

Dr. Kartik Shenoy, a board-certified orthopaedic spine surgeon who treats all conditions of the spine. With a distinguished career that spans military service, academic research, and advanced surgical training, Dr. Shenoy brings exceptional expertise to our practice. Whether you are dealing with chronic back pain, a disc condition, or a complex spinal disorder, Dr. Shenoy is here to restore your movement, relieve your pain, and help you get back to living fully.
Prior to joining Princeton Orthopaedic Associates, Dr. Shenoy served as a Lieutenant Colonel in the United States Air Force. He held the role of Chief of Spine Surgery and Orthopaedic Medical Director at Nellis Air Force Base in Las Vegas, Nevada, and deployed to the Middle East during his service. This experience reflects his commitment to providing the highest level of care under any circumstances, a dedication he now brings to every patient he treats.





Dr. Shenoy earned his Bachelor of Science from Cornell University before completing his Doctor of Medicine degree at Albert Einstein College of Medicine. He went on to complete his orthopaedic surgery residency at NYU Hospital for Joint Diseases and Langone Orthopedic Hospital in New York City.
He then completed his orthopaedic spine surgery fellowship at the renowned Rothman Orthopaedic Institute in Philadelphia, where he trained under internationally recognized leaders in spine surgery, Drs. Alex Vaccaro and Alan Hilibrand.

Dr. Shenoy has authored numerous peer-reviewed publications, book chapters, and presentations focusing on spinal disorders, surgical techniques, and outcomes research. His work has appeared in leading journals such as The Spine Journal, Clinical Spine Surgery, and World Neurosurgery. He also serves as Deputy Editor of Surgical Techniques for the Clinical Spine Surgery journal and is a board member of the Clinical Orthopaedic Society.
Dr. Shenoy performs all spine procedures, including disc replacement, minimally invasive surgery, laminectomy, microdiscectomy, and cervical and lumbar fusions. He has a particular interest in cervical and endoscopic spine surgery, using the latest technology and individualized treatment plans to deliver the best possible outcomes for his patients.

"Your spine is central to your life. My goal is to restore your movement, relieve your pain, and help you get back to living fully using the latest technology and individualized treatment plans." Outside of the clinic, Dr. Shenoy was born and raised in Long Island, New York, and enjoys spending time with his family, skiing, and playing golf.
You can learn more about Dr. Shenoy here. Don't hesitate to contact our office today to schedule your appointment with Dr. Shenoy. We look forward to helping you achieve optimal health and recovery.
The pectoralis major is the substantial chest muscle responsible for inward rotation as well as pushing and lifting with the arm; an injury to its tendon can be a significant matter. You are most likely to sustain such an injury while weightlifting, the bench press in particular. What begins as a minor strain has the potential to develop into a full tear of the tendon from the bone.
Should there be a sudden pop in the shoulder or chest followed by weakness, bruising or pain, a proper evaluation is warranted. An early diagnosis will allow your care team to determine if rest and rehabilitation will suffice or if surgery is called for to get function back.
Those who find they are having difficulty with their workouts or sports, or with simple acts of pushing and lifting, would do well to be aware of the typical symptoms. Knowing what to look for means you can put together a treatment plan suited to the demands of their activity level and get the necessary care without delay.

Situated on the front of the chest, the pectoralis major is a broad muscle. Its function is to drive power in pushing movements while also drawing the arm in and rotating it toward the body.
As the muscle nears the humerus, or upper arm bone, it tapers off into a tendon. A tear in the pectoralis major may occur in the muscle belly itself, at the musculotendinous junction or where the tendon inserts. In fact, you will often see avulsions of the tendon in the vicinity of the humerus.
A tear of the pectoralis major tendon is frequently the result of some forceful exertion. One need only consider the heavy bench press for a typical example; it is in the lowering part of the movement, with the muscle on a stretch and bearing weight, that such injuries are most common.
Contact sports like football or wrestling are another culprit, as is any activity that puts an abrupt strain on the shoulder and chest. Those who have suffered it will often recount a sharp pain and the distinct feeling of something giving way.

