One principle I return to in cartilage repair is that treating the cartilage defect is only one part of the wider problem. The mechanical environment of the knee, including the meniscus, must also be addressed because it influences the forces acting across the repair. This clinical case study shows how that principle shaped the treatment of a 53-year-old competitive golfer whose persistent knee pain, recurrent swelling, and difficulty tolerating prolonged walking and rotational movements had prevented him from continuing competitive golf. When the knee was assessed, MRI demonstrated a full thickness cartilage defect of the medial femoral condyle with associated subchondral bone marrow oedema. A medial meniscus tear was also present, affecting the load distributing environment of the same knee compartment.
Taken together, these findings meant that treatment needed to address both the cartilage injury and the meniscal pathology. The patient therefore underwent arthroscopic medial meniscus repair together with one stage cartilage restoration using a Chondro-Gide collagen scaffold augmented with bone marrow aspirate concentrate (BMAC). By six months, his pain and function had improved sufficiently for him to return to competitive golf. This clinical recovery was accompanied by follow up MRI showing good filling and surface congruity of the treated defect, together with reduction of the preoperative bone marrow oedema. Quantitative T2 relaxation value mapping or T2RV, added another layer to the assessment by showing repair tissue values predominantly within the moderate 40 to 60 millisecond range, consistent with good early repair tissue viability and maturation. To understand why this combined treatment approach was necessary, it first helps to consider how the demands of golf were affecting his knee.
Why Golf Had Become Difficult
Golf might appear to be a relatively low impact sport, but a full round places repeated demands on the knee through prolonged walking, weight transfer, rotational loading during the swing, and movement over uneven ground. For a golfer with a symptomatic cartilage defect, these repeated loads can provoke pain, swelling, and reduced confidence in the knee.
In this case, the cartilage defect wasn’t the only factor affecting the joint. A damaged meniscus can further alter how forces are distributed across the knee, and the combination of cartilage injury and meniscal pathology made both walking and rotational movement increasingly difficult, eventually preventing competitive play.
What the Knee Assessment Revealed
With golf becoming increasingly difficult, the next step was to establish what was happening within the knee. Preoperative MRI demonstrated a full thickness cartilage defect over the medial femoral condyle, with associated subchondral bone marrow oedema. Alongside the MRI, long leg standing radiographs were performed and didn’t demonstrate significant varus malalignment. While these imaging studies established the findings within the knee, arthroscopy subsequently confirmed the articular cartilage defect and allowed its true extent and stability to be assessed directly.
Why Were the Meniscus and Cartilage Repaired Together?
The assessment showed that the problem wasn’t limited to the cartilage defect. A medial meniscus tear was also affecting the load distributing environment of the same knee compartment. This is an important point to note because the meniscus contributes to load transmission, shock absorption, joint congruity, and stability. When it’s torn and no longer distributes load effectively, contact stresses might become concentrated over a smaller area of articular cartilage.
Treating a cartilage defect without addressing a clinically significant meniscus tear will therefore leave the repair tissue exposed to an unfavourable mechanical environment. In this case, my surgical strategy had two linked objectives: preserve and repair the medial meniscus to improve load distribution, and restore the full thickness cartilage defect biologically.
This reflects a broader principle in joint preservation. Cartilage repair should be planned as part of the whole knee rather than treated as an isolated patching procedure.
How Was the Cartilage Defect Repaired?
With the meniscus repair addressing the mechanical environment of the knee, the cartilage repair procedure focused on restoring the full thickness defect biologically. The surgery was performed arthroscopically as a single stage procedure. Unstable and non-viable cartilage was removed, and the defect was prepared to stable margins. A Chondro-Gide bilayer collagen I/III membrane was then templated to match the defect, augmented with BMAC, positioned within the defect and secured using fibrin glue. Stability was confirmed arthroscopically.
The aim was to create a stable biological environment within the cartilage defect while improving the mechanical environment through meniscus preservation. My colleagues and I have previously described this arthroscopic scaffold templating and implantation approach as a minimally invasive (MIS), single stage technique.
