Introduction: We investigated the use of suture repair for tuberosities in hemiarthroplasty for 4 part fractures, by examining cadaveric repairs after repetitive loading tests. Sutures are the most popular repair tool currently. However tuberosity “disappearance” with this is common; and touted as the prime cause for failure. In some studies biochemical lysis has been suggested to explain this. The aim of this study was to analyse the mode of failure. Materials and Methods: Tests were carried out in line with UK HTA regulations. Eight fresh frozen cadaver shoulders were stripped of all soft tissue except the rotator cuff. A 4 part fracture was then created by osteotomising the tuberosities. A standard hemiarthroplasty implant was cemented in at the native height and retroversion. A tuberosity repair with Ethibond 5 sutures, employed transverse cerclage sutures; and vertical figure of eight repairs, from the cuff to a shaft drill hole. The repairs were subjected to cyclical tension on the cuff musculature, and simultaneous gleno-humeral motion; using a test process we have described separately. During the entire process the repair site was videoed. At the end of 8000 cycles the tuberosities were probed with a forceps, to record any movement in vertical, horizontal and axial planes. The humeral shaft was also rotated to check for dissociation between tuberosities and shaft. Results: Uniform failure of the hold on the tuberosities occurred by 8000 cycles. Defining failure as movement of any tuberosity more than 3mm, failure rate was 100% (exact 95% confidence interval 65.2 – 100% due to sample size). Movements of at least 1cm were commonly observed. The sutures were loose but never snapped. Failure mechanisms involved digging of the sutures into the tendon, cutting of the sutures through bone, loss of cancellous supporting structure, and migration of the sutures. Failure occurred early in what we considered to the parallel of 1 to 2 weeks of rehabilitation. Conclusion: Suture repair of tuberosities has a high chance of failure if the cuff can not be prevented from contracting. We believe failure is early and mechanical, rather than by lysis or biochemical means. More effective alternatives to suture techniques would be desirable

Aims. Olecranon fractures are usually caused by falling directly on to the olecranon or following a fall on to an outstretched arm. Displaced fractures of the olecranon with a stable ulnohumeral joint are commonly managed by open reduction and internal fixation. The current predominant method of management of simple displaced fractures with ulnohumeral stability (Mayo grade IIA) in the UK and internationally is a low-cost technique using tension band wiring. Suture or suture anchor techniques have been described with the aim of reducing the hardware related complications and reoperation. An all-suture technique has been developed to fix the fracture using strong synthetic sutures alone. The aim of this trial is to investigate the clinical and cost-effectiveness of tension suture repair versus traditional tension band wiring for the surgical fixation of Mayo grade IIA fractures of the olecranon. Methods. SOFFT is a multicentre, pragmatic, two-arm parallel-group, non-inferiority, randomized controlled trial. Participants will be assigned 1:1 to receive either tension suture fixation or tension band wiring. 280 adult participants will be recruited. The primary outcome will be the Disabilities of the Arm, Shoulder and Hand (DASH) score at four months post-randomization. Secondary outcome measures include DASH (at 12, 18, and 24 months), pain, Net Promotor Score (patient satisfaction), EuroQol five-dimension five-level score (EQ-5D-5L), radiological union, complications, elbow range of motion, and re-operations related to the injury or to remove metalwork. An economic evaluation will assess the cost-effectiveness of treatments. Discussion. There is currently no high-quality evidence comparing the clinical and cost effectiveness of the tension suture repair to the traditional tension band wiring currently offered for the internal fixation of displaced fractures of the olecranon. The Simple Olecranon Fracture Fixation Trial (SOFFT) is a randomized controlled trial with sufficient power and design rigour to provide this evidence for the subtype of Mayo grade IIA fractures. Cite this article: Bone Jt Open 2023;4(1):27–37

Avulsion fractures of the tip of the olecranon are a common traumatic injury. Kirshner-wire fixation (1.6mm) with a figure of eight tension band wire (1.25mm) remains the most popular technique. Hardware removal mat be required in up to 80% of cases. Modern suture materials have very high tensile strength coupled with excellent usability. In this study we compare a repair using 1.6mm k-wires with a 1.25mm surgical steel, against a repair that uses two strands of 2 fibrewire.