Symptoms can vary depending on whether the injury is a strain, a partial tear, or a full rupture. A complete tear often causes stronger pain and noticeable weakness right away, but some partial injuries may look less dramatic at first.
Some patients notice one side of the chest looks flatter or uneven compared with the other side. This visible change can suggest the tendon has separated or the muscle is not working the way it should.
These injuries often occur in active adults, especially men between the ages of 20 and 40 who do strength training. Heavy bench pressing is a well-known risk factor, particularly when form breaks down under heavy load.
That said, the injury is not limited to competitive lifters. Anyone who puts a sudden, strong force across the chest and shoulder can develop a pectoralis major tendon tear.
A clinician will begin the diagnostic process by hearing your account of the incident and then conducting a thorough physical examination. There he or she is looking for any signs of bruising, tenderness or weakness in the chest muscle, as well as alterations in its shape.
To verify a tear and determine if it is partial or complete, an MRI is the usual course of action; it provides a clear picture of the extent of tissue involvement and the location of the tendon injury. An ultrasound can be of some use in certain circumstances.
| Injury Type | What It Means | Typical Effect |
|---|---|---|
| Strain | The muscle or tendon is overstretched but not fully torn. | Pain and soreness, but strength may still be fairly good. |
| Partial tear | Only part of the tendon or muscle is torn. | Pain, weakness, and some loss of function. |
| Complete tear | The tendon fully separates, often near the upper arm bone. | More significant weakness, bruising, and chest contour change. |
In certain cases, a non-surgical approach is the sensible course of action. This applies to partial tears or damage to the muscle belly, and for those whose occupation or sporting pursuits do not demand maximum strength or heavy lifting. Treatment usually focuses on protecting the area, managing pain, and slowly restoring motion with physical therapy.
Even when surgery is not needed, evaluation still matters. Some problems that feel like a strain turn out to be a tendon tear, and the treatment plan may change based on what is actually injured.
In the case of a complete tendon tear, surgery is an option to be weighed. This is particularly so for active individuals looking to put in the work to get their strength back and resume sports or weight training, or those with physically taxing jobs. The intent is to put the tendon back together once it has been separated, provided the circumstances are right.
How one proceeds with treatment will hinge on a number of factors: where and how bad the tear is, when it occurred, and what your objectives are. There is often an advantage to having an evaluation done in short order after the injury; before scar tissue has a chance to form and the tendon retracts, the repair can be more straightforward. The care team is there to put things in perspective and let you know what can be expected.
You should be evaluated promptly if you notice:
Early assessment helps confirm the injury and guides the treatment plan. Getting care sooner can give you more options, especially when a tear is suspected.
The extent of the injury and any need for surgery will dictate the course of recovery. You have to be patient with the healing process; after all, the shoulder and chest are inextricably linked in everything from lifting to the more mundane movements of the day.
Rehab is typically a matter of stages. In the beginning, the focus is on protecting whatever repair has been done or giving a tear time to settle. As things progress, the aim is to put strength and motion back into the shoulder so that, with the care team’s input, a return to sports or heavy lifting can be made in good order.
| Stage | What to Expect |
|---|---|
| Early phase | Rest, protection, pain control, and limited use of the arm. |
| Rehabilitation phase | Gradual return of shoulder motion and supervised strengthening. |
| Return to activity | Progressive increase in daily activity, gym exercises, and sports as advised by your care team. |
Treatment is not as straightforward when a diagnosis has been put off. Over time, a torn tendon may retract, and the muscle can lose some of its normal function and look.
Should one experience pain, a deformity in the chest or persistent weakness following an injury from lifting, it is unwise to think the matter will resolve on its own. An early and proper diagnosis is the best way to safeguard shoulder function and strength for the long term.
You should schedule an evaluation if you had a sudden chest or shoulder injury and now have pain, bruising, weakness, or a change in chest shape. This is especially important if the injury happened during weightlifting or contact sports.
The team at Princeton Orthopaedic Associates is here to evaluate the injury and, where necessary, look over any imaging. We will then have a conversation about what course of action befits your objectives, be it non-surgical or a repair. For those with concerns over a chest tendon tear, an exam is in order to put together a definitive plan of action; do not hesitate to make an appointment.

