30 N before load-to-failure testing. Correlation coefficients for angular displacement on the final cycle at each load, peak load to failure, and average stiffness were assessed. RESULTS Correlation coefficients for the angular displacement on the 100th cycle were as follows: 10 N, R = 0.62, 20 N, R = 0.57, and 30N, R = 0.58. Correlation values for peak load to failure as a function of canal fit were as follows: 3.0 mm, R = 0.5, 3.5 mm, R = 0.17, and 4.5 mm, R = 0.44. The canal fill ratio that intersected the line-of-best fit at an angular deformity of 10° was 0.74. Average peak forces for 3.0-, 3.5-, and 4.5-mm screws were 79.5, 136.5, and 179.6 N, respectively. Average stiffness for each caliber was 14.8, 33.4, and 52.3 N/mm. CONCLUSIONS Increasing screw diameter and IM fill resulted in more stable fixation, but marginal gains were seen in ratios >0.9. A minimum fill ratio of 0.74 was sufficient to withstand forces of early active motion with angular deformity <10°. CLINICAL RELEVANCE An understanding of the relationship of IM fill ratio of metacarpal screws to fracture stability may provide a framework for clinicians to optimally size these implants.
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Affiliation(s)
- Spencer B Chambers
- Department of Plastic & Reconstructive Surgery, Roth|McFarlane Hand & Upper Limb Centre, St. Joseph's Hospital, London, Ontario, Canada
| | - Dan J Thompson
- Emory University, Department of Orthopedic Surgery, Atlanta, GA
| | | | | | - Eric Wagner
- Emory University, Department of Orthopedic Surgery, Atlanta, GA
| | | | | | - Nina Suh
- Emory University, Department of Orthopedic Surgery, Atlanta, GA.
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Thomas TL, Kachooei AR, Ilyas AM. Intramedullary K-wires versus Alternate Techniques for Metacarpal Shaft and Neck Fractures: A Systematic Review and Meta-analysis. J Hand Microsurg 2023; 15:376-387. [PMID: 38152671 PMCID: PMC10751204 DOI: 10.1055/s-0042-1749410] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022] Open
Abstract
Intramedullary K-wire (IMKW) fixation is one of the mainstays for surgically treating metacarpal shaft and neck fractures. However, there remains a lack of literature comparing outcomes of the various available surgical repair techniques in all indicated metacarpals. Therefore, we conducted a systematic review and meta-analysis to investigate the clinical advantages and drawbacks of IMKW compared with alternate fracture repair techniques. A comprehensive systematic literature review was performed to identify studies that compared clinical outcomes of IMKW to alternate metacarpal fixation modalities. Outcomes included Disabilities of the Arm, Shoulder, and Hand (DASH/ quick DASH) scores, grip strength, union rate, visual analog scale pain, operative time, and complications. A random-effects model was used to compare IMKW to the pooled effect of other fixation techniques. A total of 10 studies were included in our analysis, comprising 497 metacarpal fractures (220 shafts and 277 necks). IMKW fixation was identified as the control group in all studies. The pooled experimental group included plates, transverse K-wires (TKWs), interfragmentary screws (IFSs), and K-wire cross-pinning (CP). In treating metacarpal shaft fractures, IMKW showed significantly shorter operative time ( p = 0.04; mean difference = - 13; 95% confidence interval = -26 to -0.64). No significant differences were observed in treating metacarpal neck fractures for disability, grip strength, healing rate, pain, operative time, or complication rate. This systematic review and meta-analysis found no difference in clinical outcomes among various surgical techniques for treating metacarpal shaft and neck fractures. Further high evidence studies are required that investigate the efficacy and safety of IFS, CP, TKW, and intramedullary screws versus IMKW for treating closed, unstable metacarpal fractures.