Twelve Pairs of cadaveric arms were harvested. A standard olecranon osteotomy was performed to mimic an avulsion fracture. In each pair one was fixed using standard technique, 2 × 1.6mm transcortical ?-wire plus figure of 8 loop of 1.25mm wire. The other fixed with the same ?-wires with a tension band suture of 2.0 fibrewire (two loops, one figure of 8 and one simple loop). The triceps tendon was cyclically loaded (10-120 Newtons) to simulate full active motion 2200 cycles. Fracture gap was measured with the ‘Smart Capture’ motion analysis system. The arm was fixed at 90 degrees and triceps tendon was loaded until fixation failure, ultimate load to failure and mode of failure was noted.

The average gap formation at the fracture site for the suture group was 0.91mm, in the wire group 0.96mm, no specimen in either group produced a significant gap after cyclical loading. Mean load to failure for the suture group was 1069 Newtons (SD=120N) and in the wire group 820 Newtons (SD=235N).

Both types of fixation allow full early mobilisation without gap formation. The Suture group has a significantly higher load to failure (p=0.002, t-test). Tension Band suture allows a lower profile fixation, potentially reducing the frequency of wound complications and hardware removal.

We present a biomechanical cadaveric study investigating the effect of type II Superior Labrum Anterior Posterior (SLAP) lesions on the load-deformation properties of the Long Head of Biceps (LHB) and labral complex. We also report our assessment of whether repair of the type II SLAP lesion restored normal biomechanical properties to the superior labral complex.

Using a servo-controlled hydraulic material testing system (Bionix MTS 858, Minneapolis, MA), we compared the load-deformation properties of the LHB tendon with:

the LHB anchor intact;

Seven fresh-frozen, cadaveric, human scapulae were tested. We found that the introduction of a type II SLAP lesion significantly increased the toe region of the load deformation curve compared to the labral complex with an intact LHB anchor. The repair techniques restored the stiffness of the intact LHB but failed to reproduce the normal load versus displacement profile of the labral complex with an intact LHB anchor.

Of the two suture techniques, the mattress suture best restored the normal biomechanics of the labral complex.

We conclude that a type II SLAP lesion significantly alters the biomechanical properties of the LHB tendon. Repair of the SLAP lesion only partially restores the biomechanical properties. We hypothesise that repairs of type II SLAP lesions may fail at loads as low as 150N, hence the LHB should be protected following surgery.

To report the results of the vertical apical suture Bankart lesion repair. Fifty-nine patients (52 men and 7 women) with a mean age of twenty-seven years (range, 16 to 53 years) were studied. The mean duration of instability was 4. 1 years and mean follow-up was 42 months (range 24 to 58 months). A laterally based T-shape capsular incision was performed with the horizontal component directed towards the glenoid neck and into the Bankart lesion. A vertical apical suture through the superior and inferior flaps of the Bankart lesion, tightens the anterior structures to allow them to snug onto the convex decorticated surface of the anterior glenoid. The inferior flap of the capsule was then shifted superiorly and the superior flap shifted inferiorly to augment the anterior capsule, with the shoulder in 20 degrees of abduction and 30 degrees of external rotation. At final review, according to the system of Rowe et al., 94. 9% (56 patients) had a rating of good or excellent. Three patients had a recurrent dislocation due to further trauma. The mean loss of forward elevation was 1 degree, external rotation with the arm at the side was 2. 4 degrees and external rotation in 90 degrees abduction was 2. 2 degrees. Of forty-four patients participating in sport, thirty-five (79. 5%) returned to the same sport at the same level of activity, seven returned to the same sport at a reduced level of activity and two patients did not return to sport. The vertical apical suture repair offers a 94. 9% stability rate, a maintained range of motion and a 79. 5% return to pre-injury level of sporting activity. It is technically less demanding than the Bankart procedure. All sutures used are absorbable. Complications related to non-absorbable implants and absorbable anchors and tacks are avoided