Please contact us! We'd love to help.
If you have pain, please contact us and schedule an appointment. We have urgent care facilities all over New Jersey for your convenience.
This blog post is meant to be informative and should not act as a self-diagnosis tool. If you’d like to see one of our doctors, please contact us here.
PLEASE NOTE: This is provided for your general information only. If you are concerned about a Torn ACL or suspect you've sustained an ACL injury, consult a doctor immediately. Misunderstanding or misusing this information can cause harm. This information is provided only as general information about Torn ACLs and ACL injuries.
A torn anterior cruciate ligament, or ACL, can make your knee feel unstable and limit daily activities as well as sports. Below you will find what an ACL does, how tears happen, the signs to watch for, how we diagnose the injury, and the nonsurgical and surgical treatments that can help you return to what you love.
Experiencing a knee that suddenly pops, swells quickly, or feels unstable after an injury can be scary and confusing. You are not alone in this experience. People of many ages and from different athletic backgrounds come to our clinic with one shared goal: to move well again. We listen to each person, learn about their daily life and the demands of sport, and then create a plan that fits how they move, what they want to do, and what is safest for their knee as it heals. This plan can adapt over time as symptoms change, goals shift, and strength improves, always aiming for a safe return to the activities that matter most.

The ACL is one of four major ligaments that connect the thigh bone to the shin bone. It runs diagonally through the center of the knee, preventing the shin bone from sliding forward and the knee from twisting too far.
When the ACL is torn, the knee can feel loose or unstable, especially during sudden stops, pivots, or side-to-side movements. This instability can limit both everyday activities and sports.
Many ACL injuries are noncontact. A quick cut, a sudden stop, or a landing where the knee collapses inward can overload the ligament. Direct blows to the knee can also cause tears, especially in contact sports.
ACL tears are common in sports that involve jumping, cutting, and pivoting such as soccer, basketball, football, lacrosse, and skiing. Certain factors can raise risk.
Symptoms can vary, but many people report several of the following right after injury or when returning to activity.
Seek care promptly if your knee swells quickly or feels unstable. Early evaluation can reduce complications and speed recovery.

We start with a detailed history and a focused knee exam. Specific tests like the Lachman test and pivot shift help assess ACL stability.
X-rays can check for fractures or other bone injuries. An MRI is often ordered to confirm an ACL tear and evaluate the meniscus, cartilage, and other ligaments. This full picture guides the best treatment plan for you.
In the first few days, simple steps can help control pain and swelling and protect the knee.
Some people can do well without surgery, especially if their knee feels stable during daily life and they do not plan to return to cutting or pivoting sports. Others benefit from ACL reconstruction to restore stability and protect the knee during higher-demand activities. The decision is based on your symptoms, goals, activity level, knee stability, and any associated injuries.
| Approach | Who It May Suit | What It Includes | Pros | Considerations |
|---|---|---|---|---|
| Nonsurgical Management | Lower-demand lifestyles, no significant instability, ability to avoid pivoting sports | Recurrent instability, desire to return to cutting and pivoting sports or high-demand work, combined with injuries | Avoids surgery and graft harvest | May not prevent giving way during cutting or pivoting activities |