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Affiliation(s)
- Terence L. Thomas
- Department of Orthopaedics, Thomas Jefferson University, Philadelphia, Pennsylvania, United States
| | - Amir R. Kachooei
- Department of Hand and Wrist, Rothman Orthopedic Institute, Philadelphia, Pennsylvania, United States
| | - Asif M. Ilyas
- Department of Hand and Wrist, Rothman Orthopedic Institute, Philadelphia, Pennsylvania, United States
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Graf AR, Ahmed AS, Thompson D, Wagner E, Gottschalk M, Suh N, Seiler JG. Intramedullary Metacarpal Fracture Fixation: A Biomechanical Study of Screw Diameter and Comparison With Intramedullary Wire Stabilization. J Hand Surg Am 2023:S0363-5023(23)00067-9. [PMID: 36914453 DOI: 10.1016/j.jhsa.2023.01.026] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/05/2022] [Revised: 01/02/2023] [Accepted: 01/25/2023] [Indexed: 03/16/2023]
Abstract
PURPOSE Interest in intramedullary metacarpal fracture fixation (IMFF) with screws is increasing. However, the optimal screw diameter for fracture fixation is not yet established. In theory, larger screws should be more stable, but there is concern about long-term sequelae of larger metacarpal head defects and extensor mechanism injury created during insertion as well as implant cost. Therefore, the purpose of this study was to compare different diameter screws for IMFF to a popular and more cost-effective alternative of intramedullary wiring. METHODS Thirty-two cadaveric metacarpals were used in a transverse metacarpal shaft fracture model. Treatment groups consisted of IMFF with 3.0 × 60 mm, 3.5 x 60 mm, and 4.5 x 60 mm screws as well as 4 1.1-mm intramedullary wires. Cyclic cantilever bending was performed with the metacarpals mounted at 45° to simulate physiologic loading. Cyclical loading at 10, 20, and 30 N was performed to determine fracture displacement, stiffness, and ultimate force. RESULTS At 10, 20, and 30 N of cyclical loading, all screw diameters tested provided similar stability as measured by fracture displacement and were superior to the wire group. However, ultimate force under load to failure testing was similar between the 3.5- and 4.5-mm screws and superior to 3.0-mm screws and wires. CONCLUSIONS For IMFF, 3.0, 3.5, and 4.5-mm diameter screws provide adequate stability for early active motion and are superior to wires. When comparing the different screw diameters, 3.5- and 4.5-mm diameter screws offer similar construct stability and strength superior to the 3.0-mm diameter screw. Therefore, to minimize metacarpal head morbidity, smaller screw diameters may be preferable. CLINICAL RELEVANCE This study suggests that IMFF with screws is biomechanically superior to wires in cantilever bending strength in the transverse fracture model. However, smaller screws may be sufficient to permit early active motion while minimizing metacarpal head morbidity.
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Affiliation(s)
- Alexander R Graf
- Emory University, Department of Orthopedic Surgery, Atlanta, GA.
| | - Adil S Ahmed
- Emory University, Department of Orthopedic Surgery, Atlanta, GA
| | - Dan Thompson
- Emory University, Department of Orthopedic Surgery, Atlanta, GA
| | - Eric Wagner
- Emory University, Department of Orthopedic Surgery, Atlanta, GA
| | | | - Nina Suh
- Emory University, Department of Orthopedic Surgery, Atlanta, GA
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Allen ST, Wang OJ, Erickson LO, Ward CM. Incidence of Loss of Reduction After Open Reduction Internal Fixation of Metacarpal Shaft Fractures. Hand (N Y) 2023; 18:61-66. [PMID: 33834894 PMCID: PMC9806539 DOI: 10.1177/15589447211003181] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
BACKGROUND This study compared the incidence of loss of reduction (LOR) between metacarpal fractures fixed with screws alone and those fixed with plates and screws. Secondary aims included identifying patient or fracture characteristics associated with increased risk of LOR. METHODS We retrospectively reviewed 138 metacarpal fractures in 106 patients treated with open reduction internal fixation with screws (60 fractures) or plates and screws (78 fractures) with a mean radiographic follow-up of 50 days for evidence of LOR. We compared the incidence of LOR between the screw and plate groups using a χ2 test. We performed logistic regression analysis to determine whether patient age, sex, metacarpal location (index, long, ring, small), the presence of multiple metacarpal fractures, or fracture pattern were associated with increased incidence of LOR. RESULTS Loss of reduction occurred in 19 (13.8%) of 138 fractures, with no statistically significant difference between lag screw (7 of 60, 11.6%) and plate fixation (12 of 78, 15.4%). Neither fracture pattern nor the presence of multiple metacarpal fractures was associated with an increased incidence of LOR, but patients experienced a 7% increase in the risk of LOR for each additional year of age. Loss of reduction occurred most frequently in index metacarpal fractures (4 of 12, 33%), although this did not reach statistical significance. CONCLUSIONS We found no difference in LOR incidence between lag screw fixation and plate fixation. The overall incidence of LOR was higher in this study than previously reported and increased with increasing patient age.