Restoring of anatomic footprint may improve the healing and mechanical strength of repaired tendons. A double row of suture anchors increases the tendon-bone contact area, reconstituting a more anatomic configuration of the rotator cuff footprint. We aimed to investigate if there were differences in clinical and imaging outcome between single row and double row suture anchor technique repairs of rotator cuff tears. We recruited 60 patients affected by a rotator cuff tear diagnosed on clinical grounds, magnetic resonance imaging evidence of cuff tear and inadequate response to nonoperative management, an unretracted and sufficiently mobile full-thickness rotator cuff lesion to allow a double row repair found at the time of surgery. In 30 patients, rotator cuff repair was performed with single row suture anchor technique (Group 1). In the other 30 patients, rotator cuff repair was performed with double row suture anchor technique (Group 2). 8 patients (4 in the single row anchor repair group and 4 in the double row anchor repair group) were lost at follow up. A modified UCLA shoulder rating scale was used to evaluate preoperative and postoperative shoulder pain, function and range of motion, strength and patient satisfaction. All patients received a post-operative MR arthrography at the final follow up appointment. At the 2 year follow-up, no statistically significant differences were seen with respect to the UCLA score and ROM values. Post-operative MR arthrography at 2 years of follow up in group 1 showed intact tendons in 14 patients, partial thickness defects in 10 patients and full thickness defects in 2 patients. In group 2, MR arthrography showed an intact rotator cuff in 18 patients, partial thickness defects in 7 patients, and full thickness defects in 1 patient. Biomechanical studies comparing single versus double row suture anchor technique for rotator cuff repair show that a double row of suture anchors increases the tendonbone contact area and restores the anatomic rotator cuff footprint, providing a better environment for tendon healing. Our study shows that there are no advantages in using a double row suture anchor technique to restore the anatomical footprint. The mechanical advantages evidenced in cadaveric studies do not translate into superior clinical performance when compared with the more traditionally, technically less demanding, and economically more advantageous technique of single row suture anchor repair

Research in to tendon-bone healing techniques focus on increasing bone growth at the interface such as cell or growth factor (e.g. BMP-2) augmentation. Demineralised bone matrix (DBM) is osseoinductive and is in use clinically.

Hypothesis: DBM augmentation of a healing tendon-bone interface will result in improved function at 3, 6, 9 and 12 weeks, and a morphology that more closely resembles that of a normal enthesis at 12 weeks.

Materials and methods: An ovine patellar tendon model was used. 19 skeletally mature ewes were allocated to the control group or DBM group. In both groups the patellar tendon was detached, and following tibial tubercle osteotomy, was re-attached using 3 suture anchors. In the DBM group a piece of DBM was placed between the tendon and bone. 2 animals were sacrificed at 6 weeks and 6 animals at 12 weeks. Animals underwent force plate analysis at 3, 6, 9 and 12 weeks. The tendon-bone interface length which was fibrous or fibrocartilaginous, and the area of fibrocartilage, mineralised fibrocartilage and new bone was quantified.

Results: 3 control group animals (33%) failed within 6 weeks. None failed in the DBM group. The DBM group was significantly better than the control at all time points (p< 0.05). DBM produced a significantly more fibrocartilaginous enthesis than the control group (p< 0.05). Controls were significantly more fibrous than the DBM group (p< 0.05). DBM produced significantly more fibrocartilage (p< 0.05), and mineralised fibrocartilage (p< 0.05).

Discussion: 33% of the control group failed within 6 weeks, whilst no failures were observed in the DBM group. DBM animals mobilised earlier and had significantly better function at all time points. Histologically, the DBM group showed a more mature direct type enthesis at earlier time points.

Conclusion: DBM augmentation of a healing tendon-bone interface enhances functional and morphological recovery at earlier time points.