Rehabilitation and Return to Competitive Golf
With both the repaired meniscus and the newly treated cartilage surface requiring protection, early rehabilitation focused on swelling control, restoration of quadriceps activation, and protected progression of motion and loading. Strength, balance, walking tolerance, and lower limb control were then rebuilt progressively.
As these foundations improved, golf specific rehabilitation was introduced in stages. Lower demand activities preceded full swings, complete rounds, and competitive play. Even so, return to competition was based on the overall clinical picture, including symptoms, swelling, strength, movement control, and sport specific tolerance, rather than MRI findings alone.
At six months, the patient had achieved significant improvement in pain and function and was able to return to competitive golf.
What Imaging Revealed at Six Months
At six months, the patient had returned to competitive golf following significant improvement in pain and function. At the same stage of recovery, conventional MRI demonstrated good filling and surface congruity of the treated medial femoral condyle defect, together with reduction of the preoperative subchondral bone marrow oedema.
These findings showed how the repair appeared structurally. Conventional MRI is valuable for assessing the morphology of cartilage repair tissue, including defect filling, surface contour, integration with the surrounding cartilage, and changes within the underlying bone. However, morphology alone can’t fully characterise the internal composition of repair tissue. For that reason, quantitative T2RV mapping was added to the assessment.
What Does T2RV Mapping Measure?
As noted earlier, T2RV mapping was added to look beyond the structural appearance of the cartilage repair on conventional MRI. The technique uses a quantitative MRI sequence to measure T2 relaxation values across the cartilage. These values are influenced by tissue water content and collagen organisation and may provide additional information about repair tissue viability, integration, and maturation.
A 2024 study by Ow, Wang, Zhang, and colleagues, which I co-authored, used T2RV imaging to assess acellular scaffolds six months after patellofemoral cartilage repair. The investigators evaluated T2RV distribution and range together with graft surface, matrix, edge integration, and subchondral bone characteristics.
Clinical success was observed in eight of nine patients. The single unsuccessful graft displayed heterogeneously high T2RV signals together with a discontinuous matrix, features that weren’t identified in the clinically successful grafts. The study suggests that T2RV assessment should consider the distribution and spatial pattern of the signal rather than relying only on a single average value.
Even with this additional information, T2RV mapping remains an adjunct. It should be interpreted together with conventional MRI, symptoms, and functional recovery, and it doesn’t independently prove that repair tissue is histologically identical to native hyaline cartilage.
What Did T2RV Mapping Revealed in This Golfer?
Within this imaging framework, the repair tissue at six months demonstrated T2RV values predominantly within the moderate range of 40 to 60 milliseconds. As described by Ow and colleagues, this was consistent with good early repair tissue viability and maturation.
The findings supported the conventional MRI appearance and the patient’s clinical progress. Importantly, they were interpreted as one part of a combined assessment, rather than as a standalone test or definitive proof of histological regeneration.
What Did Second Look Arthroscopy Demonstrate?
As the patient subsequently sustained another knee injury that required further arthroscopy, the procedure also provided an opportunity to assess the previously treated cartilage repair site directly. The second look arthroscopy was therefore clinically indicated by the new injury and wasn’t performed solely for research or routine evaluation of cartilage healing.
During the procedure, the treated medial femoral condyle demonstrated good cartilage fill and smooth integration with the surrounding native cartilage. Arthroscopic probing showed that the repair tissue was firm, stable, and well-integrated. These observations were consistent with the earlier six-month MRI and T2RV assessment.
What This Case Shows About Whole Knee Cartilage Repair
This case demonstrates why a cartilage defect shouldn’t be considered in isolation. Meniscal deficiency, ligament instability, and malalignment can alter the forces acting across a repair site. In this patient, repairing the medial meniscus was therefore an important part of creating a more favourable mechanical environment for cartilage healing.
The outcome wasn’t based on cartilage treatment alone. The meniscus repair addressed the mechanical environment, while the scaffold-based procedure addressed the biological defect. Together, both formed part of the same joint preservation strategy.