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Affiliation(s)
| | | | | | - Christina M. Ward
- University of Minnesota, Minneapolis,
USA
- Regions Hospital, Saint Paul, MN,
USA
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Miles MR, Green T, Parks BG, Thakkar MY, Segalman KA, Means KR. Comparison of Lag Versus Nonlag Screw Fixation for Long Oblique Proximal Phalanx Fractures: A Biomechanical Study. J Hand Surg Am 2022; 47:476.e1-476.e6. [PMID: 34247847 DOI: 10.1016/j.jhsa.2021.06.001] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/16/2020] [Revised: 03/31/2021] [Accepted: 06/02/2021] [Indexed: 02/02/2023]
Abstract
PURPOSE To compare lag versus nonlag screw fixation for long oblique proximal phalanx (P1) fractures in a cadaveric model of finger motion via the flexor and extensor tendons. METHODS We simulated long oblique P1 fractures with a 45° oblique cut in the index, middle, and ring fingers of 4 matched pairs of cadaveric hands for a total of 24 simulated fractures. Fractures were stabilized using 1 of 3 techniques: two 1.5-mm fully threaded bicortical screws using a lag technique, two 1.5-mm fully threaded bicortical nonlag screws, or 2 crossed 1.14-mm K-wires as a separate control. The fixation method was randomized for each of the 3 fractures per matched-pair hand, with each fixation being used in each hand and 8 total P1 fractures per fixation group. Hands were mounted to a custom frame where a computer-controlled, motor-driven, linear actuator powered movement of the flexor and extensor tendons. All fingers underwent 2,000 full flexion and extension cycles. Maximum interfragmentary displacement was continuously measured using a differential variable reluctance transducer. Our primary outcome was the difference in the mean P1 fragment displacement between lag and nonlag screw fixation at 2,000 cycles. RESULTS The observed differences in mean displacement between lag and nonlag screw fixation were not statistically significant throughout all time points. A two one-sided test procedure for paired samples confirmed statistical equivalence in the fragment displacement between these fixation methods at all time points, including the primary end point of 2,000 cycles. CONCLUSIONS Nonlag screws provided equivalent biomechanical stability to lag screws for simulated long oblique P1 fractures during cyclic testing in this cadaveric model. CLINICAL RELEVANCE Fixation of long oblique P1 fractures with nonlag screws has the potential to simplify treatment without sacrificing fracture stability during immediate postoperative range of motion.
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Affiliation(s)
- Megan R Miles
- Curtis National Hand Center, MedStar Union Memorial Hospital, Baltimore, MD
| | - Tyler Green
- Curtis National Hand Center, MedStar Union Memorial Hospital, Baltimore, MD
| | - Brent G Parks
- Curtis National Hand Center, MedStar Union Memorial Hospital, Baltimore, MD
| | - Madhuli Y Thakkar
- Curtis National Hand Center, MedStar Union Memorial Hospital, Baltimore, MD
| | - Keith A Segalman
- Curtis National Hand Center, MedStar Union Memorial Hospital, Baltimore, MD
| | - Kenneth R Means
- Curtis National Hand Center, MedStar Union Memorial Hospital, Baltimore, MD.
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Chiu YC, Ho TY, Hsu CE, Ting YN, Tsai MT, Hsu JT. Comparison of the fixation ability between lag screw and bone plate for oblique metacarpal shaft fracture. J Orthop Surg Res 2022; 17:72. [PMID: 35123532 PMCID: PMC8817463 DOI: 10.1186/s13018-022-02963-3] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/30/2021] [Accepted: 01/24/2022] [Indexed: 11/10/2022] Open
Abstract
Abstract
Background
For oblique metacarpal shaft fracture, if anatomical reduction is achieved through conservative cast immobilization rather than stable fixation, bone malrotation can easily occur, resulting in severe loss in hand prehensile function. However, whether bone plate fixation or only lag screw fixation is more preferable remains unclear. Few studies have evaluated whether screw fixation can provide biomechanical fixation strength similar to bone plate fixation.