Abstract. Introduction. Augmentation of meniscus repairs with fibrin clot may enhance the healing capacity. Pulling the clot into the tear with a suture ensures that it stays in position. This paper aims to assess the outcome of this technique. Methods. 52 patients over 4 years undergoing suture repair of a meniscus tear with blood clot augmentation were collected from a prospective database. Follow up included outcome scores and a questionnaire. Failure was defined as pain or further surgery secondary to meniscal pathology. Results. There were 32 males and 20 females, mean age of 35 (14–70). The medial meniscus was repaired in 32 knees and the lateral in 20. Complete radial tears were the most common type. Only 2% of tears were in the red-red zone. Follow-up ranged from 12 months to 7 years. Only 1 patient is known to have come to subsequent arthroscopy. Lysholm scores improved from 53.97 (SD 18.14) to 92.08 (SD 8.97), Oxford Knee Scores from 29.84 (SD 9.65) to 45.79 (SD 2.66), KOOS pain scores from 61.49 (SD 22.76) to 93.54 (SD 8.06) and Tegner scores from 4.56 (SD 3.35) to 6.05 (SD 2.41). Conclusions. Pulling a fibrin blood clot into a meniscus tear with a suture ensures that the clot remains in place while the meniscus is repaired. Patients have shown excellent outcomes with 98% survivorship at 45 months. This is a reliable technique for augmenting meniscus repairs especially for tears which otherwise may not have been repaired

Background. Instability is one of the most common complications after total hip arthroplasty (THA), particularly when using the posterior approach. Repair of the posterior capsule has proven to significantly decrease the incidence of posterior hip dislocation. The purpose of the present study is to evaluate if braided polyblend suture provides a stronger repair of the posterior soft tissues when compared to a non-absorbable suture repair after a posterior approach to the hip. Methods. Ten cadaveric hips from donors who were a mean (and standard deviation) of 80 ± 9 years old at the time of death were evaluated after posterior soft tissue repair utilizing two different techniques. Five specimens were repaired using no. 2 non-absorbable sutures while five specimens had a repair utilizing braided polyblend suture with a rucking hitch knot technique. Cadaveric specimens were matched based upon age, sex, and laterality. Biomechanical tensile testing using the Instron E10000 Mechanical Testing System and the mechanism of failure were assessed. Results. The ultimate load to failure was three times higher using braided polyblend suture (390.00 ± 129.08 N) compared to non-absorbable sutures (122.81 ± 82.41 N) after posterior soft tissue repair (P<.01). In the braided polyblend suture cohort, the mechanism of failure occurred as the braided suture pulled through the posterior soft tissues. However, in the non-absorbable suture repair, failure took part at the suture knot. Conclusion. The use of our braided polyblend suture technique provides for a stronger repair of the posterior soft tissues when compared to non-absorbable suture repair following a posterior approach to the hip joint

Fibular head avulsion fractures represent a significant injury to the posterolateral corner of the knee. There is a high rate of concomitant injuries including rupture of the cruciate ligaments. Surgical fixation is indicated to restore stability, protect repaired or reconstructed cruciate ligaments and possibly decrease the likelihood of degenerative change. The current presentation describes a novel technique which provides secure fixation to the fibular head, restoring integrity of the posterolateral ligament complex and facilitating early motion. We also present a case series of our experience by a single surgeon at our tertiary referral center. Twenty patients underwent open reduction and internal fixation between 2006 and 2016 using a large fragment cannulated screw and soft tissue washer inserted obliquely from the proximal fibula to tibia. Fixation was augmented with suture repair of the lateral collateral ligament and biceps tendon. The orientation of the fracture was assessed based on preoperative imaging. Repair / reconstruction of concomitant injuries was performed during the same procedure. Early range of motion was initiated at 2 weeks postoperatively under physical therapy guidance. All patients returned for clinical and radiographic assessment (average 3.5 years). All fractures went on to bony union. There were no reoperations for recurrent instability. All patients regained functional range of motion with mean extension of 0.94 degrees and mean flexion of 121.4 degrees. Two patients underwent hardware removal. One patient developed a late local infection, which occurred greater than 5 years after surgery. Eleven patients underwent postoperative varus stress radiographs which demonstrated less than 1 mm difference between the operated and contralateral side. Fracture morphology typically demonstrated an oblique pattern in the coronal plane and a transverse pattern in the sagittal plane. This study represents a novel surgical technique for the repair of fibular head avulsion fractures with a large fragment cannulated screw placed obliquely from the fibula to tibia. Fixation is augmented with a soft tissue washer and suture repair. Our results suggest that this technique allows for early range of motion with maintenance of reduction, high rates of union, and excellent postoperative stability