This whole approach also shaped how the result was assessed. The patient’s return to competitive golf demonstrated meaningful improvement in symptoms and function, while MRI and T2RV mapping provided complementary information about the structure and early maturation of the repair tissue. These aspects of recovery answered different questions, which meant that neither should be interpreted alone.
At six months, the patient’s clinical recovery was supported by good defect filling, improved surface congruity, reduced bone marrow oedema, and T2RV measurements predominantly within the moderate 40 to 60 millisecond range. Later, second look arthroscopy performed because of a subsequent injury demonstrated firm, stable, and well-integrated repair tissue.
Even within the T2RV assessment, the pattern of the findings mattered. A single mean value might not fully describe a cartilage graft because distribution, uniformity, matrix continuity, edge integration, surface characteristics, and the underlying bone all contribute to interpretation. The 2024 study by Ow and colleagues supports this more comprehensive imaging approach.
However, this remains an individual clinical case. Outcomes vary according to patient factors, defect characteristics, meniscal status, alignment, ligament stability, rehabilitation, and duration of follow up. A good result at six months doesn’t establish lifetime durability, and longer-term review remains important.
The wider value of this case lies in showing how cartilage follow up can move beyond asking only whether a patient feels better. Quantitative imaging may add useful information about how repair tissue is maturing, provided that it’s interpreted carefully alongside conventional MRI and the complete clinical picture.
Note: This article describes an anonymised individual clinical case for educational purposes. Outcomes after cartilage and meniscus surgery vary, and the result described here shouldn’t be interpreted as a guarantee of outcome for another patient.
Assessing Knee Cartilage Injuries Before Returning to Sport
When persistent knee pain, swelling, or difficulty with rotational movement begins to interfere with the playing of sports, a specialist assessment can help identify what’s causing the symptoms and whether the cartilage, meniscus, or other structures are affected. As this case demonstrates, any cartilage defect should also be assessed alongside factors such as alignment, ligament stability, and the wider mechanical environment, particularly when planning treatment and a return to activity. At Oxford Cartilage & Sports Centre, symptoms, examination findings, imaging, and sporting goals are reviewed as a whole before the best options are recommended for the individual condition. To arrange a consultation with Dr Francis Wong, please contact the clinic to book an appointment.
References:
- Ow ZGW, Wong KL, et al. Single-stage arthroscopic cartilage repair with chondrectomy and implantation of a templated collagen membrane scaffold. Arthroscopy Techniques. 2023. https://pmc.ncbi.nlm.nih.gov/articles/PMC10714417/
- Gobbi A, Karnatzikos G, Scotti C, et al. One-step cartilage repair with bone marrow aspirate concentrated cells and collagen matrix in full-thickness knee cartilage lesions. Cartilage. 2011. https://pmc.ncbi.nlm.nih.gov/articles/PMC4300809/
- Ow ZGW, Wang D, Zhang EJX, Abd Razak HRB, Wong SBS, Ho JXM, Wong KL. Assessing acellular scaffold viability with T2-weighted relaxation time value imaging: imaging variables and early clinical associations at 6 months following patellofemoral cartilage repair. Journal of Cartilage & Joint Preservation. 2024;4(2):100185. doi:10.1016/j.jcjp.2024.100185.
- Welsch GH, Mamisch TC, Weber M, et al. T2 and T2* mapping in patients after matrix-associated autologous chondrocyte transplantation of the knee. European Radiology. 2010. PMID: 19937329.
- Welsch GH, Mamisch TC, Zak L, et al. Evaluation of cartilage repair tissue after matrix-associated autologous chondrocyte transplantation using morphological MRI and biochemical T2 mapping. American Journal of Sports Medicine. 2010. PMID: 20335510.
- Shinohara M, et al. Time-dependent change in cartilage repair tissue evaluated by quantitative T2 mapping after matrix-associated autologous chondrocyte transplantation. 2022. https://pmc.ncbi.nlm.nih.gov/articles/PMC9277438/