| ACL Reconstruction | Recurrent instability, desire to return to cutting and pivoting sports or high-demand work, combined injuries | Arthroscopic reconstruction with a graft, followed by structured rehabilitation | Restores knee stability for higher-demand tasks | Requires surgery and several months of rehabilitation |
For skeletally immature patients, surgeons use growth-friendly techniques to protect growth plates and allow ongoing bone development as the knee heals.
Reconstruction uses a tendon graft to create a new ACL. Grafts come from your own body, called an autograft, or from a donor, called an allograft. Your surgeon will discuss the options based on your age, sport, and personal preferences.
| Graft Type | Source | Advantages | Considerations |
|---|---|---|---|
| Patellar Tendon Autograft | Middle third of the patellar tendon with bone plugs | Strong fixation, commonly used in high-demand athletes | Possible front-of-knee discomfort and kneeling sensitivity |
| Hamstring Tendon Autograft | Semitendinosus and sometimes gracilis tendons | Semitendinosus and sometimes the gracilis tendons | Possible hamstring weakness during early recovery |
| Quadriceps Tendon Autograft | Portion of the quadriceps tendon, with or without bone plug | Thick graft size and reliable strength | Possible tenderness above the kneecap during early healing |
| Allograft | Donor tendon | No graft harvest site, shorter operative time | Higher retear rates reported in young, high-demand patients |
ACL reconstruction is typically performed arthroscopically through small incisions. The surgeon prepares tunnels in the thigh bone and shin bone, places the graft, and secures it so it can heal in place. Most patients go home the same day with a brace and crutches. It’s important to know that ACL reconstruction does not eliminate the risk of knee arthritis later in life.
Early rehabilitation focuses on reducing swelling, restoring gentle motion, and activating the quadriceps. Your care team will guide you step by step and progress your plan based on healing and testable milestones.
Time is only one part of recovery. Safe return to sport depends on strength, balance, hop testing, and movement quality. In most cases, return to cutting or pivoting sports should be based on clear milestones, not just how many weeks have passed. Your surgeon and physical therapist will assess these criteria and only clear higher-level activity after you meet them.
| Phase | Typical Timing | Primary Goals |
|---|---|---|
| Protection and Early Motion | Weeks 0 to 2 | Control pain and swelling, regain gentle extension and flexion, activate quadriceps |
| Foundation Strength | Weeks 2 to 6 | Normalize gait, improve range of motion, begin closed-chain strengthening and balance |
| Progressive Strength and Control | Weeks 6 to 12 | Advance lower extremity strength, balance, and movement mechanics |
| Running and Agility Preparation | Months 3 to 6 | Introduce light jogging, agility drills, and plyometrics when cleared |
| Return to Cutting and Pivoting Sports | Around 9 to 12 months or later | Meet strength and functional testing criteria and demonstrate safe movement patterns |
Not all ACL tears can be prevented, but careful training can lower your chances. Programs that improve how your muscles work, along with good form, help protect the knee during fast movements. Focus on strong hips and legs, balance, and flexible calves and thighs. This is especially helpful in sports that involve quick cuts and jumps.
Schedule an evaluation if your knee swells quickly after injury, feels unstable, or keeps giving way during daily life or sports. Prompt diagnosis and a clear plan can protect your knee and support a confident return to activity.
We will help you understand your options, choose a treatment path that fits your goals, and guide you through each stage of recovery. To get started, schedule an exam with our team.

