The Journal of Knee Surgery has ever acknowledged the importance of publishing high-quality case reports. Almost 2 years ago, one special supplement of this journal aimed this specialmodality of publication. As the number of submissions continued to increase, in 2014, a sister periodical was launched to address this purpose, the Journal of Knee Surgery Reports. The main scope of the new journal is to offer a premium outlet for authors willing to share interesting and welldocumented clinical cases related to knee pathology. We believe that this is a true opportunity to present rare clinical conditions, original decision-making approaches, creative solutions, and ultimate outcomes that make every case unique. In this first printed edition, we collected 14 articles, which were published online first. A variety of topics have been covered, from rare knee tumor presentations to compartment syndrome following total knee replacement. Wewould like to thank all authors, reviewers, and editorial board members for their relevant contributions to the first printed issue of this journal. To our readers, we would like to wish a rewarding experience. The Journal of Knee Surgery Reports aims to be a reference for excellence in knee-related clinical cases. To accomplish this goal, we do invite you to join us and share your expertise with a large community of knee surgeons. Be our guest and collaborator. You are very welcome to the Journal of Knee Surgery Reports. Editorial

Compartment syndrome is a well-known entity. It has been seen more commonly after trauma and crush injuries. It is quite rare after a total knee arthroplasty. Various factors which can implicate this rare sequence have been highlighted. We report here a case of compartment syndrome of calf after an elective total knee arthroplasty, along with a review of literature. Patient was managed with urgent decompression with full recovery.

This study reports the case of a fractured polyethylene tibial post in a 49-year-old white male patient at 4 years status post a left posterior stabilized total knee arthroplasty. The patient was doing extremely well postoperatively until he felt pain in the left knee while completing personal resistance squats. He was found to have anterior/posterior instability in flexion as well as midflexion instability. The patient underwent removal of the fractured polyethylene insert and replacement with a thicker insert. The patient had immediate resolution of his preoperative pain and instability. To our knowledge, this is the first reported case of a polyethylene tibial post fracture in a Genesis II total knee system (Smith and Nephew; Memphis, TN).

We report a case of an initially 16-year-old female patient, diagnosed with an osteosarcoma of her left proximal tibia. Treatment consisted of tumor resection in combination with the implantation of a customized tumor prosthesis and chemotherapy. The patient developed a deep infection and several additional surgeries were inevitable. Because of increasing bone loss the distal tibia anchoring was insufficient and a custom-made total tibial prosthesis was designed and implanted to brace against the talus. After 17 years the femoral component became loose and the upper part of the prosthesis had to be exchanged with a total femur prosthesis. To our knowledge, there is no other case reported in the literature where a patient had to be treated with a prosthesis replacing the entire femur and tibia.

The success rate for achieving knee stability in primary anterior cruciate ligament (ACL) reconstruction is high; however, the results of revision reconstruction are less satisfactory. Sagittal plane malalignment is an uncommon predisposing factor for failure because excessive posterior tibial slope increases stress on the ACL graft. In carefully selected patients, tibial slope correction is an essential adjunctive procedure to achieve a stable knee. We present a case report outlining the surgical technique for correction of sagittal plane imbalance by a slope-decreasing anterior closing wedge tibial osteotomy combined with a second-stage revision ACL reconstruction. At 2 years following surgery, our patient had a stable knee and returned to low-impact athletic activity without symptoms. Further investigation is needed to refine the indications for this procedure in the setting of failed ACL reconstruction.

Incidence of revision total knee arthroplasty is growing. Revision surgery aims at preserving the collateral ligaments to minimize implant constraint and stress on the implant-cement-bone interface. Exposure in the stiff knee can be challenging as a result of loss of soft tissue elasticity and capsular scarring brought on by multiple surgeries. If a quadriceps snip does not provide adequate visualization a quadriceps turndown or a tibial tubercle osteotomy is recommended to improve exposure. Such extensile approaches have various limitations and might risk compromising the extensor mechanism, recovery time, bone fixation, or wound healing. The current case report describes a novel technique to combine a quadriceps snip with cutting the medial collateral ligament to gain exposure. While patients require a hinged implant, the integrity of the extensor mechanism is preserved. This allows for immediate active and passive range of motion and places this approach at an advantage over a quadriceps turndown or tibial tubercle osteotomy.

Preoperative diagnosis of meniscal tears in the United States is typically determined from magnetic resonance imaging (MRI). However, MRI diagnosis of meniscal pathology is not a point-of-injury imaging modality. This results in potential treatment delays. Ultrasonography provides a method for highly reliable, immediate, and point-of-injury diagnosis of meniscal pathology. We present a case of an acute tear of the lateral meniscus in a collegiate athlete that was diagnosed in the training room immediately after injury using ultrasonography. The diagnosis was subsequently verified by MRI and arthroscopy. The patient was treated with partial meniscectomy and experienced an uneventful recovery with return to sport 3 weeks after injury. This case report supports the potential capabilities of ultrasonography as an effective and efficient point-of-injury diagnostic tool for athletes with suspected meniscal pathology.

Ruptured anterior cruciate ligaments (ACL) have doubtful healing potential. This might be better in younger patients. Therefore, treatment of an ACL rupture in the skeletally immature patient knows several strategies. We report the case of an 8-year-old, skeletally immature patient with a midsubstance-ruptured ACL at physical exam and magnetic resonance imaging (MRI). Conservative treatment with a brace led to a stable knee with regeneration of the ACL on both the physical examination and MRI after 5 years. Nevertheless, further research will be necessary to gain better understanding about the biology and healing potential of the ACL.

Drug reaction with eosinophilia and systemic symptoms (DRESS) is a severe adverse drug reaction with a mortality rate near 10% characterized by erythematous cutaneous eruption, multiorgan involvement, and hypereosinophilia. This case report highlights a patient who developed DRESS in the setting of intravenous vancomycin and a vancomycin and tobramycin-impregnated (PROSTALAC, DePuy Synthes, Warsaw, IN) functional spacer. The spacer was placed during the revision of a left total knee replacement complicated by a septic joint. To our knowledge, this is the third reported case of DRESS associated with vancomycin-impregnated spacers. As DRESS is a potentially life-threatening reaction and the principal treatment is withdrawal of the precipitating drug, it is important to consider this clinical entity and discontinue all forms of the causative agent. Patients with DRESS may develop a diffuse cutaneous eruption, respiratory failure, acute kidney injury, elevated liver enzymes, lymphadenopathy, and/or hemodynamic instability following intravenous infusion of antibiotics or placement of antibiotic-impregnated spacers, beads, or bone cement. Interestingly, this patient had a prominent and progressive erythematous eruption surrounding the left knee that improved after operative removal of the spacer. At 6 week hospital follow-up, the patient's systemic signs and symptoms had essentially resolved.

While stiffness following an injury is usually secondary to soft tissue scarring, a variety of different benign and malignant lesions may restrict range of motion about the knee. We report the unusual case of a patient who presented with a chronic knee extension contracture secondary to a large ossified mass in the anterior aspect of the knee. Radiographs, magnetic resonance imaging, and subsequent histopathology were consistent with a diagnosis of myositis ossificans of the fat pad. Subsequent resection resulted in full motion recovery and resolution of symptoms at 30-month follow-up.