Passive and active elbow flexion was performed in eight cadaveric arms to determine the effect of Type 1 coronoid fractures and suture repair on kinematics. Testing was performed in ligamentously intact and MCL deficient elbows; with radial head arthroplasty (RHA); with an intact coronoid, following a Type 1 fracture, and with suture repair of the coronoid. There was an alteration in elbow kinematics and stability following Type 1 coronoid fractures that was not corrected with coronoid repair. Suture fixation of the coronoid is probably unnecessary if the lateral ligaments are repaired and the radial head is repaired or replaced. To determine the effect of fixation of Type 1 coronoid fractures on elbow stability and kinematics in ligamentously intact and medial collateral ligament (MCL) deficient elbows with radial head arthroplasty (RHA). Type 1 coronoid fractures cause changes in elbow kinematics and stability that are not corrected with suture repair. Suture fixation of Type 1 coronoid fractures is probably unnecessary if the lateral ligaments are repaired and the radial head is repaired or replaced. With intact ligaments, there was an increase in valgus angulation following a Type 1 coronoid fracture (p< 0.05) that was not corrected with fixation. With MCL deficiency, there was no change in valgus angulation for all coronoid states. For both ligament states, there was an increase maximum varus-valgus laxity after a Type 1 coronoid fracture with forearm pronation (p=0.03) that was not corrected with fixation (p=0.4). Kinematic data was collected from eight cadaveric arms during passive and simulated active elbow motion. The protocol was performed in stable and MCL deficient elbows with RHA. Testing occurred with the coronoid intact, following Type 1 coronoid fracture, and with suture repair of the fracture. Valgus angulation and maximum varus-valgus laxity were measured. With intact ligaments, Type 1 coronoid fractures cause an alteration in elbow kinematics and laxity that is not corrected with suture fixation. With MCL disruption, Type 1 coronoid fractures have no effect on elbow kinematics and a small effect on laxity that is not corrected with coronoid repair. Funding: Research and Institutional Support received from Wright Medical Technologies. Please contact author for graphs and/or diagrams

Objective: The aim of this study was to compare different patellar tendon repair constructs. Materials and Methods: Eight pairs of cadaveric legs were used to compare metal suture anchor repair with “standard” Krakow tendon suture through patella bone tunnels and steel box wire augmentation loop repair. Each leg was retested with box wire augmentation loop and simple 2/0 polyglactin suture repair. The repairs were tested by mounting the legs on a specially designed rig on a materials testing machine which allowed the leg to be cycled from 90° knee flexion to full extension. The specimens were cycled 1000 times at 0.25Hz or until the repair failed. Optical markers were attached to the leg which enabled the repair gap and knee angle to be monitored during testing (Smart Capture and Analyser Tracking system, Padua, Italy). Results: Six out of eight suture anchor repairs failed, all suture bone tunnel repairs with augmentation loops completed 1000 cycles. One out of 16 augmentation loop with simple 2/0 suture repair failed. For all specimens regardless of repair type that completed 1000 cycles there was no significant difference in repair gap distance. Conclusion: Suture anchors alone do not provide a strong enough construct for patellar tendon repair. The box wire augmentation loop is key to maintaining patellar tendon repair. Krakow tendon sutures secured through patellar bone tunnels do not provide additional benefit to a simple appositional suture and box wire augmentation loop

