BIPEDAL

Robert Weinstein

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Surgeon, Author, Educator and Inventor Dr. Robert Weinstein discusses all things foot and ankle health related. From common conditions and their conservative treatments to complex reconstructive surgical challenges, every topic will be explained in plain language for all audiences.

14 juin

Achilles Tendon Repair Rehabilitation

Achilles tendon rupture is a potentially catastrophic injury. However modern repair methods can restore the integrity of the tendon complex regardless of age or extent of injury. It is the rehabilitation protocols afterwards that are the best predictors of complete recovery, not the ability to put the tendon back together. I have repaired tendons on relatively sedentary patients, weekend warriors, and elite athletes - and everything in between. The factor that is most important for all of these patients to succeed is understanding the quality of the repair and gearing post operative rehabilitation accordingly. No two injuries and no two repairs are identical. Each has its own nuance, from the mechanism of injury, the patient's functional demands, the patients ability to comply with rehab directions, and the social safety system (home assistance) they employ. This is why a "one size fits all" repair method or rehabilitation program is destined to produce erratic results. If you understand the biologic processes and their required time to progress, you can understand the length of time these tendons need to fully heal. And the tendon is only one factor - the calf muscle strength suffers tremendously as well. Rehab programs must be designed to improve tendon elasticity while not over lengthening and coupled with strengthening to limit atrophy. This is a delicate balance. One other factor clinicians often forget is the psychological recovery. First is prolonged guarding, which can lead to prolonged recovery. Surgeons should appreciate that the longer they immobilize a patient the longer they have to become apprehensive about return to function. This must be monitored since patient engagement with rehab is essential to successful functional recovery. The content of this podcast is for educational and informational purposes only and does not constitute medical advice. Always seek the advice of your physician or other qualified health provider with any questions you may have regarding a medical condition.

15 min
11 juin

Achilles Tendon Rupture Surgery

There is debate among orthopedic and podiatric surgeons regarding operative and no operative repair of ruptured Achilles tendons. Why the debate? Because outcome studies have shown satisfactory results when comparing each treatment. These studies focus on strength restoration, pain scores, and quality of life. Unfortunately, we cannot directly compare individual patient outcomes, since a patient can only have been treated one way or the other. In my experience surgical repair is generally preferred for this injury unless there is compelling reasons to treat conservatively. This would include excessive smoking, uncontrolled systemic conditions like diabetes, demonstration of non compliance with physician direction, or extremes of age. Otherwise, this tendon can be repaired in a way that matches the contralateral limb in function and power and can be restored to its pre injury state predictably with surgical methods. That goes for chronic and delayed repairs as well. I trained in an era before percutaneous techniques emerged. Open repair is the gold standard for surgical treatment. This method allows complete visualization of the injury, direct reapproximation of the tendon ends, and the ability to match the injury to the mechanical construct required for repair. Without visualization, the surgeon cannot adequately assess the integrity of the ruptured ends, instead relying on the instrumentation that employs a "one size fits all" approach. Coupled with a higher incidence of sural nerve injury, there is little benefit in my mind to not simply opening the injury and fixing it. The content of this podcast is for educational and informational purposes only and does not constitute medical advice. Always seek the advice of your physician or other qualified health provider with any questions you may have regarding a medical condition.

