Robert Kollmorgen

Robert Kollmorgen
California State University, Fresno | Fresno State · Orthopaedic surgery

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25
Publications
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145
Citations

Publications

Publications (25)
Article
Case The direct anterior total hip arthroplasty is known for a steep learning curve and femoral-sided intraoperative complications. This is a case report of a failure of femoral broach with a subsequent incarcerated femoral broach and novel extraction technique during a direct anterior total hip arthroplasty. This rare complication has only one oth...
Article
Case: A 22-year-old woman underwent revision right hip arthroscopy (HA) with concomitant periacetabular osteotomy (PAO). The total procedure time was 5.5 hours. After completion of the 3 hour HA portion, the traction boots were loosened. Eleven weeks postoperatively, she developed a left claw toe deformity. After failed conservative management, sh...
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Background The Patient-Reported Outcomes Measurement Information System (PROMIS) has not been fully evaluated for outcomes assessment after hip arthroscopy to correct femoroacetabular impingement syndrome (FAIS). Purpose/Hypothesis The purpose of this study was to compare the accuracy of the PROMIS Physical Function (PF) and Pain Interference (PI)...
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Introduction: Previous studies have evaluated the effect of the pericapsular nerve group block for hip arthroscopy and the transverse abdominis plane block for periacetabular osteotomy and have shown decreased narcotic consumption in both groups. No published study has evaluated the effectiveness of combining the blocks when performing hip arthros...
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Background: The use of computer navigation (CN) is expanding in direct anterior (DA) total hip arthroplasty (THA). In this study, we investigated the use of a noninvasive, fluoroscopic-based, CN technology suite on operative outcomes in a single surgeon DA THA practice. Hypothesis: Computer-navigated DA THA decreases leg length discrepancy (LLD)...
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Purpose To determine the effectiveness of pericapsular nerve group (PENG) block for patients surgically treated for femoroacetabular impingement syndrome (FAIS). Methods Consecutive patients who underwent surgical treatment of FAIS either with or without preoperative PENG block by a single surgeon were retrospectively identified. Twenty-five patie...
Article
PURPOSE To determine if there are differences in: 1) the incidence of post-related complications following hip arthroscopy between prospective and retrospective publications; and 2) between post-assisted and postless techniques. METHODS A systematic review was performed using PRISMA guidelines to characterize post-related complications following h...
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Proximal rectus femoris avulsion (PRFA) is an uncommon injury that is poorly reported in the literature. Historically, these injuries have been treated nonoperatively or with open techniques. This is the first study showing endoscopic treatment of this injury. We present a systematic review of PRFA treatment and a case report of a patient whose inj...
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Post-free hip arthroscopy has garnered much attention over the past several years. The attraction of eliminating groin complications is at the forefront of this technique. Recent studies have shown improved blood flow, safe techniques, but other benefits, if any, are yet to be discovered. For now, those adopting post-free distraction do so to elimi...
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Purpose To determine the efficacy of mandatory preoperative nicotine cessation on postoperative nicotine use, and to identify independent predictors of nicotine use relapse in subjects undergoing hip preservation surgery or total hip arthroplasty by a single fellowship-trained orthopedic surgeon. Methods Consecutive subjects that underwent hip surg...
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Symptomatic heterotopic ossification (HO) is a complication of hip arthroscopy that occurs in less than 1% of cases. To our knowledge, there are no reported cases of symptomatic intracapsular HO. We present 2 patients with a radiographic finding associated with intracapsular HO. Both patients underwent revision hip arthroscopy and required capsular...
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Purpose The purpose of this study was to determine the accuracy of self-reported non-smoking status in subjects undergoing elective orthopedic surgery as confirmed by serum cotinine levels. Methods Institutional Review Board approval was obtained for this retrospective review of consecutive subjects that underwent elective orthopedic surgery by a s...
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Anatomical understanding of the peritrochanteric space and abductor insertions has been well documented in the literature. Extrapolating this knowledge to perform a "successful" abductor tendon repair has led to controversy over the best method to achieve a durable, stable repair and improve patient outcomes. I feel that the debate in the hip over...
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Iatrogenic pudendal nerve and groin complications have been reported to occur at rates up to 4.3%. While many of these complications are transient, the hip preservation community is in search of a safe postless distraction technique. Currently available postless distraction tables are expensive, require the surgeon to adopt a different technique, a...
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Background:: Legacy hip outcome measures may be burdensome to patients and sometimes yield floor or ceiling effects. Patient-Reported Outcomes Measurement Information System (PROMIS) computer adaptive tests (CATs) allow for low-burden data capture and limited ceiling and floor effects. Purpose/hypothesis:: The purpose of this study was to determ...
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Full-text available
Objectives Current Hip Patient Reported Outcome Scores (PROs) are not universally obtained, centers use different forms to try to interpret treatment outcomes, and are limited by floor and ceiling effects. Legacy scores of Modified Harris Hip Score (mHHS), International Hip Outcome Tool (iHOT), and Hip Outcomes Score (HOS) are common place and used...
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With the continued increase in hip preservation procedures, a proper understanding of indications, technical execution, and reporting on outcomes and complications cannot be overstated. Severe complications continue to occur, and we all should take a moment to think on our own practices and ways to mitigate our complications.
Article
Background: Triangular fibrocartilage complex (TFCC) injuries are a known cause of ulnar-sided wrist pain. Wrist arthroscopy is the gold standard for diagnosis of these lesions and is becoming a more frequent method of treatment. Isolated radial-sided tears are uncommon and treatment of these lesions is controversial. There are few reports on repa...
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Full-text available
Arthroscopic labral repair and refixation have garnered much attention over the past several years. Restoration of suction seal and native labral function has been an evolving focus for achieving excellent results in hip preservation surgery. Authors have reported using several labral management techniques: débridement, labralization, looped suture...

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