Objective
We assessed the difference in fixation strength between fixtation with two lag screws and bone plate for oblique metacarpal shaft fractures.
Materials and methods
We created oblique metacarpal shaft fractures on 21 artificial bones and fixated them using (1) double lag screw (2LS group), (2) regular plate (RP group), or (3) locked plate (LP group). To obtain the force–displacement data, a cantilever bending test was conducted for each specimen through a material testing machine. One-way analysis of variance and a Tukey test were conducted to compare the maximum fracture force and stiffness of the three fixation methods.
Results
The maximum fracture force of the 2LS group (mean + SD: 153.6 ± 26.5 N) was significantly lower than that of the RP (211.6 ± 18.5 N) and LP (227.5 ± 10.0 N) groups (p < 0.001). However, no significant differences were discovered between the RP and LP groups. The coefficient of variation for the maximum fracture force of the 2LS group (17.3%) was more than twice as high as that of the RP (8.7%) and LP (4.4%) groups. In addition, the stiffness of the three fixation methods was similar.
Conclusion
Compared with bone plate fixation, double lag screw fixation yielded slightly lower maximum bearable fracture force but similar stiffness. Therefore, this technique could be used for treating oblique metacarpal shaft fractures. However, using double lag screw fixation alone is technically demanding and requires considerable surgical experiences to produce consistent results.
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White MJ, Parr WC, Wang T, Schick BF, Walsh WR. Effect of Bicortical Interfragmentary Screw Size on the Fixation of Metacarpal Shaft Fractures: A 3-Dimensional-Printed Biomechanical Study. JOURNAL OF HAND SURGERY GLOBAL ONLINE 2021; 3:154-159. [PMID: 35415549 PMCID: PMC8991879 DOI: 10.1016/j.jhsg.2021.01.003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2019] [Accepted: 01/27/2021] [Indexed: 11/27/2022] Open
Abstract
Purpose Spiral metacarpal fractures fixed with 2 non-lagged, interfragmentary cortical screws were tested to failure. The effect of screw size (1.2 mm, 1.5 mm, 2.0 mm, and 2.3 mm) on construct strength was tested in 3-point bending. Methods Three-dimensional-printed metacarpal test models were reproduced from computed tomography scans to reduce the confounding variables of bone density and anatomy, often encountered when using cadavers. Results No significant difference was found between the screw sizes, and the peak failure force was similar. Drill bit fracture and deformation during the insertion of the smallest screw (1.2 mm) as well as model failure during the insertion of the largest screw (2.3 mm) were found in some cases. Conclusions Screws of 1.5 mm and 2.0 mm in diameter were of sufficient strength and did not have the issues encountered with smaller or larger screws. Concerns from previous authors regarding intraoperative fracture were consistent with the pre-testing failure of some 2.3-mm models. Clinical Relevance Screws of 1.5 mm or 2 mm appear adequate for the fixation of spiral fracture patterns in metacarpal shafts using bicortical non-lagged technique with a low risk of fixation complications.
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Labèr R, Jann D, Behm P, Ferguson SJ, Frueh FS, Calcagni M. Intramedullary screw fixation for metacarpal shaft fractures: a biomechanical human cadaver study. J Hand Surg Eur Vol 2020; 45:595-600. [PMID: 31948331 DOI: 10.1177/1753193419898066] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
Intramedullary cannulated compression screws have been introduced for the fixation of unstable metacarpal fractures. In the present study, this technique was compared with dorsal compression plating to evaluate its biomechanical performance in stabilizing metacarpal shaft fractures. In a first set of experiments, the biomechanical characteristics of the screws were analysed in an artificial bone model. In subsequent experiments, midshaft osteotomies were performed in human cadaver metacarpals, followed by plating or intramedullary screw osteosynthesis. The metacarpals were tested to failure in cantilever bending, following a stepwise increasing cyclic loading protocol. We found a significantly lower load at failure and a significantly lower number of cycles to failure in the intramedullary screw group, but both methods offered sufficient stability under these loads. With reference to published loads on the metacarpals during use of the hand, we conclude that intramedullary osteosynthesis yields sufficient strength and stiffness for early active motion. A difference in its fixation stability is noted compared with plate fixation, which may not be clinically relevant.