17 min
6 juin

Hallux Limitus Surgery

Hallux limitus and rigidus are a spectrum of a disease involving progressive degeneration of the first metatarsophalangeal joint (MTPJ). There are multiple causes known to cause this condition, from biomechanical (elevated first metatarsal, elongated first metatarsal, etc.) to medical (gout, rheumatoid arthritis, infections, etc.) As a surgeon, I have to determine the condition of the joint at the time of presentation and the symptoms patients relate. Not all radiographically destroyed joints are symptomatic, and not all radiographically normal joints have mild symptoms. There is a spectrum of disease that has to be carefully evaluated against the conservative and surgical options available. Simple procedures like cheilectomy can buy time. Decompression osteotomies can do the same thing. However, if the joint degeneration is fairly advanced, the only likely outcome is secondary procedures. This is because the surgeon chose a procedure that increases painful motion. If a joint has undergone degeneration 'past the point of no return,' joint destructive procedures must be employed. This includes arthroplasty and arthrodesis. The former involves removing part of the joint, the latter meaning fusion or permanent removal and stiffening of the joint. In my experience, preservation of sagittal plane dominant joints (first MTPJ, ankle, knee) is critical to undisturbed gait. Therefore all measures should be explored before fusing these joints. Many patient have been referred in because they were given the only option of fusing the great toe joint. This is often not necessary, as implant arthroplasty has excellent long term survival rates in the right population and if performed technically well. The content of this podcast is for educational and informational purposes only and does not constitute medical advice. Always seek the advice of your physician or other qualified health provider with any questions you may have regarding a medical condition.

18 min
30 mai

Internal Fixation Part 3 - When Fixation Fails

Most fixation failures are not really implant failures. They are failures of the interaction between biology, mechanics and time. When assessing broken bones (or fusions, osteotomies, etc) we have to appreciate that achieving the result of bone healing is a balance between mechanical and biologic forces. Too much or too little of either is not beneficial, and occasionally is deleterious. Modern orthopedic approach is to control the influence of both. We do this with a deep reservoir of materials, implant choices, implant constructs, biologic augmentation materials, and careful assessment of critical points in the healing process. It is no longer acceptable to wonder why a bone did not heal or a fixation construct failed. With a keen understanding of fixation principles, the answer should be obvious. Then undertaking revision involves a strategy to reverse what plagued the initial attempt. The content of this podcast is for educational and informational purposes only and does not constitute medical advice. Always seek the advice of your physician or other qualified health provider with any questions you may have regarding a medical condition.

16 min
23 mai

Internal Fixation Part 2 - Fracture Biomechanics

A fracture heals biologically. But biology is governed by mechanics. Bone cells are mechanosensitive. They respond to motion, strain, compression, shear, and tension. And that means one central truth: The surgeon is not simply fixing bone. The surgeon is engineering the conditions under which biology can succeed. Strain in terms of bone healing describes the amount of motion relative to the fracture gap. Too much strain, and the local biology will favor granulation tissue formation. Small amounts of strain will lead to cartilage or callous formation, and very little strain sets up the environment for bone formation. The surgeon is tasked with determining the fracture needs - sometimes absolute stability (low strain) is required and sometimes relative stability. For example, in deformity correction and reconstructive surgery, the desire is to create absolute stability. In certain fracture scenarios, such as comminution, relative stability is preferred to allow the multiple fragments to unite without excessive compression and without further devitalizing bone. The choice of fixation- the construct, the materials, and the placement - are all variables a surgeon puts together in the operating room depending on the specific circumstances. The content of this podcast is for educational and informational purposes only and does not constitute medical advice. Always seek the advice of your physician or other qualified health provider with any questions you may have regarding a medical condition.

16 min
16 mai

Internal Fixation

Understanding internal fixation is critical to our later discussions on surgical techniques for a variety of conditions. We started in Episode 1 of Season 2 discussing bunion surgery. This was meant to be an introduction to how we approach realignment and repair of bone segments. Everything we have learned about fracture fixation in emergent conditions, we have refined and honed to use in our reconstructive efforts. Bunion surgery involves just about every surgical principle we will cover in this season - soft tissue envelopes, anatomically safe corridors, biomechanical tension and compression, deformity realignment, and bone fixation. Throughout human history we have suffered broken bones. Only until recently were broken bones stabilized with devices more complicated than a tree branch and leather straps. Once we had a grasp on aseptic techniques, metallurgy, and the biologic processes involved in bone healing, modern internal fixation of bone injury was achievable. The current methods and devices are essentially derivatives from the Swiss AO group, a collection of surgeons who outlined the important principles for the use of these devices: anatomic reduction, stable fixation, preservation of blood supply, and early mobilization of joints. Manufacturing has come a long way, with forging and machining of basic screws and plates being replaced with 3D printing and patient-specific prostheses generated from complex weight bearing CT scans. The content of this podcast is for educational and informational purposes only and does not constitute medical advice. Always seek the advice of your physician or other qualified health provider with any questions you may have regarding a medical condition.