Please contact us! We'd love to help.
If you have pain, please contact us and schedule an appointment. We have urgent care facilities all over New Jersey for your convenience.
This blog post is meant to be informative and should not act as a self-diagnosis tool. If you’d like to see one of our doctors, please contact us here.
There is a certain simplicity to HRV, or heart rate variability, despite the technical ring of the term. It is a matter of observing the minute time differences from one heartbeat to the next. A healthy system is not as regular as a metronome; rather, the nervous system will make its own adjustments and the spacing between beats will vary in response to what the body requires at any given moment.
By way of those small changes, you can gain some valuable perspective on how the body is coping with everything from exercise and sleep to stress and recovery. For anyone looking to be more attuned to their training and see how they are responding on a daily basis, HRV serves as a handy instrument.


HRV describes the natural variation in timing between heartbeats. Even if your pulse is 60 beats per minute, those beats are not always exactly one second apart. That small variation is normal.
The autonomic nervous system is what drives this pattern, seeing to the body’s functions that require no conscious effort like digestion, breathing and heart rate. There are two sides to it: the sympathetic, which has a way of being associated with action or stress, and the parasympathetic for rest and recovery.
As a rule, if these systems are in balance and responsive you will see HRV run higher. Put the body under some strain, however, and it is not uncommon for HRV to fall.
Those who put in the work with regular exercise, are in the process of an orthopedic recovery or putting in the hours for sports training might find HRV to be a useful measure of how the body is faring. It is not meant to supersede the advice of one’s care team, a physical exam or what you feel on any given day; rather it offers some further context for your daily decisions.
Take a dip in HRV below the norm as a possible sign that a lighter session is in order, or that more time for rest and sleep is called for. On the other hand, a trend that is improving or holding steady could be taken as evidence of sound adaptation to the training.
There are a number of things that can put an influence on HRV. In some cases the variation is in keeping with actual changes in recovery, but at other times it is merely an artefact of the measurement. You should bear in mind that what a smartwatch or fitness tracker puts out is only an estimate; the make of the device and its algorithm, to say nothing of minor setup variations, will all have an effect on the numbers.
Then there is the matter of reliability. An irregular heart, frequent ectopic beats or a pacemaker can throw off thse readings. So can a bad sensor, or bad sensor contact And if symptoms are of concern, do not be swayed by an HRV figure that appears normal or better; seek medical attention.
Because so many factors affect HRV, one isolated reading usually does not mean much on its own. Looking at patterns over time is more useful than focusing on a single number.
Seeing a short-term drop does not always mean something is wrong. It may simply be a sign that your body needs more time to recover.
Generally speaking, a higher HRV tends to point to a nervous system in good shape, one that is more adaptable and recovers well. But then again, HRV is an individual matter. A high figure is only as good as it is consistent with your own normal way of being.
Unusually high, erratic, or sudden changes are not automatically good. Such anomalies can be nothing more than an artifact of the measurement, or they may be indicative of an illness, rhythm irregularity, or simply overreaching. If you see the numbers change quickly it is worth taking a closer look at how you are feeling.
Since age, genetics, conditioning and overall health all play a part, there is considerable variation from one person to the next. Because of that you will find it more useful to have a handle on your own typical range and to be on the lookout for any changes.
There are a number of ways to put HRV in numbers, from an electrocardiogram to the sort of wearables you might have on hand: a chest strap, smartwatch or fitness tracker will do. Remember that not all devices estimate HRV in the same way; for the sake of spotting trends it is best to stick with a particular device and routine.
Consistency is what really counts. Some will find their readings altered by even minor variations in body position or activity, depending on the wearable. Many people make a point of taking their HRV first thing in the morning to get a baseline reading.
| Tip | Why It Helps |
|---|---|
| Measure at the same time each day | Improves consistency and makes trends easier to compare. |
| Use the same device | Different tools may calculate HRV differently. |
| Track trends, not single readings | Day to day values can fluctuate for many reasons. |
| Pair HRV with symptoms and recovery habits | Sleep, soreness, stress, and energy level help give context. |
| Do not use HRV by itself to make medical decisions | It is a helpful marker, but not a diagnosis. |
Those in the process of healing from an overtraining spell, a musculoskeletal injury or surgery can turn to HRV as a means of gauging how well the body is coping with stress. In the course of rehabilitation it is useful for keeping a proper day to day pace. Of course, it is best employed in conjunction with other indicators such as pain levels, swelling, strength and range of motion, as well as fatigue and sleep quality and functional gains, not to mention the input of one’s physical therapist or clinician.
Take the case where your HRV is running below normal and you are feeling more sore or run down than is typical; in that instance it makes sense to scale back. On the other hand, a steadier trend and good tolerance of therapy would be consistent with building up your activity a bit. But do not let HRV be the sole arbiter on when to get back to sport or the extent of post surgical progress.
HRV can be helpful, but it has limits. It cannot tell you exactly why your body is stressed. It also cannot diagnose a heart condition, an injury problem, or another medical issue on its own.
If your HRV stays lower than usual for several days and you also feel unwell, overly fatigued, dizzy, or unable to bounce back from the day's activities, speak with a healthcare professional. This matters more if you have a pre-existing heart condition or are concerned about any other symptoms.

Do not view HRV as a figure to be put on a pedestal; treat it more like a daily check in. When the readings are within your usual range and you are in good form, the body is likely primed for its normal routine. But should the numbers dip and you find yourself feeling sore or under stress, it is time to turn your attention to the fundamentals of recovery, sleep and hydration.
Active adults and athletes need not strive for perfection with these metrics. It is about understanding how one can make sounder choices. That can help lower the chance of burnout or setbacks.
When you find that staying active is a struggle due to pain, an injury, overtraining or simply a slow recovery, the orthopaedic specialists on our team are here to assist. We put in the time with our patients and athletes to assess how they move and determine the right course of treatment, all while formulating a plan for recovery in line with their objectives.
For those looking to put more confidence back into their exercise, sports or day to day routine, we invite you to set up an evaluation at Princeton Orthopaedic Associates.

Please contact us! We'd love to help.
If you have pain, please contact us and schedule an appointment. We have urgent care facilities all over New Jersey for your convenience.
This blog post is meant to be informative and should not act as a self-diagnosis tool. If you’d like to see one of our doctors, please contact us here.

Avoid the long waiting times in the Hospital Emergency Departments and give us a call at (609) 924-8131 to visit us at our Plainsboro.