Abstract. INTRODUCTION. To preserve knee function and reduce degenerative, meniscal tears should be repaired where possible. Meniscal wrapping with collagen matrices has shown promising clinical outcome (AAOS meniscal algorithm), however there is limited basic science to support this. AIM. to model the contact pressures on the human tibial plateau beneath a (1) a repaired radial meniscal tear and (2) a wrapped and repaired radial meniscal tear. METHODOLOGY. Complete anterolateral radial tears were formed across 4 lateral human menisci, before repairing with ‘rip-stop’ H sutures using 2mm Arthrex Meniscal Suture tape. This was then repeated with the addition of a ChondroGide collagen matrix wrapping. From this experimental setup a finite element (FE) analysis model was construted. FE models of the two techniques (i) suture alone and (ii) suture and collagen-matrix wrap, were then modelled; bone was linear elastic, articular cartilage was a hyperelastic Yeoh model, and a linear elastic and transversely isotropic material model for the meniscus. The contact areas of the articulating surfaces, meniscus kinematics, and stress distribution around the repair were compared between the two systems. RESULTS. Meniscal suture-tape repair had higher local stresses and strains (σ_max=51 MPa ε_max=25%) around the repair compared to with Collagen wrapping (σ_max=36.6MPa ε_max=15%). Radial displacement and pressure on the meniscal contact surfaces were higher in the suture only repair. CONCLUSION. Collagen-matrix wrapping strengthens the repair, reducing local peak stresses and strains around the suture-tape. This could reduce the chance of suture-tape pull-out and subsequent repair failure

Background. Acetabular labral tears can cause pain and microinstability and are the most common indication for hip arthroscopy. Hip labral repair demonstrates better clinical outcome scores at a mean of 3.5 years post surgery than labral excision and tends to be performed in a younger age group. While different labral stitch configurations are possible, the most frequently used are a mattress stitch passed though the hip labrum at its widest part, or a simple loop surrounding the labrum. To determine the strength of variousrepair techniques and the impact suture passer sizesonhip labrum failure after cyclic loading. Methods. 35 unattached fresh-frozen bovine hip labrums were assigned to 5 repair techniques (7 specimens each): Group 1: horizontal mattress using a penetrating grasper; Group 2: vertical mattress using a penetrating grasper; Group 3: vertical mattress using asuture lasso; Group 4: Oblique repair using a penetrating grasper; Group 5: vertical mattress using a penetrating grasper and monopolar radio frequency device. Using a materials testing machine and after a 10N preload, each contruct was subjected to 20 cycles at 5N–80N. Cyclic elongation, peak-to-peak displacement, ultimate failure load, stiffness, and failure mode were recorded. Results. Group 1 (249N) had lower ultimate load than groups 2 (277N), 3 (289N), 4 (281N), and 5 (278N) (p<0.05) and higher peak to peak displacement, cyclic elongation (14mm) than group 3 (12mm) (p<0.05). Group 2 (15mm) had higher peak to peak displacement than group 3 (p<0.05). Group 3 had lower cyclic elongation and peak to peak displacements than group 4 (p<0.05). Conclusion. A horizontal mattress hip labrum repair demonstrates lower ultimate failure load than a vertical mattress or an oblique suture repair. A smaller diameter suture passing device demonstrated less cyclic displacement but no difference in ultimate failure load than a large diameter device. Radiofrequency treatment did not have any effect on the strength of the suture repair configuration. Level of evidence. Level 5