20 min
9 mai

Bone Healing

Bone is a Living Tissue. It is formed of living cells in a matrix designed to withstand load and to constantly replace and repair itself. When injured, bone immediately begins the repair process, with dedicated cells immediately taking over and beginning a complex signaling event that ultimately results in complete restoration. Because healing is phase oriented, certain systems must in place at the right time to effect the healing cascade. This begins with inflammation, which is immune system mediated. A hematoma forms, which is filled with platelets, cytokines and growth factors. There are important meditators at work- PDGF (platelet derived growth factor), VEGF (vascular endothelial growth factor), BMPs (bone morphologic proteins), interleukins, TGFa (transforming growth factor), and more. These signaling molecules recruit osteo-progenitor cells and ignite angiogenesis. The system must maintain balance between normal inflammatory response and excessive or prolonged inflammation which can impair the process. Angiogenesis means "new blood vessel formation," a process critical to repair. The biology of bone healing thus begins with restoration of blood flow. There are two main types of bone healing - primary and secondary. Primary healing is direct laying down of matrix between two fracture ends. This occurs when there is adequate blood flow, close approximation of bone ends, stability at the fracture site, and low tissue strain. Secondary bone healing occurs when there is relative stability, not absolute rigidity. This involves a cartilage intermediary, a tissue type visible in the healing process. This concept of strain is critical to understanding how bone behaves. Strain is basically the change in gap length divided by the original gap length. Different tissue types tolerate different amounts of strain. Granulation tissue tolerates high strain, bone tolerates very low strain. This means that the tissue type that will form at a fracture site is heavily dependent on the mechanical environment. Bone healing does not like extremes. Too much motion leads to delayed healing and persistent fibrous tissue. Too little will suppress callous formation and stress shield the bone leading to poor biologic recruitment. Healing likes the environment to be stable enough but not necessarily absolutely rigid. This is the art in surgical practice - determining how and when bone needs stability, how much stability, and when to progress to load and stress again. Of course, mechanics alone are not a sure bet that the bone will heal. Biologic constitution also is a factor. Low vitamin D, low calcium levels, high sugar levels, presence of carbon monoxide, and more can lead to poor healing of bone tissue. The content of this podcast is for educational and informational purposes only and does not constitute medical advice. Always seek the advice of your physician or other qualified health provider with any questions you may have regarding a medical condition.

19 min
2 mai

Bunion Surgery

There is no simple solution to a complex problem. This is true in life, and in bunion surgery. A bunion is a complex condition resulting from either structural anomaly or biomechanical instability, and often both. Careful evaluation of the condition is required; no two bunion deformities are identical. Mistakes are made when patient expectations are unrealistic, physician capabilities are limited, there is no sound surgical plan to address every component of the deformity, or the procedure is poorly executed. The failure often occurs before the procedure is carried out. Proper planning includes complete evaluation for causation. Removing the bump may provide short term relief, but not addressing all the causative factors will result in long term failure. That is why clinical and radiographic parameters are so critical. Along with an arsenal of procedure selection in the surgeon's pocket to choose from. Distal osteotomy procedures are the least technically demanding and have the lowest complication rates. The good news, most patients will fall into this category. More proximal procedures are required for extremes of the deformity - rigidity, age of patient and deformity, and profound dynamic forces acting across the first ray. For the segment of patients that fall into this category, expectations should be set accordingly - the more complex the procedure, the more can go wrong. Nonunions, neuritis, hardware complications, and load transfer related issues all have a higher incidence with these procedures. The content of this podcast is for educational and informational purposes only and does not constitute medical advice. Always seek the advice of your physician or other qualified health provider with any questions you may have regarding a medical condition.

21 min

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Surgeon, Author, Educator and Inventor Dr. Robert Weinstein discusses all things foot and ankle health related. From common conditions and their conservative treatments to complex reconstructive surgical challenges, every topic will be explained in plain language for all audiences.

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Robert Weinstein
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