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Affiliation(s)
- Raffael Labèr
- Division of Plastic Surgery and Hand Surgery, University Hospital Zurich, Zurich, Switzerland
| | - David Jann
- Division of Plastic Surgery and Hand Surgery, University Hospital Zurich, Zurich, Switzerland
| | - Pascal Behm
- Institute for Biomechanics, ETH Zurich, Zurich, Switzerland
| | | | - Florian S Frueh
- Division of Plastic Surgery and Hand Surgery, University Hospital Zurich, Zurich, Switzerland
| | - Maurizio Calcagni
- Division of Plastic Surgery and Hand Surgery, University Hospital Zurich, Zurich, Switzerland
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Jones CM, Padegimas EM, Weikert N, Greulich S, Ilyas AM, Siegler S. Headless Screw Fixation of Metacarpal Neck Fractures: A Mechanical Comparative Analysis. Hand (N Y) 2019; 14:187-192. [PMID: 28933187 PMCID: PMC6436118 DOI: 10.1177/1558944717731859] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
BACKGROUND The purpose of this study was to compare the mechanical properties of metacarpal neck fracture fixation by headless compression screw (HCS) with that of Kirschner wire (KW) cross-pinning and locking plate (LP) fixation. METHODS A metacarpal neck fracture was created in 30 fourth-generation composite Sawbones metacarpal models. A volar-based wedge was removed using a custom jig to simulate a typical apex dorsal fracture, unstable in flexion. The models were divided into 3 equal groups based on the method of fixation: retrograde cross-pinning with two 1.2-mm KWs, 2.0-mm dorsal T-plate with six 2.0-mm locking screws (LP), and a 3.0-mm retrograde HCS. Models were fixed at the proximal end, mounted in a material testing machine, and loaded through a cable tensioned over the metacarpal head, simulating grip loading. Cyclic loading from 0 to 40 N was performed, followed by loading to failure. Load, displacement, and failure mode were recorded. RESULTS Stiffness of the HCS (7.3 ± 0.7 N/m) was significantly greater than the KW (5.8 ± 0.5 N/m) but significantly less than the LP (9.5 ± 1.9 N/m). With cyclic loading to 40 N, the LP exhibited significantly less displacement (0.2 ± 1.3 mm) compared with the HCS (2.5 ± 2.3 mm) and KW (2.8 ± 1.0 mm). Load to failure for the HCS (215.5 ±3 9.0 N) was lower than that of the KW (279.7 ± 100.3 N) and of the LP (267.9 ± 44.1 N), but these differences were not statistically significant. CONCLUSIONS The HCS provided mechanical fracture fixation properties comparable with KW fixation. The LP construct allowed significantly less displacement and had the highest strength of the 3 fixation methods.
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Affiliation(s)
| | - Eric M. Padegimas
- Thomas Jefferson University Hospital, Philadelphia, PA, USA,Eric M. Padegimas, Thomas Jefferson University, 1025 Walnut Street, Suite 516, College Building, Philadelphia, PA 19107, USA.
| | | | | | - Asif M. Ilyas
- Thomas Jefferson University Hospital, Philadelphia, PA, USA
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Haughton D, Jordan D, Malahias M, Hindocha S, Khan W. Principles of hand fracture management. Open Orthop J 2012; 6:43-53. [PMID: 22423303 PMCID: PMC3296112 DOI: 10.2174/1874325001206010043] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/04/2011] [Revised: 10/28/2011] [Accepted: 10/29/2011] [Indexed: 01/17/2023] Open
Abstract
The hand is essential in humans for physical manipulation of their surrounding environment. Allowing the ability to grasp, and differentiated from other animals by an opposing thumb, the main functions include both fine and gross motor skills as well as being a key tool for sensing and understanding the immediate surroundings of their owner. Hand fractures are the most common fractures presenting at both accident and emergency and within orthopaedic clinics. Appropriate evaluation at first presentation, as well as during their management, can significantly prevent both morbidity and disability to a patient. These decisions are dependant on a wide range of factors including age, hand dominance, occupation and co-morbidities.A fracture is best described as a soft tissue injury with an associated bony injury. Despite this being the case, this paper intends to deal mainly with the bone injury and aims to discuss both the timing, as well as the methods available, of hand fracture management.
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Affiliation(s)
- Dn Haughton
- Department of Plastic Surgery, Countess of Chester Hospital, Liverpool Road Chester, CH21UL. UK
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