Rotator cuff tears are a common cause of shoulder pain and dysfunction. Therefore, the purpose of this in-vitro biomechanical study was conducted to determine the effects of simulated tears and subsequent repairs of the rotator cuff tendons on joint kinematics. Eight paired fresh-frozen cadaveric shoulder specimens (mean age: 66.0 ± 8.7 years) were tested using a custom loading apparatus designed to simulate unconstrained motion of the humerus. Cables were sutured to the rotator cuff tendons and the deltoid. Loads were applied to the cables based on variable ratios of electromyographic (EMG) data and average physiological cross-sectional area (pCSA) of the muscles. An electromagnetic tracking device (Flock of Birds, Ascension Technologies, VT) was used to provide real-time feedback of abduction angle, to which the loading ratio was varied correspondingly. 2 and 4cm tears were made starting at the rotator cuff interval and extending posteriorly. Specimens were randomised to receive either single or double suture anchor repair. In order to quantify repeatability, five successive tests on each of the intact, torn, and repaired cases were performed. Statistical significance was established using One- and Two-way Repeated Measured ANOVAs (p< 0.05). Rotator cuff tears caused alteration in glenohumeral kinematics. A 2cm tear caused the humerus to consistently move posterior through the arc of abduction; however, as the tear increased to 4cm the humerus moved anteriorly, returning towards the intact state. Double row suture anchor repairs more accurately reproduced the kinematics of the intact specimen compared to single row suture anchor repair. The initial posterior displacement in the plane of elevation with the sectioning of the supraspinatus is related to the diminished anterior moment on the glenohumeral joint. As the tear proceeds into the infraspinatus, the anterior and posterior forces become more balanced and a return to near normal intact kinematics was observed. This study demonstrates that double row suture anchor repair more accurately reproduces active shoulder kinematics of the intact shoulder specimens

Purpose The tensile strength of the isolated Medial Patellofemoral Ligament (MPFL) is unknown. The strength required of reparative or reconstructive procedures to re-constitute this major patella stabilising structure are therefore unknown. Method 10 fresh cadaveric right (6 female 4 male) knees, mean age 71.6 (SD 16.6) years, were prepared to isolate the MPFL between the patella and the Medial Femoral Condyle (MFC). The tensile strength and mode of failure were then determined. The ligament was then repaired using a suture and the tensile strength of this determined. The ligament was then reconstructed in three ways including: Biodegradable corkscrew anchors and two tendon techniques with interference screws. One method used a blind tunnel into the MFC, while the other passed through a tunnel in the femoral condyles. Both methods passed through tunnels in the patella. Results The mean ultimate tensile strength of the isolated MPFL was 207.9 (SD 90.1) Newtons. Seven specimens failed through a mid-substance tear while three pulled off the MFC. The mean strength of the suture repair was 36.7 (SD 26.5) Newton. The biodegradable bone anchor gave a mean strength of 142.3 (SD 38.5) Newton. The blind tunnel hamstring reconstruction’s had a mean strength of 126 (SD 20.8) Newton. The double tunnel hamstring reconstruction’s failed at a mean of 195.0 (SD 65.6) Newton. Conclusion The force required to rupture an isolated MPFL appears to be approximately 210 Newton. Suture repair is insufficient to reconstitute this. Reconstruction with bone anchors or hamstring tendon techniques come close to this

It is unusual to require the use of a total knee implant with more constraint than a posterior-stabilised post in primary knee arthroplasty. The most common indication is a knee with a severe deformity, usually fixed valgus with an incompetent medial collateral ligament, and an inability to correctly balance the knee in both flexion and extension. The pre-operative deformity is usually greater than 15–20 degrees fixed valgus and may be associated with a severe flexion contracture. This is usually seen in an elderly female patient with advanced osteoarthritis. Those pre-operative diagnoses more likely to require a constrained design include advanced rheumatoid arthritis, true neuropathic joint, and the “Charcot-like” joint due to bone loss or crystalline arthritis. Rarely, patients with periarticular knee Paget's disease of bone may require more constraint following correction of a severe deformity through the knee joint. Beware those patients with a staple or screw at the medial epicondyle or those with severe heterotopic ossification at the medial joint line, as this may signify a serious prior injury to the medial collateral ligament. Finally, there is a possibility of inadvertent division of the medial collateral ligament intra-operatively. Although this situation may be treated with suture repair and bracing, my choice is to switch to more constraint and early unbraced motion. There are over 20 designs of varus-valgus constrained components, with a variety of tibial post designs with specific rotary and angular biomechanics, and many have the option of adding modular stems. Our experience with constrained, non-linked designs has been favorable with both the use of nonmodular and modular stem extensions. Longer-term survival analysis has shown a 96% survival at 10 years with these constrained components. However, the older designs frequently required a lateral retinacular release for proper patella tracking, and there were patella complications (fracture and osteonecrosis) in 16%. With a more modern design, over the past 12 years, the need for a lateral retinacular release and patella complications have been notably decreased. Varus-valgus constrained components have a small but important role in primary total knee arthroplasty for patients with severe deformity or an incompetent medial collateral ligament

The absence of menisci in the knee leads to early degenerative changes. Complete radial tears of the meniscus are equivalent to total meniscectomy and repair should be performed if possible. The purpose of this study was to biomechanically compare the cross suture, hashtag and crosstag meniscal repairs using all-inside implants for radial tears. Radial tears were created at the mid-body of 36 fresh-frozen lateral human menisci and then repaired, in randomiSed order, with Fast-Fix™ 360s (Smith & Nephew, Andover, MA) using the cross suture, hashtag and crosstag techniques. The repaired menisci were tested using an Instron Electropuls E10000 (Instron, Norwood, MA). The tests consisted of cyclic loading from 5 to 30N at 1Hz for 500 cycles, then a load to failure test. Displacement following cyclic loading, load at 3mm of displacement, load to failure, and stiffness were recorded. Any differences between repairs were assessed using Kruskal-Wallis and Mann Whitney tests (p<0.05). Cross suture repairs displaced more following cyclic loading and resisted less load to failure than both the hashtag and crosstag repairs. However, these differences were not statistically significant. The average displacement following cyclic loading of cross suture, hashtag, and crosstag repairs was 4.34 mm (±2.02 mm), 3.46 mm (±2.12 mm), and 3.24 mm (±1.52 mm) respectively (p=0.33). Maximal load to failure was 64.83 N (±17.41 N), 74.52 N (±9.03 N), and 74.98N (±10.50N), respectively (p=0.419). All-inside cross suture, hashtag and crosstag repairs all displaced >3mm with cyclic loading, which is the threshold for meniscal insufficiency. This contrasts previous studies using inside-out sutures, where crosstag and hashtag repairs resisted cyclic loading (< 3mm). Inside-out suturing for radial tears of the lateral meniscus currently remains the gold standard

Objective. The objective of this study was to assess the biomechanical stability of three types of chondral flap repair and a hydrogel scaffold implantation on the acetabular articular surface using a physiological human cadaveric model. Methods. Chondral flaps were created in the antero-superior zone of the acetabulum in a series of human cadaveric hip joints. The chondral flap was repaired by fibrin glue, cyanoacrylate, suture technique and an agarose hydrogel scaffold sealed with fibrin glue using 6 hips in each case. After each repair, the specimens were mounted in a validated jig and tested for 1500 gait cycles. In order to determine the stability of the repair, specimens were evaluated arthroscopically at specific intervals. Results. The fibrin glue and cyanoacrylate techniques were technically the easiest to perform arthroscopically, all flaps repaired with fibrin were detached at 50 cycles while those repaired with cyanoacrylate lasted for an average of 635 cycles. On the other hand, both the suture repair and scaffold implantation techniques were more technically challenging but were both stable till the endpoint of 1500 cycles. Conclusion. Fibrin glue on its own does not provide sufficient fixation to repair chondral flaps on the acetabular surface. Cyanoacrylate repairs universally failed midway through the testing protocol employed here, raising doubts as to the effectiveness of that technique. The suture and hydrogel scaffold technique were the most reliable for chondral repair at any given cycle. The results of this biomechanical study demonstrate the relative effectiveness of chondral repair and fixation techniques with sutures and hydrogel scaffolds on the acetabular chondral surface

Aims

The aim of this study was to evaluate the cost-effectiveness of arthroscopic partial meniscectomy versus physical therapy plus optional delayed arthroscopic partial meniscectomy in young patients aged under 45 years with traumatic meniscal tears.